Question

Assume a TCP segment consisting of 1500 bits of data and 160 bits of header is sent to the IP layer, which appends 120 bits of header. This is then transmitted through some networks (via routers), each of which uses a 24-bit of packet header for packet transmissions. The destination network can accept a maximum packet size of 800 bits. How many bits, including headers, are delivered to the network layer protocol at the destination?

Answer 1

Answer:

1852 bits

Explanation:

The total number of bits transmitted = Number of data bits + number of header bits sent to IP layer + number of appended header bits.

The total number of bits transmitted = 1500 bits + 160 bits + 120 bits = 1780 bits

Ratio of number of bits transmitted to maximum packet size = 1780 bits / 800 bits = 2.225 = 3 (to next whole number)

Therefore the number of bits, including headers, are delivered to the network layer protocol at the destination =  total number of bits transmitted + (packet header × ratio)

Number of bits = 1780 bits + (3 × 24 bits) = 1852 bits