test series

Question

In a IPv6 protocol communication, If total Router Header length is 448 bits. Then how many routers or hops are there for the packet to reach destination.

1.   3
2.   4
3.   5
4.   2

Comments

3 routers  to hop.

Answer 1

Router header length = 448 / 8 = 56 bytes

We know,
First 8 bytes are fixed( Next header(1 byte), Header Extension length(1 byte), Routingtype(1 byte), segments left(1 byte), Reserved(4 bytes)).

So 56 - 8 = 48 bytes are hop addresses.
Each address is 16 bytes.

So 48 / 16 = 3