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Chapter Review

  1. In TCP, what does "delayed acknowledgment" mean?
    1. A predetermined time interval must pass before the receiving system can acknowledge a data packet.
    2. Data segments are not acknowledged until the entire sequence has been transmitted.
    3. The receiving system doesn't have to generate a separate acknowledgment message for every segment.
    4. A data segment must be acknowledged before the next segment is transmitted.
  2. What does the Data Offset field in the TCP header specify?
    1. The length of the TCP header
    2. The location of the current segment in the sequence
    3. The length of the Data field
    4. The checksum value used for error detection
  3. Specify whether each of the following statements describes TCP, UDP, or both.
    1. It provides flow control.
    2. It is used for DNS communications.
    3. It detects transmission errors.
    4. It is used to carry DHCP messages.
    5. It divides data to be transmitted into segments.
    6. It acknowledges transmitted messages.
    7. It is used for Web client/server communications.
    8. It requires a connection establishment procedure.
    9. It contains a Length field.
    10. It uses a pseudo-header in its checksums.
  4. What is the combination of an IP address and a port number called?
    1. A sequence number
    2. A checksum
    3. A data offset
    4. A socket
  5. Which of the following is not true of the SPX protocol?
    1. It is connection-oriented.
    2. It operates at the transport layer only.
    3. Clients use it to access server files.
    4. It provides flow control.
  6. Which of the following TCP/IP systems uses an ephemeral port number?
    1. The client
    2. The server
    3. The system initiating the TCP connection
    4. The system terminating the TCP connection
  7. What flag does the first message transmitted in any TCP connection contain?
    1. ACK
    2. SYN
    3. FIN
    4. PSH
  8. At which layers of the OSI reference model does the NCP provide functions?
  9. What TCP header field provides flow control?
    1. Window
    2. Data Offset
    3. Acknowledgment
    4. Sequence Number
  10. Which of the following services does the UDP protocol provide?
    1. Flow control
    2. Guaranteed delivery
    3. Error detection
    4. None of the above