1. A client uses UDP to send data to a server. The data length is 16 bytes. Calculate the efficiency of this transmission at the UDP level (ratio of useful bytes to total bytes).
2. The following is a dump (contents) of a UDP header in hexadecimal format.
0045DF0000580000
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 application-layer protocol?
g. Has the sender calculated a checksum for this packet?