What are ACLs?

ACLs are a set of rules used most commonly to filter network traffic. They are used on network devices with packet filtering capatibilites (e.g. routers or firewalls). ACLs are applied on the interface basis to packets leaving or entering an interface.

For example on how ACLs are used, consider the following network topology:

acl example

Let’s say that server S1 holds some important documents that need to be available only to the company’s management. We could configure an access list on R1 to enable access to S1 only to users from the management network. All other traffic going to S1 will be blocked. This way, we can ensure that only authorized user can access the sensitive files on S1.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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