1. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-1 Day 2 - Network Traffic, Protocols and Packet Switching Traffic Source Scheduling Transport Protocols Node Parameters Subnetworks & Transit Networks Exercise 2 - Interconnection of Networks

2. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-2 Network Traffic Sources

3. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-3 Traffic Source Characteristics Message Source: –Datagram or connectionless model of data transport Session Source: –Virtual circuit or connection-oriented mode of data transport Response Source: –Response messages to Message or Session Sources Traffic Sources are scheduled by either: –Iteration time –Received message(s) –Triggering event Every simulation must have at least one time based Traffic Source in it!

4. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-4 Message Source Scheduling

5. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-5 Response Source Scheduling

6. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-6 Session Source Scheduling

7. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-7 Time Based Source Scheduling Iteration Time –time from beginning of one execution to the next scheduled iteration –may be periodic or statistical First Arrival –time the first execution is scheduled –may be a constant or statistical distribution –default of none implies a random start time – uniformly distributed between 0 and a random variate determined by iteration distribution Last Arrival –default is none, which means Source runs until the end of the simulation –stops scheduling, not execution

8. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-8 Message Based Source Scheduling Traffic Source is activated when the Received Message List is satisfied The Received Message List contains one or more message texts The Source will automatically “read” its received message(s) when it starts Attributes of first message in list (often referred to as the “original message”) can be used by the Source for determining its own properties Attributes of the “original message” –Source of original message –Size of original message –Text of original message

9. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-9 Edit Received Message List

10. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-10 Edit Required Message Text

11. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-11 Select Required Message Text

12. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-12 Received Message List

13. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-13 Wildcards Uses the “*” character to add additional flexibility in scheduling Sources based on Received Message Texts May be used: –alone ( “*” ) matches everything –at the beginning of text ( *Request ) matches everything that ends in the given text –at the end of text ( Request* ) matches everything that begins with the given text –at both the beginning and end of text ( *Request* ) matches any name that in any part contains the given text This makes the Source sensitive to certain categories of messages only Different Sources on the same Node may be scheduled by different categories of messages

14. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-14 Wildcard Examples MatchesDoes not Match Request A*Request A1Request B1 Request ANYTHINGRequestA5 Request AREQUEST A5 *Request AMY Request ARequest A1 Request AREQUEST ABCD *Request A*MY Request A5MY RequestA5 Request AREQUEST A23 NOTE: Leading and trailing spaces are ignored ( e.g. * Request A * )

15. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-15 Edit Required Message

16. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-16 Enter Required Message Text with Wildcard

17. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-17 Source Scheduled by Wildcard Message Text

18. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-18 Received Message Delay

19. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-19 “ECHO” Messages

20. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-20 “ECHO” Messages (continued)

21. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-21 Triggering Event Scheduling

22. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-22 Triggering Event Reference Model

23. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-23 Node Triggers

24. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-24 Select Advanced Tab

25. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-25 Node Triggered Sources

26. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-26 Triggered Source List

27. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-27 Triggered Source Selections

28. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-28 Multiple Selection in a List Box

29. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-29 Edit Triggered Source

30. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-30 Node Triggering Rules

31. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-31 Select Delay Tab

32. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-32 Triggering Delay

33. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-33 Close Triggering Detail

34. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-34 Link Triggers

35. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-35 Link Triggering Rules

36. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-36 Edit Session Source Properties

37. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-37 Session Source Properties

38. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-38 Session Source Triggers

39. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-39 Triggered Source List

40. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-40 Triggered Source Selections

41. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-41 Multiple Selection in a List Box

42. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-42 Edit Triggered Source

43. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-43 Session Source Triggering Rules

44. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-44 Triggering Delay

45. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-45 Close Triggering Detail

46. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-46 Weighted List of Triggered Sources

47. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-47 Edit Triggered Source

48. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-48 Enter Probability of Triggered Source

49. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-49 Probabilities Must Sum to 1.0

50. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-50 Packet Switched Operation of Enterprise Wide Networks WAN

51. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-51 Connectionless Network Operation Packet switching technique using datagrams (e.g. DECNET) Datagrams are independently routed packets generated by –Message sources –Session sources –Response sources Datagrams from the same message may follow different routes and arrive out of order Packet sequencing and error handling are the responsibility of the end systems Data Packets –Datagram Acknowledgment Packets –Flow control –Error control

52. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-52 Packet switching technique analogous to public telephone network (e.g., SNA) Virtual Circuits are established by Session Setup packets During data transfer, all packets follow a predetermined route Multiple virtual circuits can have links and/or nodes in common Data Packets –Session information packet Control Packets –Session setup packet –Session confirm packet –Acknowledgment packet - Session operation Flow control Error control Connection Oriented Network Operation

53. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-53 Circuit Switching DATA TRANSMISSION TIME SOURCENODE 1NODE 2DESTINATION SWITCHING DELAY PROPAGATION DELAY TIME CALL SETUP DELAY Call Request Call Connected Data Message A Dedicated end-to-end channel between communicating parties Connection setup required Well-suited for delay-sensitive traffic with long holding times (e.g., voice)

54. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-54 Message Switching Store-and-forward from source to destination No dedicated end-to-end channels Store-and-forward and queuing delays

55. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-55 Packet Switching Message switching with an upper limit on the length of transmitted blocks of data Pipelining reduces store-and-forward delay Packets may take different routes

56. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-56 Fast Packet Switching SOURCENODE 1NODE 2DESTINATION TIME PACKET OVERHEAD PACKET PROCESSING TIME Packet switching with virtual cut-thru As the packet overhead and processing times shrink to zero, fast-packet switching begins to approach circuit switching

57. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-57 Define Protocol Parameter Sets

58. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-58 Edit Transport Protocols

59. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-59 Copy a Library Selection or Add a New Protocol

60. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-60 Edit Transport Protocol

61. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-61 Transport Protocol Parameters

62. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-62 Packet Parameters Name –Used to apply transport protocol to Traffic Sources Data bytes –Datagram or Session information packet size before overhead is added –Size of packet transmitted from end-to-end Pad to fill packets –Always transmit full sized packets (I.e. fractional packets are padded) –Specifically designed for modeling ATM which has fixed size cells –Can be applied to the enhanced flow control methods and “None” Overhead bytes –Protocol overhead added to packet size –Overhead remains with packet from end-to-end

63. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-63 Packet Parameters (continued) Protocol ID –Identifier used for processing times at packet switches –I.e. Processing times at packet switches are a function of the Protocol ID Acknowledgments –Size and priority of acknowledgment packet for both flow control and error control

64. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-64 Protocol ID

65. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-65 User-defined Protocol ID

66. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-66 Error Control

67. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-67 Error Control Parameters Retransmit blocked packets –Check box to specify whether or not to retransmit blocked packets –Automatically turned on without option of turning it off for all flow control methods except “None” Model error control ack –Modeling an error control acknowledgment packet is optional –Models additional traffic acknowledging receipt of packet –Also permits modeling acknowledgments when there is no flow control window Retransmission time (milliseconds) –Timer for retransmission of blocked packets –Timer starts when packet is transmitted

68. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-68 Flow Control

69. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-69 Flow Control Parameters Window packets (I.e. Window size) –Used for flow control –After a fixed number of packets related to window size have been transmitted, must wait for an acknowledgment before resuming transmission Flow Control Window –Handshaking mechanism to regulate the flow of traffic between end systems (I.e. source to destination) –Enhanced Flow Control Windowing methods have parameter sets

70. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-70 Flow Control Windowing Methods

71. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-71 Basic Flow Control Sliding Window –Limit the number of in-transit packets to the window size –Acknowledge each packet Fixed Window –Transmit a window of packets –Stop and wait for acknowledgment SNA Pacing –Initialize a pacing counter to the window size –Decrement the counter by 1 after each packet is transmitted –Increment the counter by the window size whenever an acknowledgment is received –Transmit only when the pacing counter is positive –Acknowledge only the first packet in a window None –Transmit packets without flow control

72. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-72 Enhanced Flow Control Enhanced Flow Control used for lossy networks –Enhanced to include receipt of duplicate packets –Provides more retransmission options Sliding window (Enhanced) and TCP/IP window –Allows go-back-N for error control –Options to delay acknowledgments at receiver –Adjust timeout by round-trip time and multiple transmissions –TCP/IP window includes the congestion window algorithm Fixed window (Enhanced) and SNA pacing (Enhanced) –Allows go-back-N for error control

73. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-73 Rate Control Parameters

74. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-74 Rate Control (continued) Policing –Mechanism for monitoring burst sizes over an interval to determine whether or not transmission exceeds burst contract Rate Control –Regulates the number of packets transmitted in order to prevent exceeding burst contract

75. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-75 Rate Control Methods

76. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-76 Traffic Policing Methods

77. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-77 Open/Close Sequence Parameters

78. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-78 Accept Transport Protocol Parameters

79. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-79 Close Transport Protocol List

80. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-80 Close Protocol Parameter Sets

81. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-81 Edit Traffic Source

82. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-82 Select Packets Tab

83. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-83 Network Operation Parameters Transport Protocol –Packet sizes and traffic constraints for messages Packetize –Time to form a packet from this source Priority –Priority of packets from this source Routing Class –Class of traffic used in routing protocols Network Service Level –Maps to data-link or lower-layers services Apply to all Packet Switched Traffic Sources

84. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-84 Select Transport Protocol

85. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-85 Edit Transport Protocols

86. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-86 Add, Edit, Remove Transport Protocols

87. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-87 Transport Protocols Apply to All Sources of Messages

88. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-88 Packet Switching Nodes

89. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-89 Processing Node Architecture Propagation Delay Application Source Queue Local Storage for Files PE Processing Elements Input Queuing Delay Packet Processing Delay Output Queuing Delay Outgoing Packets Incoming Packets Transmission Delay

90. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-90 Edit Processing Node Parameters

91. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-91 Add a Processing Node Parameter Set

92. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-92 New Processing Node Parameter Set

93. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-93 Packet Forwarding Parameters Protocol dependent packet processing times (milliseconds) –protocol dependent time to process a packet regardless of size Additional Processing/KByte (milliseconds) –size dependent time to process a packet –e.g. Time/Packet = (Processing Time/Kilobyte) * (Packet Size in Kilobytes) Packet processing uses processor –Off: Without utilization, models non-blocking switching fabrics (I.e. Option to delay without utilizing the processor –On: With utilization, tasks have to wait for processor Processing for session setup (milliseconds) –time to process a session source setup packet –typically used for virtual circuit establishment Session Limit –limits the number of sessions that can use the node

94. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-94 Edit Protocol Dependent Packet Processing Times

95. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-95 Add Packet Processing Time

96. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-96 Packet Processing Time Parameters

97. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-97 Select Routed Protocol ID

98. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-98 Packet Processing Time for Routed Protocol ID

99. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-99 Processing Node Packet Processing Times

100. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-100 Source or Sink Only vs. Virtual Cut-through Nodes

101. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-101 Source or Sink Only vs. Virtual Cut-through Nodes (continued) Source or sink only –Traffic can originate and/or terminate only –Incoming traffic can not be routed to an outgoing link –“Source or Sink only” specification serves as a constraint in the shortest path routing calculations –Group Nodes are always “Source or sink only” –Switch and Router nodes are never “Source or sink only” Virtual cut-through –Cut-through nodes forward packets before the entire packet is received –Traffic can not originate or terminate at a cut-through node –Typically applies to a Switch node –Node may connect only to Point-to-point links of the same speed

102. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-102 Node Processor(s) Parameters

103. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-103 Node Processor(s) Parameters (continued) Number of processors –Number of processing elements in node Application Processing –Processing Time Per Cycle (microseconds) Used to determine the duration of various kinds of processing e.g. Time/Process = (Processing Time/Cycle) * (Cycles/Process) Selection rules –Between applications –Between applications and packets –Between packet buffers

104. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-104 Computer Group

105. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-105 Computer Group Architecture Transmission Delay Propagation Delay Input Queuing Delay Packet Processing Delay Output Queuing Delay Outgoing Packets from SourceIncoming Packets to Destination Application Source Queue Local Storage for Files PE Processing Elements

106. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-106 Computer Group Parameters

107. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-107 Add Computer Group Parameter Set

108. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-108 Number in Group

109. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-109 Network Device

110. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-110 Network Device Architecture Bus N Bus 1 Processing Elements Local Storage for Files Application Source Queue PE Input Queuing Delay Packet Routing Delay Output Queuing Delay Input Queuing Delay Output Queuing Delay Packet Routing Delay Internal Bus Delay

111. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-111 Edit Network Device Parameters

112. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-112 Copy a Library Selection or Add a New Parameter Set

113. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-113 Edit Network Device Parameter Set

114. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-114 Packet Forwarding Parameters

115. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-115 Network Device Bus Parameters

116. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-116 Link Port

117. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-117 Node Side Port Properties: Line Card ID

118. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-118 Edit Another Link Port

119. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-119 Line Card ID List

120. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-120 Network Device Port Processing Delays

121. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-121 Edit Network Device Parameter Set

122. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-122 Network Device Port Parameters

123. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-123 Edit Port Processing Times

124. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-124 Add Port Processing Time

125. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-125 Port Processing Time Parameters

126. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-126 Select Link Type

127. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-127 Select Routed Protocol ID

128. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-128 Input and Output Port Delays

129. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-129 Special Case Port Processing Times

130. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-130 Port Default Parameters

131. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-131 Node Buffer Parameters

132. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-132 Edit Port Detail

133. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-133 Port Buffer Parameters

134. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-134 Input Port Buffer Parameters

135. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-135 Buffer Ranking Methods

136. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-136 Buffer Policies

137. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-137 Buffer Policies (continued) Default –Packets arriving at a full buffer are blocked (I.e. a buffer without enough room for the arriving packet) Preemption –Packets arriving at a full buffer may preempt packets already there –Which packets to preempt may be based on priority or discard eligibility –Discard eligibility applies to frame relay and ATM Threshold –Packets arriving at a buffer that has exceeded a predetermined threshold may be dropped –Drop decision may be based on priority or discard eligibility

138. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-138 Port Processing Parameters

139. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-139 Open New Model

140. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-140 Select Model-1.c3

141. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-141 Save Model to a New File

142. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-142 New Filename for Model

143. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-143 Select All

144. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-144 Cut Selected Objects

145. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-145 Subnetworks

146. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-146 Resize Subnetwork

147. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-147 Resize Subnetwork (continued)

148. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-148 Edit Subnetwork Properties

149. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-149 Subnetwork Properties

150. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-150 Enter Subnetwork

151. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-151 Title Bar

152. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-152 Paste Local Clipboard Contents

153. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-153 Position Contents and Click

154. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-154 Deselect by Clicking on Background

155. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-155 Network Device

156. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-156 Place Network Device in Subnetwork and Edit Properties

157. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-157 Network Device Properties

158. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-158 Access Point

159. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-159 Place Access Point

160. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-160 Select Connection Tool

161. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-161 Connect Access Point and Leave Subnetwork

162. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-162 Clone Subnetwork

163. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-163 Number of Subnetwork Clones

164. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-164 Position Subnetworks

165. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-165 Select and Drag Access Point

166. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-166 Place Access Point

167. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-167 Token Passing Link

168. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-168 Resize Link and Edit Properties

169. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-169 Select Basic FDDI Link Type

170. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-170 Connect Subnetworks to FDDI Backbone

171. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-171 Transit Network Backbone

172. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-172 Enter Transit Network

173. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-173 Transit Network Topology

174. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-174 Exercise 2 - Interconnection of Networks Four regional offices are connected via the private packet switching network as shown below. Run this model for one replication of 3600 seconds with a 300 second warmup.

175. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-175 Exercise 2 - Regional Subnetwork The regional offices consist of 4 workstations (modeled as a computer group) and a router connected to a 10BASE5 Ethernet LAN

176. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-176 Exercise 2 - WAN Router Backbone The WAN Router Backbone consists of 56 Kbps access links to the routers which are connected to each other over T1 lines.

177. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-177 Exercise 2 - Topology Create a Computer Group parameter set with 4 computers in the group Create a Router parameter set that has the following characteristics: –packet processing time of 0.64 milliseconds per IPX packet –port processing times for input and output based on ability to process 1000 packets/second for all types of links (1000 packets per second = 1 ms/packet) –buffer size of 16000 bytes for both input and output Use the 56 Kbps library parameter set for the router backbone point-to-point access links and the T1 library parameter set for the point-to-point links connecting the routers to each other. The link from Router A to Router B fails for 1 minute after each minute of operation.

178. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-178 Exercise 2 - Network Traffic & Operation Change the destination of the E-Mail messages from Random Neighbor to Random List with all nodes except the routers in the list. (The routers will automatically route the traffic to its destination!) The Client Sessions continue to access the server only. All traffic sources have a user-defined Transport protocol specified as follows: –The maximum packet size is 1024 bytes of user data –The type of packet is IPX –The IPX packets also carry 50 bytes of overhead per packet –Fixed Window flow control is used with a window size of 128 –Flow control acknowledgments are 50 bytes

179. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-179 Multiple Select with Shift Key

180. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-180 Replace Processing Node with Computer Group

181. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-181 Copy Computer Group with Traffic Sources

182. —————————— CACI Products Company - http://www.caciasl.com ——————————————————— COMNET III —————————————— 2-182 This page is intentionally blank