Integrated Services Digital Network by Regis Sbudd J. Bates

By Regis Sbudd J. Bates

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14. D. Stub networks have only one connection to an internetwork. Only default routes can be set on a stub network or network loops may occur. See Chapter 5 for more information. 15. B. A hub is a Physical layer device. See Chapter 1 for more information. 16. B. The command show controllers s 0 tells you what type of serial connection you have. If it is a DCE, you need to provide the clock rate. See Chapter 4 for more information. 17. C. The primary reason the OSI model was created was so that different networks could interoperate.

See Chapter 1 for more information. fm Page xxviii Wednesday, September 6, 2006 9:46 AM xxviii Answers to Assessment Test 18. C. The Transport layer creates virtual circuits between hosts before transmitting any data. See Chapter 1 for more information. 19. C. User Datagram Protocol is a connection network service at the Transport layer and DHCP uses this connectionless service. See Chapter 2 for more information. 20. D. The command used to copy a configuration from a router to a TFTP host is copy flash tftp.

How many collision domains do you see here? I’m counting 10—remember that connection between the switches is considered a collision domain! Should I Just Replace All My Hubs with Switches? You’re a network administrator at a large company in San Jose. The boss comes to you and says that he got your requisition to buy a switch and is not sure about approving the expense; do you really need it? Well, if you can, sure—why not? Switches really add a lot of functionality to a network that hubs just don’t have.

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