Q # 1 If all links in the internet were to provide reliable delivery service, wo
ID: 3872376 • Letter: Q
Question
Q # 1 If all links in the internet were to provide reliable delivery service, would the TCP reliable delivery service be redundant? Why or why not? Q # 2 Describe polling and token-passing protocols using the analogy of cocktail party interactions? Q # 3 Suppose the information content of a packet is the bit pattern parity scheme is being used. What would the value of the field containing the parity bits be for the case of a two-dimensional parity scheme? Your answer should be such that a minimum-length checksunm field is used 000 and an even Q # 4 Suppose three active nodes (nodes A, B and C) are competing for access to a channel using slotted ALOHA. Assume each node has an infinite number of packets to send. Each node attempts to transmit in each slot with probability p. The first slot is numbered slot 1, the second slot is numbered slot 2, and so on a. What is the probability that a node A succeeds for the first time in slot 4? b. What is the probability that some node (either A.B, or C) succeeds in slot 2? c. What is the probability that the first success occurs in slot 4? d. What is the efficiency of this three-node system?
Explanation / Answer
No, it is unable to be redundant since the TCP additionally offers sequencing utilizing the similar mechanisms. Though IP datagram sent over the link will be received at the other end of the link without errors, it is not guaranteed that IP datagrams will arrive at the ultimate destination in the proper order. With IP, datagrams emerging from the same TCP connection can take different routes in the network, and therefore arrive in different order. TCP is still needed to provide the receiving end of the application the byte stream in the correct order. Also, IP can lose packets due to routing loops or equipment failures.
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