[Solved]-Question 3 Flow Control Trying Achieve Differ Congestion Control B Principle Possible Flow Q37200521

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Question 3 (a) What is flow control trying to achieve, and how does this differ from congestion control? (b) In principle, is it possible to have flow control with UDP? Explain your answer (c) TCP congestion control employs a variable congestion window CongWin that expands and contracts in response to network congestion. Suppose that initially CongWin-1 in units of the maximum segment size, and the threshold between slow start and conges- tion avoidance is 3 in the same units (i) Describe the increase in CongWin for the first 3 round trips between the client and the server, assuming no packet loss. Explicitly state when the congestion (ii) Suppose a packet loss is now detected. What is the corresponding sequence of (d) Shown in Fig. 1 is a configuration of four routers A, B, C and D, and four destination avoidance phase commences and why. events? networks w, x, y and z. The initial routing table for A is Destination Next router No. hops 2 4 (C) What is the purpose of a routing table? (ii) Suppose D sends the following advertisement to A: Destination Next router No. hops 3 2 What is the resulting routing tablefor A? Explain your calculations (ii) Suppose the link between routers B and C is broken. Describe the subsequent sequence of events according to the routing information protocol. You do not need to calculate any new routing tables. Figure 1: Figure for Question 3. The capital letters in circles denote routers, the lower-case letters at the ends of lines represent destination networks. Show transcribed image text Question 3 (a) What is flow control trying to achieve, and how does this differ from congestion control? (b) In principle, is it possible to have flow control with UDP? Explain your answer (c) TCP congestion control employs a variable congestion window CongWin that expands and contracts in response to network congestion. Suppose that initially CongWin-1 in units of the maximum segment size, and the threshold between slow start and conges- tion avoidance is 3 in the same units (i) Describe the increase in CongWin for the first 3 round trips between the client and the server, assuming no packet loss. Explicitly state when the congestion (ii) Suppose a packet loss is now detected. What is the corresponding sequence of (d) Shown in Fig. 1 is a configuration of four routers A, B, C and D, and four destination avoidance phase commences and why. events? networks w, x, y and z. The initial routing table for A is Destination Next router No. hops 2 4 (C) What is the purpose of a routing table? (ii) Suppose D sends the following advertisement to A: Destination Next router No. hops 3 2 What is the resulting routing tablefor A? Explain your calculations (ii) Suppose the link between routers B and C is broken. Describe the subsequent sequence of events according to the routing information protocol. You do not need to calculate any new routing tables.
Figure 1: Figure for Question 3. The capital letters in circles denote routers, the lower-case letters at the ends of lines represent destination networks.

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