Nt1210 Unit 7 Ass 1

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NT1210 5/12/15 Intro to Networking Unit 7 Assignment 1 Homework Questions 1. b. It uses a telco service called packet switching. 2. a. Switched analog circuits b. Dedicated digital circuits 3. c. Routers use Layer 3 and ignore Layers 1 and 2. d. Routers discard old data-link headers and insert new data-link headers as part of their logic, which treats each interface’s lower-layer details as independent from each other. 4. b. As a transport service to deliver IP packets to the next IP router 5. b. Star 6. c. 64 Kbps, 1.544 Mbps, and any speed in between d. No literal distance limitation 7. a. A patch cable with RJ-48 8. c. The switches map the T1 customer lines to one of 28 different frequencies in the T3 trunks. 9. c 28 10. b. Packet switching 11. b. The physical line between the telco CO and site B uses a line speed of 1.544 Mbps. 12. a. The CSU/DSU controls the router’s sending and receiving speeds using clocking. 13. a. Each frame has 193 bits. b. The frame holds 24 bits, one per channel, plus overhead. 14. a. HDLC 15. a. Flag d. FCS 16. b. The telco switch can queue the data waiting on the congested outgoing trunk to become available. c. The trunks between switches fit the bits into logical time channels on the trunk. 17. c. DTE 18. c. Must exist between two routers before the routers can send Frame Relay frames directly to each other 19. a. Not all routers can send a Frame Relay frame directly to each other. b. Frame Relay frames will be forwarded by the network based on the DLCI field in the Frame Relay header. 20. a. ATM b. MPLS Key Terms for Chapter 7 Switched circuit A circuit created by the phone company in reaction to signaling (the user tapping telephone keys or a modem sending in the same digits), with the telco tearing down the circuit when the user is

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