Appendix I. Practice for Chapter 25: Basic IPv4 Access Control Lists

Practice Problems

This appendix includes two sets of practice problems. The first question set lists requirements for a single-line access control list (ACL), with your task being to create a standard numbered ACL that meets the requirements. The second question set shows an existing access-list command, with your job being to determine the range of IP addresses matched by the ACL.

Note that you can find additional practice on the author’s CCENT blog, which is linked from the author’s website, www.certskills.com.

Practice Building access-list Commands

Table I-1 lists the criteria for several practice problems. Your job: Create a one-line standard ACL that matches the packets. The answers are listed later in this appendix.

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Table I-1 Building One-Line Standard ACLs: Practice

Reverse Engineering from ACL to Address Range

For this second question set, look at the existing access-list commands in Table I-2. In each case, make a notation about the exact IP address, or range of IP addresses, matched by the command.

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Table I-2 Finding IP Addresses/Ranges Matching by Existing ACLs

Note

You can only rely on the method of adding these numbers together (as shown in Chapter 25, “Basic IPv4 Access Control Lists”) if you know that the access-list command comes from the router and specifically is not what someone simply wrote on a piece of paper. In this case, you can assume that the statements in Table I-2 came from a router.

Answers to Earlier Practice Problems

This section contains the answers to the two sets of practice problems.

Answers: Practice Building access-list Commands

Table I-3 lists the answers to the problems listed in Table I-1.

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Table I-3 Building One-Line Standard ACLs: Answers

Answers: Reverse Engineering from ACL to Address Range

Table I-4 lists the answers to the problems listed in Table I-2.

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Table I-4 Address Ranges for Problems in Table I-2: Answers

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