2 Data being shared between two computers is split up into a number of data packets prior to transmission. The data packets contain a header and a trailer.

a) Give three pieces of information found in the header.

b) The trailer contains a cyclic redundancy check (CRC).

i) Name another item found in the trailer.

ii) The following data is being sent in the payload:

11110000 00111111 00110011 11001100 11111110 11101110 00001100 11011111 11001001 Use this data to show how CRC is used to ensure no errors occurred during data transmission.

c) i) Explain how it is possible for data packets to be lost during their transmission across a network.

ii) Describe how it is possible to deal with lost packets so that they don’t cause network problems, such as ‘clogging up’

the system.