TCP/IP

Question

The intermediate routers between source and destination do not need the following info in the IP header;

a)Protocol

b)Identification number

c)Source IP

d)IP version

e)None of these

Comments

@Sambhrant Maurya

What is the answer the given?

i am thinking it is Option A?

But i didn't have to explanation it, can you Post the answer?

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The answer given is none of these.

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ok

Answer 1

Yes, Protocol, Identification number, Source IP and Version, all are required by the intermediate routers. 

Identification number is required due to fragmentation done my the intermediate routers. In case of MTU size is less than the size of the packet, so here identification number is required in fragments. 

Protocol, Source IP and version are also necessary to process and send the packets correctly.

Comments

@Magma

What you want to convey from above matter?

 

see the packets which is not belonging to TCP

What happens if none of the packets are found? it discard the that IP packet and sent ICMP packet.

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Because incase of heavy traffic or congestion packets are discarded based on the protocol

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In Kurose & Ross it's written, "TCP runs only in the end systems and not in the intermediate network elements(routers). In fact intermediate routers are completely oblivious to TCP connections; they see datagrams, not connections." . Does it not mean routers are not aware of the protocol used?