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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Chapter 1's Review Questions

1: The Transport Layer is the host-to-host layer in the OSI model and the TCP/IP suite. It is in-between the upper and lower layers and depending on the protocol is responsible for delivery, error detection, and correction. Describe the upper layers of the OSI model and include examples.
A1: Answer: The upper layers of the OSI model include the following:
  • L7 ApplicationService use and advertisement (file and print services, e-mail)

  • L6 PresentationTranslation, encryption, and compression (character codes, public/private key, ASCII, JPEG)

  • L5 SessionDialog, session administration, connection establishment, and data transfer (NetBIOS, Sockets, drive mappings)

2: Describe the lower layers of the OSI model and include ...

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