Question

A TCP segment consisting of 1500 bits of data and 160 bits of header is sent to the IP layer, which appends another 160 bits of header. This is then transmitted through two networks, each of which uses a 24-bit packet header. The destination network has a maximum packet size of 600 bits. How many bits, including headers, are delivered to the network layer protocol at the destination?

Answer 1

**TCP data size = 1500 bits

Data bits transferred to Internet protocol layer

=1500 Transport layer data bits + 160 Transport layer header bits = 1660 bits

**Bits transferred to network layer

= {1660 IP data bits + 160 IP header bits }= 1820 bits

**Since maximum packet size is 600 bits, it will need

1820/600 = 3.03 = 3 bits (almost)

So bits delivered= 1820 bits + (3* 24 bits) =1892 bits

So 1892 bits are delivered here !!