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Appendix A: Answers to Review Questions > Chapter 4: Network Management - Pg. 217

Chapter 4: Net work Management 2 17 T he SC connector uses a push-pull mechanism similar to com mon audio and video plugs. T he straight tip (ST) connector uses a half-t wist bayonet t ype of lock. 4. B , C . T he wireless standard 802 .11a is not compatible with 802 .11b. T he wireless stan- dards 802 .11g and n are compatible with 802 .11b. I n addition, the wireless standard 802 .11 n is compatible with 802 .11a. 802 .11y is not a current wireless standard. 5. B . A T1 provides for 24 64Kbps channels for a total of 1. 54 4Mbps bandwidth. A T3 provides for 672 channels or an equivalent of 28 T1s. A n OC3 provides for 150Mbps. A n E1 provides 32 channels for a total of 2 .048Mbps bandwidth. 6. C . T he AT M technolog y uses fixed-leng th cells of 53 by tes. Frame Relay is packet- switching technolog y used by companies to save money vs. having dedicated lines. DSL is a technolog y that uses telephone lines for I nternet com munication. Ethernet uses variable leng th frames, not fixed-leng th cells. 7. A . M PL S is a mechanism used to create a logical net work topolog y with no depen- dence on the underlying protocol. I nstead, it uses labels to make frame for warding decisions, giving the net work designer a wide range of f lexibilit y. Point to point, ring, and mesh topologies do not use labels. 8. C . I f you chose to create a full mesh, it would take [n(n ­ 1)]/2 connections. T his works out to [5(5 ­ 1)]/2 = 10. To clarif y, this would be 20 connectors and 10 connections, and each computer would need to contain 4 net work interface cards. 9. A . I f you have T X and R X reversed on a connection because of an improper instal- lation of a wall jack or patch panel or because of the wrong t ype of cable being used, then the result will be a total lack of connectivit y, not a par tial or intermit tent one. 10. B. The point at which the control and ownership changes from your company to the service provider network is referred to as the demarc or demarcation point. The I DF is a rack that holds communications lines and is located in the equipment or telecommunica- tions room. The M DF is a reference point generally used for telephone lines. A CSU/ DSU is a device used to connect a router to a digital circuit, such as a T1 or T3 line. Chapter 4: Net work Management 1. C , D. Routers and switches are considered network devices since they are core compo- nents of a network with varied uses. Network appliances are devices such as load balanc- ers, and content filters are specialized devices that perform a specifically defined function. 2. A . A but t set is a legacy tool still used by telephone technicians to test and com muni- cate on standard telephone lines. A crimper is used to create net work cables. A toner