Do I Know This Already Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide whether you really need to read the entire chapter. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now.

The 12-question quiz, derived from the major sections in "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.

Table 9-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 9-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundations Topics Section

Questions Covered in This Section

Transparent Bridging

1-4

LAN Switching

5-8

LAN Segmentation

9-10

The Need for Spanning Tree

11-12

CAUTION The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark this question wrong for purposes of the self-assessment. Giving yourself credit for an answer that you correctly guess skews your self-assessment results and might provide you with a false sense of security.

1. Which of the following statements describes part of the process of how a transparent bridge makes a decision to forward a frame destined to a unicast MAC address?

a. Compares unicast destination address to the bridging, or MAC address, table b. Compares unicast source address to the bridging, or MAC address, table c. Forwards out all interfaces in the same VLAN, except the incoming interface.

d. Forwards based on the VLAN ID

e. Compares the destination IP address to the destination MAC address f. Compares the incoming interface of the frame to the source MAC entry in the MAC address table

2. Which of the following statements describes part of the process of how a LAN switch makes a decision to forward a frame destined to a broadcast MAC address?

a. Compares the unicast destination address to the bridging, or MAC address, table b. Compares the unicast source address to the bridging, or MAC address, table c. Forwards out all interfaces in the same VLAN, except the incoming interface.

d. Forwards based on the VLAN ID

e. Compares the destination IP address to the destination MAC address f. Compares the incoming interface of the frame to the source MAC entry in the MAC address table

3. Which of the following statements best describes what a transparent bridge does with a frame destined to an unknown unicast address?

a. Forwards out all interfaces in the same VLAN, except the incoming interface.

b. Forwards based on the VLAN ID

c. Compares the destination IP address to the destination MAC address d. Compares the incoming interface of the frame to the source MAC entry in the MAC address table

4. Which of the following comparisons is made by a switch when deciding whether a new MAC address should be added to its bridging table?

a. Compares the unicast destination address to the bridging, or MAC address, table b. Compares the unicast source address to the bridging, or MAC address, table c. Compares the VLAN ID to the bridging, or MAC address, table d. Compares the destination IP address's ARP cache entry to the bridging, or MAC address, table

5. Which of the following internal switching methods can start forwarding a frame before the entire frame has been received?

a. Cisco Express Forwarding b. Fast Switching c. Fragment-free d. Cut-through e. Store-and-forward

6. Which of the following internal switching methods must wait to receive the entire frame before forwarding the frame?

a. Cisco Express Forwarding b. Fast Switching c. Fragment-free d. Cut-through e. Store-and-forward

7. Which of the following features is determined during autonegotiation between a 10/100 Ethernet card and a switch?

b. Power levels (half or full)

c. Pins used for transmit d. Duplex (half or full)

8. Which of the following devices would be in the same collision domain as PC1 below?

a. PC2, which is separated from PC1 by an Ethernet hub b. PC3, which is separated from PC1 by a transparent bridge c. PC4, which is separated from PC1 by an Ethernet switch d. PC5, which is separated from PC1 by a router

9. Which of the following devices would be in the same broadcast domain as PC1 below?

a. PC2, which is separated from PC1 by an Ethernet hub b. PC3, which is separated from PC1 by a transparent bridge c. PC4, which is separated from PC1 by an Ethernet switch d. PC5, which is separated from PC1 by a router

10. A network currently has ten PCs, with five connected to hub1 and another five connected to hub2, with a cable between the two hubs. Fred wants to keep the PCs connected to their hubs but put a bridge between the two hubs. Barney wants to remove the hubs and connect all ten PCs to the same switch. Comparing Fred and Barney's solutions, which of the following is true?

a. Barney's solution creates more bandwidth than Fred's.

b. Barney's solution allows full duplex to the PCs, where Fred's does not.

c. Barney's solution creates ten times more collision domains than Fred's.

d. Barney's solution creates five times more collision domains than Fred's.

e. Barney's solution creates ten times more broadcast domains than Fred's.

11. Imagine a network with three switches, each with an Ethernet segment connecting it to the other two switches. Each switch has some PCs attached to it as well. Which of the following frames would cause loops if the Spanning Tree Protocol were not running?

a. Unicasts sent to the MAC address of a device that has never been turned on b. Unicasts sent to the MAC address of a device that has been turned on and is working c. Frames sent to the Ethernet broadcast address d. None of the above

12. Which of the following interface states could a switch interface settle into after STP has completed building a spanning tree?

a. Listening b. Blocking c. Forwarding d. Learning

The answers to the "Do I Know This Already?" quiz are found in Appendix A, "Answers to the 'Do I Know This Already?' Quizzes and Q&A Sections." The suggested choices for your next step are as follows:

■ 10 or less overall score—Read the entire chapter. This includes the "Foundation Topics" and "Foundation Summary" sections and the Q&A section.

■ 11 or 12 overall score—If you want more review on these topics, skip to the "Foundation Summary" section and then go to the Q&A section. Otherwise, move to the next chapter.

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