Electrical Engineering 122 - Spring 2000 - Sengupta - Midterm 1

Electrical Engineering 122 - Spring 2000 - Sengupta - Midterm 1

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EE122 Midterm 1 Spring 2000 EECS 122: Introduction to Communications Networks Midterm 1 Solutions (50 points) Wednesday March 1, 2000 Professor Sengupta Problem 1. Multiple choice questions. Circle the answer that is the most correct. 1.1 (1 point) If you were building a network for sources that generate point-to-point traffic at a steady rate of 64 kbps you would build a 1. a circuit switched network 2. a packet switched network 3. a broadcast network 4. none of the above 1.2 (1 point) To maximize the pipelining gain in a packet switched network the ideal packet size 1. is as large as the data chunks generated by the applications 2. depends on the size of the protocol headers 3. is as small as one bit ideally 4. is none of the above 1.3 (1 point) Statistical multiplexing gain is observed when 1. the users of a network transmit only a small fraction of the time they are connected 2. the users of a network transmit all the time they are connected at their peak rate 3. when the users of the network send e-mail 4. none of the above 1.4 (1 point) When two packets from two hosts arrive simultaneously at an ethernet hub 1. both packets are recieved correctly 2. one packet is recieved correctly 3. the outcome is exactly like a switched ethernet 4. none of the above 1.5 (1 point) If a system administrator replaces an ethernet hub with an ethernet switch 1. all of the hosts on the ethernet must replace their NIC's 2. some of the hosts on the ethernet must replace their NIC's file:///C|/Documents%20and%20Settings/Jason%20Raft. ..-%20Spring%202000%20-%20Sengupta%20-%20Mid%201.htm (1 of 6)1/27/2007 3:55:03 PM
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EE122 Midterm 1 Spring 2000 3. none of the hosts on the ethernet must replace their NIC's 4. none of the above 1.6 (1 point) The best local area network for hosts that need to send traffic at regular intervals of time is 1. an ethernet 2. a token ring 3. slotted aloha 4. none of the above 1.7 (1 point) An FDDI ring guarantees that each host will receive the token within 1. 2TTRT of releasing the token 2. 0.5TTRT of releasing the token 3. no defined time limit 4. none of the above 1.8 (1 point) Ethernets are popular with system administrators because 1. they are simple to install, easy to maintain, and provide satisfactory delay and throughput to hosts 2. they provide deterministic access latencies to hosts 3. they provide special provisions for synchronous and asynchronous traffic 4. none of the above 1.9 (1 point) The information required by an IP protocol when handling an IP packet is contained in the 1. ethernet header 2. IP header 3. a separate ICMP message 4. none of the above 1.10 (1 point) When a DNS lookup is forwarded to the domain name server of the destination the reply
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Electrical Engineering 122 - Spring 2000 - Sengupta - Midterm 1

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