Chapter 5 Question Bank 5.1 Ethernet Protocol 1. Ethernet operates at what OSI layers? 2. Ethernet is defined by which IEEE standards? 3. What is the purpose of the LLC sublayer? 4. What are the two primary responsibilities of the Ethernet MAC sublayer? 5. List and describe the three primary functions of data encapsulation. 6. What is media access control responsible for? 7. What is the minimum and maximum frame size as defined by Ethernet II and IEEE 802.3? 8. Describe the structure of a MAC address as specified by IEEE standards? 9. What is a unicast MAC address? 10. What is the function of a multicast address? 11. Write out a broadcast MAC address. 12. What command is used to identify the MAC address of an Ethernet adapter on a Windows host? 13. What is the range of multiclass IPv4 addresses? 5.2 LAN Switches 14. What type of address does an Ethernet Switch use to make forwarding decisions? 15. How does a switch dynamically build up MAC address table? 16. Explain what happens if the source MAC address does exist in the table but on a different port. 17. If the destination IPv4 host is within the local network, the frame will use the MAC address of this device is used as the destination MAC address. For packets destined for external networks, which device’s MAC address would be used for the destination MAC address? 18. List and explain two forwarding methods for switching data between network ports. 19. List and explain two variants of cut-through switching. 20. An Ethernet switch may use a buffering technique to store frames before forwarding them, describe two memory buffering methods. 21. What is duplex mismatch? 22. Explain in detail the function of the auto-MDIX feature. 5.3 Address Resolution Protocol 23. There are two primary addresses assigned to a device on an Ethernet LAN. List and describe both. a. ________________________ b. ________________________ 24. The Layer 2 Ethernet frame contains: a. _______________________ b. _______________________ 25. The Layer 3 IP packet contains: a. _______________________ b. _______________________ 26. When the destination IP address is in an external (or remote) network which device’s MAC address is used as the destination MAC address? 27. If the destination IP address is known but the destination MAC address is not known, how does a host determine what is the destination MAC address? 28. What are the two basic function of ARP (Address Resolution Protocol)? a. _________________ b. _________________ 29. What command is used to display the ARP table on a Cisco router or Switch? 30. What command is used to display the ARP table on a Windows PC? 31. Explain how ARP spoofing or ARP poisoning works.