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What does a router change in a packet when it forwards a
packet to the next hop?

* A: Destination physical address
* B: Destination network address
* C: Destination network address and the destination
physical address

Question Posted / mr.shahin07

Answer Posted / mr.shahin07

(10.0.0.1) (10.0.0.2)
S0 S0
(R1)------------------------(R2)
!E0/1 (0ACF:AAA1:000A) ! E0/1 (1ACF:BBA1:010A)
!IP - 172.16.1.100 ! IP - 172.17.1.100
! !
! !
! !
(Host A) (Host B)
E0 (ABC0:ABB1:00A0) E0 (CAA0:ABE1:110A)
IP - 172.16.1.1 IP - 172.17.1.1

Just assume this is a network & all interfaces having their
Layer 2 & Layer 3 addresses.

Now Host A want to send some data to Host B.

Now wat wud be the Layer 2 & 3 source & Destination address.

a) Packet leaving Host A.

Layer 3 Source add - 172.16.1.1
Layer 3 Destination add - 172.17.1.1

Layer 2 Source add - ABC0:ABB1:00A0 (E0 of Host A)
Layer 2 Destination add - 0ACF:AAA1:000A (E0/1 of R1)

b) Packet leaving Router R1 -

Layer 3 Source add - 172.16.1.1
Layer 3 Destination add - 172.17.1.1

Layer 2 Source add - 0ACF:AAA1:000A (E0/1 of R1)
Layer 2 Destination add - 1ACF:BBA1:010A (E0/1 of R2)

c) Packet leaving Router R2 -

Layer 3 Source add - 172.16.1.1
Layer 3 Destination add - 172.17.1.1


Layer 2 Source add - 1ACF:BBA1:010A (E0/1 of R2)
Layer 2 Destination add - CAA0:ABE1:110A (E0/1 of R2)

So every time DESTINATION PHYSICAL ADDRESS is changed.

Hi guys, i just share wat i know. Let me if i m wrong. Your
feedback is important for me.

With Thanx & Regards
Shahin Ahmed

Is This Answer Correct ?    5 Yes 1 No



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