MadeEasy Test Series 2017: Computer Networks - Ip Packet

Question

Consider station “A” send data to station “B”. Data frame contain MAC address, IP address and port address. Which of the following address may change on intermediate router

A Destination IP address

B Destination MAC

C Source MAC

D Source IP address

Comments

B and c should be the right answer..

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Yeah.I though the same.But they have given destination MAC as the answer. But both can be changed.Thanks for confirming:)

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Yes.. You can also confirm it on forouzan page48.. It is clearly written that both will changes when they hit the intermediate router.

Answer 1

when send DATA to a particular host...during top to down going we first of all add PORT number to message at Transport layer then we add IP of destination at network layer adn then we add MAC address at DATA link layer ...

when data is recieved by intermediate ROUTER...it will see the MAC address mainly ...

now during data transfer from router1 to router2..source MAC is of router 1 and destination router is router2..

SO when we send data.... router will change..

SOURCE MAC and DESTINATION MAC...  

Answer 2

B and C should be the correct answer because Source IP address and Destination IP address does not change.