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Access control list (Active Directory Users and Computers (These services…
Access control list
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ACL operation
An ACL is a series of IOS commands that control whether a router forwards or drops packets based on information found in the packet header. ACLs are among the most commonly used features of Cisco IOS software.
Filter traffic based on traffic type. For example, an ACL can permit email traffic, but block all Telnet traffic.
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Introduction
Access control list
This chapter explains how to configure and troubleshoot standard IPv4 ACLs on a Cisco router as part of a security solution.