Representation of a tcp header, Computer Network Security

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(a) Figure is a representation of a TCP header. For each of the fields lettered from A to G, state the name of the field and provide a brief explanation for the function of each field in the header.

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(b) Justify the use of UDP (User Datagram Protocol), despite the fact that another transport layer protocol, TCP gives reliability, flow control as well as congestion control.

i. NAT
ii. DHCP
iii. ICMP.

(d) State two main differences between an IPv4 and an IPv6 address.

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