Question

Tig. 1 2. Consider the scenario shown below where (from the bottom up), you notice three hosts and a local logging server (that stores information that is sent to it) are connected to a router and to each other by a 100 Mbps link, with a near-zero ms propagation delay. That router in turn is connected to another router over a 30 Mbps link with a 50 ms propagation delay, and that latter router is connected to two remote logging servers, each over a 20 Mbps link with aloms propagation delay. 20 Mbps 10 ms prop delay 30 Mbps 50 ms prop. delay 100Mbps oms prop delay Fig. 2 Suppose a host sends a logging message directly to one of the remote logging servers. The logging message is 5K bits long. What is the end-to-end delay from when the logging message is first transmitted by the host to when it is received at the remote server? Assume that the request goes directly to the server, that there are no queueing delays, and that node (router) packet-processing delays are also zero. Assume that each of the three hosts generate logging messages at the same rate; each host is equally like to send a logging message to either of the two remote servers. No traffic is directed to the local logging server. What is the maximum rate at which the clients can send logging messages to the remote servers?

Answer 1

given, logging message Bs 5K bits long. as Given, logging message - Over 20 mbps link it will take → 20 Mbps 5K bits sy 5x103 bits 20x1063 bits sec -0.00025 sec Over 30 Mbps link, 5K bits ) it will take 30 Mbps => 5x10 sec - 30x106 = 0.000167 sec Over 100 Mbps link, it will take + 5K bits tоо мьps - 5x103 sec 100x106 → 0.00005 sec Transmission delay -> 0.000 25 +0.000167 + 0.00005 The total transmission delay => 0 +0.000467 sec The total b yo pagation delay = 10+ 50 Scanned with CamScanner = 60 msec.

. End-to-end delay => 0.000467 +0:06 = 0.060467 sec. by the link between 2 gouter is allowing 30 Mbps to be delivered. 15 Mbps j.e., to be delivered to each server. We have given, that logging message = 5K bits. Maximum rare). 15 Mbps БК Бts => 15x106 5x 3 free → 3K logging messages per second. Scanned with CamScanner