Computer and Data Communications Semester Mohd Nazri Mahmud Session 2a-27 Feb 2012

 Preparatory readings for Session 2a – First part  Read textbook 1, Chapter 2  Students with no background are advised to read the whole of Ch 2  Prepare for group open book quiz  Quiz will focus on Section 2.3 Layers and 2.4 The TCP/IP protocol suite  Preparatory reading for Session 2a – Second part  Read textbook Chapter 12: 12.1 Random Access, Chapter 13: Ethernet focus on 13.1 MAC Frames  Read Preparatory notes for Interconnecting LANs  Attempt preparatory questions  Prepare for participation in class

 Objective: To review the basics of TCP/IP layer as a refresher for students with background and as a quick catch-up for those without background  Rules  Questions will be displayed one by one on the screen  All groups must answer all questions one by one by writing their answers on a piece of paper  The lecture will read the questions and announce the duration given for the groups to discuss and arrive at their agreed choice of answer  When the duration is over, the lecturer will immediately proceed to the next question. There will be no repeat display of any question  At the end of the quiz, the group leaders will take their group answers and write them on the white-board  The lecturer will discuss the answers to each questions and marks will be given to each groups accordingly  The group with the highest mark wins  Points are carried forward to the next quiz.

Q1: State the 5 layers of TCP/IP protocol suite (60 seconds)

Q2: What is the responsibility of the Data-link Layer A: Source-to-destination data delivery B: Process-to-process data delivery C: Application-to-application data delivery D: Node-to-Node data delivery E: Link-to-Link data delivery 30 seconds

Q3:Which one is NOT the function of the Data- Link Layer  Provides flow control function  Provides error control capability  Controlling access to the communication medium  Dividing the source data into frames  Specify the number of bits to be sent in one second 45 seconds

Q4: Identify the appropriate terms for a data unit in each layer 4.1 Physical Layer 4.2 Data-Link Layer 4.3 Network Layer 4.4 Transport Layer Select your answers from the choices below A: datagram B: segment C: frame D: bits 90 seconds

Q5: The responsibility of the network layer A: Process-to-process data delivery B: Application-to-application data delivery C: Source-to-destination data delivery across multiple networks D: Node-to-Node data delivery E: Link-to-Link data delivery 30 seconds

Q6: How does the Network Layer ensure data sent by a source station is delivered to the correct destination? A: The Network Layer relies solely on the header inserted by the higher layers (application and transport layers). B: The Network Layer in the destination station announces to the network that it is the right receiver C: The Network Layer of the sending station adds to a header to the data segment. The header includes the IP addresses of the sender and the receiver. D: The Network Layers in the intermediate nodes (routers) specify the destination without the need for the Source station to tell them where to deliver the data segment. 120 seconds

Q7: Which statement is NOT true about the Internetworking Protocol (IP) A: Is a connectionless protocol B: Best effort delivery service C: Is a reliable protocol D: Provides no error correction E: Delivers datagram not in their original sequence 60 seconds

Q8: Which 2 statements are TRUE for the datagrams processed by the network layer protocol A: Datagrams are checked for errors and corrupted datagrams are corrected B: Datagrams can travel through different routes inside the interconnection of multiple networks C: Datagrams may arrive out of sequence at the destination D: All datagrams that belong to the same source will follow the same path through the networks to reach the destination 120 seconds

Q9: Which TWO statements are TRUE about the TCP protocol A: Ensure data delivered in sequence and free from error B: A connectionless protocol C: Is not a reliable protocol D: A connection-oriented protocol END OF QUIZ 120 seconds

Q1: State the 5 layers of TCP/IP protocol suite 1.PHY 2.DLL 3.NETW 4.TRANSPORT 5.APPLICATION (60 seconds)

Q2: What is the responsibility of the Data-link Layer A: Source-to-destination data delivery B: Process-to-process data delivery C: Application-to-application data delivery D: Node-to-Node data delivery E: Link-to-Link data delivery 30 seconds

Q3:Which one is NOT the function of the Data- Link Layer A. Provides flow control function B. Provides error control capability C. Controlling access to the communication medium D. Dividing the source data into frames E. Specify the number of bits to be sent in one second 45 seconds

Q4: Identify the appropriate terms for a data unit in each layer 4.1Physical Layer D 4.2 Data-Link Layer C 4.3 Network Layer A 4.4 Transport Layer B Select your answers from the choices below A: datagram B: segment C: frame D: bits 90 seconds

Q5: The responsibility of the network layer A: Process-to-process data delivery B: Application-to-application data delivery D: Node-to-No C: Source-to-destination data delivery across multiple networks de data delivery E: Link-to-Link data delivery 30 seconds

Q6: How does the Network Layer ensure data sent by a source station is delivered to the correct destination? A: The Network Layer relies solely on the header inserted by the higher layers (application and transport layers). B: The Network Layer in the destination station announces to the network that it is the right receiver C: The Network Layer of the sending station adds to a header to the data segment. The header includes the IP addresses of the sender and the receiver. D: The Network Layers in the intermediate nodes (routers) specify the destination without the need for the Source station to tell them where to deliver the data segment. 120 seconds

Q7: Which statement is NOT true about the Internetworking Protocol (IP) A: Is a connectionless protocol B: Best effort delivery service C: Is a reliable protocol D: Provides no error correction E: Delivers datagram not in their original sequence 60 seconds

Q8: Which 2 statements are TRUE for the datagrams processed by the network layer protocol A: Datagrams are checked for errors and corrupted datagrams are corrected B: Datagrams can travel through different routes inside the interconnection of multiple networks C: Datagrams may arrive out of sequence at the destination D: All datagrams that belong to the same source will follow the same path through the networks to reach the destination 120 seconds

Q9: Which TWO statements are TRUE about the TCP protocol A: Ensure data delivered in sequence and free from error B: A connectionless protocol C: Is not a reliable protocol D: A connection-oriented protocol END OF QUIZ 120 seconds

 Preparatory reading for Session 2a – Second part  Read textbook Chapter 12: 12.1 Random Access, Chapter 13: Ethernet - focus on 13.1 MAC Frames  Read Preparatory notes for Interconnecting LANs  Attempt preparatory questions  Prepare for participation in class

λ is a positive real number, equal to the expected number of occurrences during the given interval. For instance, if the events occur on average 4 times per minute, and one is interested in the probability of an event occurring k times in a 10 minute interval, one would use a Poisson distribution as the model with λ = 10×4 = 40.

describes the time between events in a Poisson process