1. (8pts) For each of the following, state whether or not the address given is a
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Question
1. (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. A. A4-100-33-7B-55-10 B. 24-11-077-69-07-1F C. 17-A6-FF-99-60 D. 11-67-23-92-27-00
2. (5pts) Assume a five layer TCP/IP model as shown in the class notes. The initial data at the application layer is 170 bytes. A 50 byte header is added at each of the transport, network, and data link layers. The data link layer trailer is 10 bytes. What are the total bytes sent to the hardware? In percentages, what is the overhead? In percentages, what is the portion of the total bytes sent that is data? Show your work to get full credit.
3. (2pts) Provide a benefit why encapsulation is useful in building frames?
4. (10pts) State for each part below, which layer of the TCP/IP five layer model does the following? a. Uses an IP address b. Google Search c. Transmits a frame through a local area network d. Transmitting 0’s and 1’s via satellite transmission e. Provides host to host communication f. Uses a MAC address g. Made up of cables, hubs, and NICs h. Transmits a packet through a router between networks i. Provides process to process communication j. Uses a CRC (Cyclic Redundancy Code) to check for transmission errors
5. (4pts) Go to http://www.rfc-editor.org to look at a couple of Requests for Comment (RFC). a. Look up RFC 791, Internet Protocol (IP). Look at the IP header. List each field in the header. (You do not have to explain them, just list them). b. Describe the “Time to Live” field found in the header.
6. (4pts) Do the following base conversions. You must show your work on at least one problem for full credit. a. Convert the binary number 10110111 to decimal b. Convert the binary number 1001101101 to hexadecimal c. Convert the decimal number 93 to binary d. Convert the hexadecimal number 9A7B1 to binary
7. (3pts) A byte is 8 binary bits. a. What is the smallest unsigned decimal number that can be represented by one byte? b. What is the largest unsigned decimal number that can be represented by one byte? c. What range can be represented by one byte?
8. (10pts) Do the following logic calculations:
a. 101101 AND 1001
b. 11111111 AND 10011001
c. 6D AND 23 (these numbers are hexadecimal). Provide the answer in hexadecimal
d. 6D OR 23 (these numbers are hexadecimal). Provide the answer in hexadecimal
e. 11111111 OR 10011011
9. (2pts) Each station on an Ethernet network has its own unique physical address, called a MAC address. The address is of the form xx-xx-xx-xx-xx-xx or xx:xx:xx:xx:xx:xx, where each x is a hexadecimal digit.
a. Find the MAC address of a computer. (Some will have more than one MAC address - just pick one. Home computers that use modems may not contain an Ethernet card and may not have a MAC address – just make one up in this case) To get the MAC address on a PC, open a command window (usually by clicking Accessories and then clicking Command Prompt) and type getmac at the prompt. For other computers, you will need to look up how to get the MAC address. If you are using Linux the command is: ifconfig –a
b. Convert the MAC address you listed to binary. How many bits is it?
Thank you
Explanation / Answer
1.) We know that MAC addresses are of 48 bits and that too represented in the form of 8-bits. So, we will have 6 hexadecimal number pairs. So, valid MAC address will be of form XX.XX.XX.XX.XX.XX where X is in hexadecimal format.
a.) A4-100-33-7B-55-10 is not a valid MAC address as we can't have 100 in a valid MAC address.
b.) 24-11-077-69-07-1F is not a valid MAC address as we can't have 077 in valid MAC address
c.) 17-A6-FF-99-60 is not a valid MAC address as well because it is not 48 bits long.
d.) 11-67-23-92-27-00 is a valid MAC address as it is 48 bits long and it is in correct range as well.
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