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A router, or layer-3 device, provides broadcast and multicast con- trol of a network. Please see Chapter 19 for more information. 37. C. Dynamic VLANs are created by an administrator on a special server and then assigned dynamically to ports on a switch when a host is attached. Please see Chapter 19 for more information. 38. C. An autonomous system between two other autonomous systems is referred to as a transit AS. Traffic from one autonomous system must traverse through a transit AS to get to another autonomous system.
If you need to add new routers to support additional workgroups, they should communicate through the distribution layer and thus be peers (instead of subordinates) to the other access layer routers. As already noted, having three separate levels does not have to imply the use of three separate routers. It could be fewer, or it could be more. Remember, this is a layered approach. In our case studies, we will look at scenarios in which the functionality of several layers is collapsed inside a single internetworking device.
A, B. BGP should be used when connecting multiple ISPs to an autonomous system or when multi-homing ISPs. See Chapter 9 for more information. 9. A. Backward explicit congestion notification (BECN) is sent against the flow of traffic. For a comparison of different WAN technologies, see Chapter 5. com lii Answers to Assessment Test 10. C. The router will choose the protocol with the lowest administrative distance. IGRP has the lowest administrative distance of 100. For more information, see Chapter 10.