Florida Gulf Coast University

GEB 3250

Chapter 9 Quiz

1)ICMP is a__layer protocol.

1. 1. 1. data link
      2. transport
      3. network
      4. none of the above
2. ) ICMP messages are divided into two broad categories:

1. query and error reporting messages
2. request and response messages
3. request and reply messages
4. none of the above

3. ) An ICMP message has                       header and a variable-size data section.

1. a 16-byte
2. a 32-byte
3. an 8-byte
4. none of the above

4. ) Which of the following is true about ICMP messages?

1. An ICMP error message may be generated for an ICMP error message.
2. An ICMP error message may be generated for each fragment.
3. An ICMP error message may be generated for a multicast datagram.
4. none is true

5. ) Which of the following is true about ICMP messages?

1. An ICMP error message may be generated for an ICMP error message.
2. An ICMP error message may be generated only for the first fragment.

3. An ICMP error message may be generated for a multicast datagram.
4. none is true

6. ) Which of the following is true about ICMP messages?

1. An ICMP error message may be generated for an ICMP error message.
2. An ICMP error message may be generated only for each fragment.
3. No ICMP error message will be generated for a datagram having a special address such as 127.0.0.0 or 0.0.0.0.
4. none is true

7. ) If a host needs to synchronize its clock with another host, it sends a                                     message.

1. timestamp-request
2. source-quench
3. router-advertisement
4. none of the above

8. ) The purpose of echo request and echo reply is to                               .

1. report errors
2. check node-to-node communication
3. check packet lifetime
4. none of the above

9. ) In error reporting the encapsulated ICMP packet goes to                                   .

1. the original sender
2. the receiver
3. a router
4. none of the above

10. ) What field uniquely identifies the kind of ICMP message (for example, echo reply versus echo

request)?

1. type
2. code
3. option ID
4. none of the above

11. ) When the hop-count field reaches zero and the destination has not been reached, a

                    error message is sent.

1. destination- unreachable
2. time-exceeded
3. parameter-problem
4. none of the above

12. ) When all fragments of a message have not been received within the designated amount of time, a

                    error message is sent.

1. source-quench
2. time-exceeded
3. parameter-problem

4. none of the above

13. ) Errors in the header or option fields of an IP datagram require a                                         error message.

1. parameter-problem
2. source-quench
3. router-solicitation
4. none of the above

14. ) A                      can learn about network                           by sending out a router-solicitation packet.

1. router, routers
2. router, hosts
3. host, routers
4. none of the above

15. ) Who can send ICMP error-reporting messages?

1. routers
2. destination hosts
3. a and b
4. none of the above

16. ) One method to alert a source host of congestion is the                                message.

1. redirection
2. echo-request
3. source-quench
4. none of the above

17. ) A time-exceeded message is generated if                           .

1. the round-trip time between hosts is close to zero
2. fragments of a message do not arrive within a set time
3. a and b
4. none of the above

18. ) To determine whether or not a node is reachable,                                message can be sent.

1. an echo-reply
2. an echo-request
3. a redirection
4. none of the above

19. ) In calculating the time difference between two clocks, a negative value indicates

                   .

1. an invalid calculation
2. the source clock lags behind the destination clock
3. the destination clock lags behind the source clock
4. none of the above

20. ) An IP datagram (datagram A) cannot reach its destination. An ICMP error message is sent to the

source. The data field of the IP datagram (datagram B) that encapsulates the ICMP packet contains

                   .

1. only the ICMP header
2. the ICMP header plus 8 bytes of datagram A