CHAPTER 4

1: What is true about the client-server model of services? Choose all that apply.
  1. RPC-based services also work in client-server model.

  2. A computer may act as a client or a server at one time, but not both.

  3. Multiple services may run on the same host simultaneously.

  4. Client-server-based utilities use only the TCP protocol.

A1: A, C. Answer B is not correct because a computer may act as a client, as a server, or both at the same time. Answer D is incorrect because client-server utilities may use other protocols also.
2: Port numbers are used in which layer of the OSI model?
  1. Network layer

  2. Transport layer

  3. Application layer

  4. Physical layer

A2: B.
3: Which port number is used by Telnet?
  1. 25

  2. 23

  3. 21

  4. 110

A3: B.
4: Which statement is true about a socket? ...

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