11. (1) Suppose after timeout, one of the fragments for an IP datagram is not re

Question

11. (1) Suppose after timeout, one of the fragments for an IP datagram is not received by the
destination. What will the destination do then?

a. Ask the source to retransmit the missing fragment.
b. Discard all received fragments.
c. Assemble all received fragments into one IP datagram.
d. None of the above.
answer: ______

12. (1) An ARP request involves with only one physical network.
True or False? answer: ______

13. (1) When an error is detected during the transmission of an ICMP datagram, a new ICMP
datagram will be generated to report the error.

True or False? answer: ______


14. (1) What will a router do if it detects that the IP checksum is incorrect?
a. It corrects the error in IP header and forwards the datagram to the next hop.
b. It corrects the error in IP payload and forwards the datagram to the next hop.
c. It sends an ICMP message back to the sender.
d. It drops the datagram.
answer: ______

16. (1) To trace route, it is better to use the IP option of TRACEROUTE than the TTL mechanism.
Why? (Pick up all correct reasons.)
a. Only one request datagram is needed.
b. The path reported is exactly the path traversed by the datagram.
c. For the TRACEROUTE option, the router must respond. However for TTL, the router may choose not to respond.
d. The response to TRACEROUTE is a special ICMP message, which is guaranteed for its
reliable delivery to the source.
answer: __________________

17. (1) The router is responsible for reassembling fragments.
True or False? answer: ______
18. (2) What is the best-effort data transmission of IP? Give two characters.
answer: ____________________________________________________________
answer: ____________________________________________________________



I appreciate your help

Explanation / Answer

Dear.. 11. b. Discard all received fragments. is correct. A single IP datagram can be divided into multiple datagrams of a smaller size, known as IP fragments. ISA Server can filter these fragments. 12. False: An ARP request involves with only one MAC adderss. 13. TRUE: ICMP can report errors on any IP datagram with the exception of ICMP messages, to avoid infinite repetitions. 14. a.option is correct It corrects the error in IP header and forwards the datagram to the next hop. 17. TRUE: Offset - It helps to identify the sequence numbers of fragments and re-assemble the fragmented data/fragments properly using sequence numbers

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