Do I Know This Already? Quiz

"Do I Know This Already?" Quiz

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

The 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 11-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 11-1. "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section	Questions Covered in This Section	Score
Root Guard	14
BPDU Guard	5
Loop Guard	68
UDLD	911
BPDU Filtering	12
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.	Why is it important to protect the placement of the Root Bridge? To keep two Root Bridges from becoming active To keep the STP topology stable So all hosts have the correct gateway So the Root Bridge can have complete knowledge of the STP topology
2.	Which of the following features protects a switch port from accepting superior BPDUs? STP loop guard STP BPDU guard STP root guard UDLD
3.	Which of the following commands can you use to enable STP root guard on a switch port? spanning-tree root guard spanning-tree root-guard spanning-tree guard root spanning-tree rootguard enable
4.	Where should the STP root guard feature be enabled on a switch? All ports Only ports where the Root Bridge should never appear Only ports where the Root Bridge should be located Only ports with PortFast enabled
5.	Which of the following features protects a switch port from accepting BPDUs when PortFast is enabled? STP loop guard STP BPDU guard STP root guard UDLD
6.	To maintain a loop-free STP topology, which one of the following should a switch uplink be protected against? A sudden loss of BPDUs Too many BPDUs The wrong version of BPDUs BPDUs relayed from the Root Bridge
7.	Which of the following commands can enable STP loop guard on a switch port? spanning-tree loop guard spanning-tree guard loop spanning-tree loop-guard spanning-tree loopguard enable
8.	STP loop guard detects which of the following conditions? The sudden appearance of superior BPDUs The sudden lack of BPDUs The appearance of duplicate BPDUs The appearance of two Root Bridges
9.	Which of the following features actively can test for the loss of the receive side of a link between switches? POST BPDU UDLD STP
10.	UDLD must detect a unidirectional link before which of the following? The Max Age timer expires STP moves the link to the blocking state STP moves the link to the forwarding state STP moves the link to the listening state
11.	What must a switch do when it receives a UDLD message on a link? Relay the message on to other switches Send a UDLD acknowledgment Echo the message back across the link Drop the message
12.	Which of the following features effectively disables spanning-tree operation on a switch port? STP PortFast STP BPDU filtering STP BPDU guard STP root guard

You can find the answers to the "Do I Know This Already?" quiz 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:

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

• 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 at the end of the chapter. Otherwise, move to Chapter 12, "Advanced Spanning Tree Protocol."