1) For each of the following, state whether or not the address given is a valid
ID: 3637822 • Letter: 1
Question
1)For each of the following, state whether or not the address given is a valid MAC address. If it is not a valid MAC address, explain in one sentence why not.
A. 24.17.232.7B.55
B. 24.1.12.99
C. 23.07.4F.17.84.4
D. 22.14.67.12.70
2)
Assume a five layer TCP/IP model as shown in the class notes. The initial data at the application layer is 1080 bytes. A 140 byte header is added at each of the transport, network, and data link layers. For this problem, assume there are no trailers at any layer. What are the total bytes sent to the hardware? In percentages, what is the overhead? Show your work to get full credit.
Explanation / Answer
1.) A: Invalid, 232 is out of the hexadecimal range, while 7B is a hexadecimal number. Also there are only 5 octets. B: Invalid, this is an IP address. Four dotted octects. C: Invalid, the final octet is incomplete. It would need to be 04 (in Hex format). D: Invalid, it is missing an octet. 2.) 1080 bytes + 140*3 = 1500 Bytes, (420 Bytes overhead) Overhead per layer as a percentage of the total packet: 140/1500 = 9.3% Total overhead as a percentage of total packet: 420/1500 = 28%
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