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CHAPTER 2
Network Models
Solutions to Odd-Numbered Review Questions and Exercises
Review Questions
1. The Internet model, as discussed in this chapter, include physical, data link, net-
work, transport, and application layers.
3. The application layer supports the user.
5. Peer-to-peer processes are processes on two or more devices communicating at a
same layer
7. Headers and trailers are control data added at the beginning and the end of each
data unit at each layer of the sender and removed at the corresponding layers of the
receiver. They provide source and destination addresses, synchronization points,
information for error detection, etc.
9. The data link layer is responsible for
a. framing data bits
b. providing the physical addresses of the sender/receiver
c. data rate control
d. detection and correction of damaged and lost frames
11. The transport layer oversees the process-to-process delivery of the entire message.
It is responsible for
a. dividing the message into manageable segments
b. reassembling it at the destination
c. flow and error control
13. The application layer services include file transfer, remote access, shared data-
base management, and mail services.
Exercises
15. The International Standards Organization, or the International Organization of
Standards, (ISO) is a multinational body dedicated to worldwide agreement on
international standards. An ISO standard that covers all aspects of network com-
munications is the Open Systems Interconnection (OSI) model.
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