Do I Know This Already Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide whether you 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 13-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.

Table 7-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 7-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section

Questions Covered in This Section


Switch Port Aggregation with EtherChannel


EtherChannel Negotiation


EtherChannel Configuration


Troubleshooting an EtherChannel


Total Score

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. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might give you a false sense of security.

1. If Fast Ethernet ports are bundled into an EtherChannel, what is the maximum throughput supported on a Catalyst switch?


100 Mbps


200 Mbps


400 Mbps


800 Mbps


1600 Mbps

2. Which of these methods distributes traffic over an EtherChannel?

a. Round robin b. Least-used link c. A function of address d. A function of packet size

3. What type of interface represents an EtherChannel as a whole?

a. Channel b. Port c. Port-channel d. Channel-port

4. Which of the following is not a valid method for EtherChannel load balancing?

a. Source MAC address b. Source and destination MAC addresses c. Source IP address d. IP precedence e. UDP/TCP port

5. How can the EtherChannel load-balancing method be set?

a. Per switch port b. Per EtherChannel c. Globally per switch d. Can't be configured

6. What logical operation is performed to calculate EtherChannel load balancing as a function of two addresses?

7. Which one of the following is a valid combination of ports for an EtherChannel?

a. Two access links (one VLAN 5, one VLAN 5)

b. Two access links (one VLAN 1, one VLAN 10)

c. Two trunk links (one VLANs 1 to 10, one VLANs 1, 11 to 20)

d. Two Fast Ethernet links (both full duplex, one 10 Mbps)

8. Which of these is a method for negotiating an EtherChannel?




9. Which of the following is a valid EtherChannel negotiation mode combination between two switches?

a. PAgP auto, PAgP auto b. PAgP auto, PAgP desirable c. on, PAgP auto d. LACP passive, LACP passive

10. When is PagP's "desirable silent" mode useful?

a. When the switch should not send PAgP frames b. When the switch should not form an EtherChannel c. When the switch should not expect to receive PAgP frames d. When the switch is using LACP mode

11. Which of the following EtherChannel modes does not send or receive any negotiation frames?

a. channel-group 1 mode passive b. channel-group 1 mode active c. channel-group 1 mode on d. channel-group 1 mode desirable e. channel-group 1 mode auto

12. Two computers are the only hosts sending IP data across an EtherChannel between two switches. Several different applications are being used between them. Which of these load-balancing methods would be more likely to use the most links in the EtherChannel?

a. Source and destination MAC addresses.

b. Source and destination IP addresses.

c. Source and destination TCP/UDP ports.

d. None of the other answers is correct.

13. Which command can be used to see the status of an EtherChannel's links?

a. show channel link b. show etherchannel status c. show etherchannel summary d. show ether channel status

The answers to the quiz are found in Appendix A, "Answers to Chapter 'Do I Know This Already?'

Quizzes and Q&A Sections." The suggested choices for your next step are as follows:

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

■ 9-11 overall score—Begin with the "Foundation Summary" section and then follow up with the "Q&A" section at the end of the chapter.

■ 12 or more overall score—If you want more review on these topics, skip to the "Foundation Summary" section and then go to the "Q&A" section at the end of the chapter. Otherwise, move to Chapter 8, "Traditional Spanning Tree Protocol."

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