Chapter 4

1. A and C. The network layer defines logical addressing, in contrast to physical addressing. The logical address structure allows easy grouping of addresses, which makes routing more efficient. Path selection refers to the process of choosing the best routes to use in the network. Physical addressing and arbitration typically are data link layer functions, and error recovery typically is a transport layer function.

2. C and E. Because PC1 and PC2 are separated by routers, the PCs must rely on the routers to use routing logic. With routing, the router discards the data link header of an incoming frame, making a decision of where to forward the packet deencapsulated from the frame. As a result, the largest entity that passes from PC1 ...

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