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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Appendix A. Answers to Review Questions

1:

What are the layers of the OSI model?

A1:

Answer: Application, presentation, session, transport, network, data link, physical. Remember the sentence “All people seem to need data processing.”

2:

Which layer determines path selection in an internetwork?

A2:

Answer: Layer 3, the network layer.

3:

What types of things are defined at the physical layer?

A3:

Answer: Voltage levels, time of voltage changes, physical data rates, maximum transmission distances, physical connectors, and type of media.

4:

What is one method of mapping network addresses to MAC addresses?

A4:

Answer: ARP, Hello, predictable.

5:

Which includes more overhead, connection-oriented or connectionless services?

A5:

Answer: Connection-oriented. ...

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