1 NETWORKING TECHNOLOGIES (II) BUS3500 - Abdou Illia, Fall 2008 (November 4, 2008)

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Presentation transcript:

1 NETWORKING TECHNOLOGIES (II) BUS Abdou Illia, Fall 2008 (November 4, 2008)

2 LEARNING GOALS  Describe networking protocols  Identify the major protocols used in corporate networks.

3 Protocols  An agreed upon set of rules that govern communication in a network  All computers on a network must use same protocol for effective communication  Example of protocols:  TCP/IP suite  Ethernet  Token Ring Computer 1 Rules for Task 1 Rules for Task 2 Rules for Task 3 Rules for Task 4 Rules for Task 5 Computer 2 Rules for Task 1 Rules for Task 2 Rules for Task 3 Rules for Task 4 Rules for Task 5

4 TCP/IP  TCP/IP suite is named after its two main protocols: TCP and IP  Transmission Control Protocol (TCP) Provides a reliable data transfer service between two endpoints on a network  Internet Protocol (IP) Defines a delivery mechanism for packets of data sent between all systems on an Internet  It’s the protocol suite for the Internet TaskSample rules/protocols ApplicationHTTP, FTP, SMTP TransportTCP, UDP InternetIP PhysicalEthernet, Token Ring, PPP, Modem standards

5 Ethernet  A set of rules for transmitting messages in LANs  Most widely used protocol for LANs  Uses a method called CSMA/CD* for wired LANs  CSMA/CD helps determine priority between potential senders  CSMA/CD helps in dealing with collisions 1) All computers (“carriers”) listen (“sense”) for traffic on the LAN 2) If no traffic, computer that wishes to transmit may transmit 3) If collision occurs, computers must wait a random amount of time 4) The computer with smallest random number send again first. * Carrier Sense Multiple Access with Collision Detection CSMA/CD*

6 Ethernet standards 10Base-T Speed: 10 Mbps Signal type: Baseband transmission Medium: Twisted Pair - Speed: 100 Mbps - Signal type: Baseband - Distance: 100 m between Hub/Switch and node - Uses CAT5 or better UTP with RJ-45 connectors - Star topology: physical star, logical bus 100Base-TX 100Base-TX: Two Twisted-pairs of Category 5 UTP or STP 100Base-FX: Fiber-optic cabling using 2-strand cable 100Base-T4: Four Twisted-pairs of Category 3,4, or 5 UTP 1000Base-CX: Uses Twinaxial cable 1000Base-LX: Uses single-mode Fiber-optic cable (5 km) 1000Base-T: 4 Twisted-pairs of Cat. 5 UTP in full-duplex CSMA/CD Ethernet 10Base-2 10Base-5 10Base-T 10Broad u Fast Ethernet 100Base-TX 100Base-FX 100Base-T z Gigabit Ethernet 1000Base-SX 1000Base-LX 1000Base-CX + New 10Gbps standard

7 Token Ring  Other set of rules for transmitting messages in LANs  Only one node “talks” at a time  A node only transmits when it receives a special packet called a “Token”  Only one Token on the ring  No collisions

8 Summary Questions BookNotes 1)(a) What is a protocol? (b) Name few protocols used in network. 2) Could collisions occur in: (a) Ethernet LANs? (b) Token Ring LANs? 3)(a) What is the maximum speed in a 100BaseTX Ethernet LAN? (b) What kind of transmission media it uses? 4)Is Token Ring widely used?

9

10 Problem  Four students share a dorm. They would like to set up a network in order to share programs and data files. Three of the students own PCs and the fourth student has a laptop computer. a)What computing equipments they need to buy in order to set up the network with a star topology? b)Suppose that they decided to set up a P2P wired network. They have purchased a 10/100BASE-TX 4-port Ethernet hub at What kind of physical media they need to buy?