Tell me what you want to do (8pts) For each of the following, state whether or n

Question

Tell me what you want to do (8pts) For each of the following, state whether or not the address given is a valid formatted MAC address. If it is not a valid MAC address, explain in one sentence why not. 1. A. 196-FOF-FE-12-34-56 B. FA-BC-87-5E-9B-16 C. 14-25-65-24-10-17 D. 1f-f7-0a-91-00-bc Valid 2. (5pts) Assume a five layer TCP/IP model as shown in the class notes. The initial data at the application layer is 382 bytes. A 15 byte header is added at each of the transport, network, and data link layers. The data link layer trailer is 8 bytes. Show your work to get full credit for the following questions: a. What are the total bytes sent to the hardware? b. In percentages, what is the overhead? c. In percentages, what is the portion of the total bytes sent that is data? 3. (2pts) Explain why encapsulation is useful for the networking model. 4. (10pts) State for each part below, which layer of the TCP/IP five layer model does the following? 1. Transmitting O's and 1's via fiber optic cable 2. Using email 3. Uses a port number to identify a process 4. Uses an MAC address 5. Provides process to process communication 6. Provides host to host communication on different LANs 7. Uses a CRC (Cyclic Redundancy Code) to check for transmission errors 8. Transmits a packet through a router between networks 9. Uses an IP address to identify correct node 10. Transmits a frame through a wide area network (4pts) Go to http://www.rfe-editor org to look at a couple of Requests for Comment (RFC) a. Look up RFC 793, Transmission Control Protocol Specification. Find the information about the IP header. List each field in the header. (You do not have to explain them, just list them). b. What is the theoretical maximum number of unique source or port numbers based on the field size? 5. (4pts) Do the following base conversions. You must show your work on at least one problem for full credit a. Convert the binary number 101101100 to decimal b. Convert the binary number 10110011000111010 to hexadecimal c. Convert the decimal number 186 to binary d. Convert the hexadecimal number 7A10F to binary

Explanation / Answer

1-Following IEEE 802 standards, MAC address should be six groups of two hexadecimal digits separated by either hyphens or colons.

A.196-F0F-FE-12-34-55 – INVALID

                Because, 196 and F0F are not 2 hexadecimal format. There should be only 2 hexa digits

B.FA-BC-87-5E-9B-16 – VALID

                6 groups of hexadecimal digits and every group is 2 hexadecimal digits.

C.14-25-65-24-10-17 - VALID

                6 groups of hexadecimal digits and every group is 2 hexadecimal digits.

D.1f-f7-0a-91-00-bc - VALID

                6 groups of hexadecimal digits and every group is 2 hexadecimal digits.

[note: please post remaining questions separately]

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