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Cisco CCNA/CCENT Exam 640-802, 640-822, 640-816 Preparation Kit by Dale Liu

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CHAPTER 9. Access Control Lists
Introduction
Access control lists (ACLs) are one of the fundamental building blocks of a network configuration. If you fully understand how Access lists are constructed and used, you're well on your way to providing adequate security to your network. However, if you fail to grasp how wildcard masks are used or how order of operation affects Network Address Translation (NAT), then you could very well make your network the next successful target of a hacker. Understanding this topic is important, both for the test and for your career.
Unlike many technologies you will learn as a Cisco Certified Network Associate (CCNA) candidate, ACLs are really old. Standard ACLs that match traffic based on source Internet Protocol ...

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