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This chapter is from the book

Q&A

The questions and scenarios in this book are more difficult than what you should experience on the actual exam. The questions do not attempt to cover more breadth or depth than the exam; however, they are designed to make sure that you know the answer. Rather than allowing you to derive the answers from clues hidden inside the questions themselves, the questions challenge your understanding and recall of the subject. Hopefully, these questions will help limit the number of exam questions on which you narrow your choices to two options and then guess.

You can find the answers to these questions in Appendix A.

  1. By default, how long are CAM table entries kept before they are aged out?

  2. A TCAM lookup involves which values?

  3. How many table lookups are required to find a MAC address in the CAM table?

  4. How many table lookups are required to match a packet against an access list that has been compiled into 10 TCAM entries?

  5. How many value patterns can a TCAM store for each mask?

  6. Can all packets be switched in hardware by a multilayer switch?

  7. Multilayer switches must rewrite which portions of an Ethernet frame?

  8. If a station only receives Ethernet frames and doesn't transmit anything, how will a switch learn of its location?

  9. What is a TCAM's main purpose?

  10. Why do the TCAM mask and pattern fields consist of so many bits?

  11. In a multilayer switch with a TCAM, a longer access list (more ACEs or statements) takes longer to process for each frame. True or false?

  12. A multilayer switch receives a packet with a certain destination IP address. Suppose the switch has that IP address in its Layer 3 forwarding table, but no corresponding Layer 2 address. What happens to the packet next?

  13. If a multilayer switch can't support a protocol with CEF, it relies on fallback bridging. Can the switch still route that traffic?

  14. To configure a static CAM table entry, the mac address-table static mac-address command is used. Which two other parameters must also be given?

  15. As a network administrator, what aspects of a switch TCAM should you be concerned with?

  16. What portion of the TCAM is used to evaluate port number comparisons in an access list?

  17. Someone has asked you where the host with MAC address 00-10-20-30-40-50 is located. Assuming you already know the switch it is connected to, what command can you use to find it?

  18. Complete this command to display the size of the CAM table: show mac .

  19. What protocol is used to advertise CAM table entries among neighboring switches?

  20. Suppose a host uses one MAC address to send frames and another to receive them. In other words, one address will always be the source address sent in frames, and the other is only used as a destination address in incoming frames. Is it possible for that host to communicate with others through a Layer 2 switch? If so, how?

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