3.The following is a dump of a UDP header in hexadecimal format. 0045DF000058FE20 a. What is the source port number? b. What is the destination port number? c. What is the total length of the user datagram? d. What is the length of the data? e. Is the packet directed from a client to a server or vice versa? f. What is the client process?

Explanation:

a) The source port number is the first four hexadecimal digits (0045), which

means that the source port number is 69.

b) The destination port number is the second four hexadecimal digits (DF00),

which means that the destination port number is 57088

c) The third four hexadecimal digits (0058) defines the length of the whole UDP packet as 88 bytes.

d) The length of the data is the length of the whole packet minus the length of the header, or 88 – 8 = 80 bytes.

e) Since the source port number is 69 (well-known port), the packet is from the client to the server.

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