Easy 6 multiple choice questions! please help! 1) Why is fragmentation of an IP

Question

Easy 6 multiple choice questions! please help!

1) Why is fragmentation of an IP packet sometimes required?

A)     Because an IP packet can hold more data than a frame

B)     Because different applications send different amounts of data

C)     Because networks can be subnetted

D)     Because IP is a connectionless protocol

   1.2 IPv6 fragmentation information is in

            a. the base header        b. an extension header           

c. the data field           d. no fragmentation information is required in IPv6

   1.3 What is the difference between fragmentation in IPv4 and IPv6?

A)     IPv6 uses larger fragments than IPv4

B)     IPv6 packets can only be fragmented at the source but IPv4 packets can be fragmented by the source or any router

C)     IPv6 automatically fragments every packet

   1.4 Every destination address matches the routing table entry 0.0.0.0/0

A. True                       b. False

    1.5 Why does a router need a subnet mask for every destination network in the forwarding

         table?

A)     To indicate whether IPv4 or IPv6 addresses are used

B)     To indicate the hop count

C)     To indicate the MAC address

D)     To indicate the net_id part of the destination network address

1.6 Every router knows the complete path to every host on the internet

       a. true      b. false

Explanation / Answer

1.   A

2.   B

3.   B

4.   A (defult destination, if there is no match in routing table)

5.   D

6.   A

Some theory that supports explanation of above question:

One of the innovations introduced by IPv6 is the elimination of hop-by-hop packet fragmentation. With the new protocol, fragmentation is managed at the ends by means of a special extension header.

More specifically, there are two main differences: Difference one is the fields for handling fragmentation are not in the basic IPv6 header but are put into an extension header if fragmentation is required. This makes IPv6 fragmentation lean because this fragmentation extension header is only inserted in the packet, if fragmentation needs to be done. Difference two is that IPv6 routers do not fragment anymore. Fragmentation has to be done by the source host. He will evaluate the packet size by using Path MTU discovery.

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