What is the main role of media access control

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Reference no: EM133084256

Problem Sheet
Question 1. Which of the following best describes the role of data link layer?
(i) It deletes entries in the ARP cache.
(ii) It uses sockets to identify running applications.
(iii) It provides communication between locally networked devices.
(iv) It uses sequence numbers to maintain the reliability.
(v) It is layer 3 in the TCP/IP model of networking.

Question 2. Which of the following statement(s) about data link layer is/are incorrect?
(i) Data link layer is the interface between network layer and physical media.
(ii) Data link interface to the network is the Network Interface Card.
(iii) Data link layer provides multiplexing of multiple upper layer conversations to the physical media.
(iv) Data link layer uses the IP address for communication.

Question 3. Define the following acronyms
(i) LLC
(ii) MAC

Question 4. Describe the main role of data link LLC.

Question 5. The LLC is sometimes described as providing a multiplexed service to upper layer protocols. Describe what this statement means with an example.

Question 6. What is the main role of Media Access Control component of data link layer?

Question 7. How many bits constitute a MAC address?

Question 8. Describe two constituent parts of a MAC address.

Question 9. What Windows command will display the MAC address of your computer's network interface card?

Question 10. What Linux command will display the MAC address of your computer's network interface card?

Question 11. Network cards are said to be smart devices. Justify this statement.

Question 12. Describe the process that leads to the detection of corrupted frames at data link layer.

Question 13. An Ethernet frame contains CRC, source MAC address, FTP header, IP header, TCP header, destination MAC address, and protocol type. Describe their order in sequence.

Question 14. How many bytes constitute the source MAC address in an Ethernet frame?

Question 15. How many hexadecimal digits are required to specify an Ethernet broadcast address? What is a broadcast address?

Question 16. Describe how each of the following works?
(i) CSMA/CD
(ii) CSMA/CA

Question 17. Describe when entries are added to and removed from ARP cache.

Question 18. As a data link frame moves through an internetwork, the Ethernet frame header is modified at each step. Why does this happen?

Question 19. The number of entries in ARP cache changes with time. Describe the events that lead to the addition of entries to the cache and events that lead to the removal of entries from ARP cache.

Question 20. Describe how to generate an ARP request and reply from your Linux Lite machine.

Question 21. Generate and capture an ARP request and the corresponding reply.

Question 22. Determine the following.
(i) Contents of target's MAC address field in the ARP request.
(ii) Contents of target's MAC address field in the ARP reply.
(iii) Contents of sender's MAC address field in the ARP reply.

Reference no: EM133084256

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