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Don t be surprised to see a handful of questions on ACLs and ACL troubleshooting on the exam, where you ll see Cisco emphasize this topic more so than others, since ACLs are a commonly used tool on IOS devices Remember that you can use ACLs for things other than filtering of traffic through the IOS device, such as restricting VTY access to the device When filtering traffic, the inbound ACL is processed first before traffic is forwarded to a destination interface Be able to compare and contrast standard and extended IP ACLs and the kinds of information each can filter Be very familiar with how ACLs are processed and the order that statements occur in an ACL
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Remember that if you omit the wildcard mask in a standard ACL, it defaults to 0000, a particular host you might see a troubleshooting question related to this type of misconfiguration Be able to troubleshoot problems based on ACL entries being placed in an incorrect order Use the accessclass command to restrict VTY access to an IOS device Don t be surprised if you have to configure an actual ACL and activate it on a router s interface or VTY lines Be comfortable in examining extended ACL examples and determining what the ACL commands are actually filtering You might also have to configure and activate an extended ACL on a router to filter traffic between locations You should know how to create an ACL remark and use sequenced ACLs to edit existing ACLs Be comfortable in using the show commands to examine and troubleshoot ACL configurations
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Be very familiar with the syntax of both IP standard and extended ACLs, including the numbers allowed for both types You need to be very comfortable with wildcard masks and how they are used to match on a range of addresses Remember the trick of subtracting a subnet mask from a local broadcast address to get the corresponding wildcard mask You might see troubleshooting questions in which the wildcard mask is configured incorrectly be able to identify correct wildcard masks based on the range of addresses that will be matched on Remember that ACLs are activated on interfaces inbound and/or outbound
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Remember the two rules for where standard versus extended ACLs are placed:
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Standard ACLs should be placed
as close to the destination devices as possible
Extended ACLs should be placed as
close to the source devices as possible
22: Access Control Lists
CERTIFICATION SUMMARY
ACLs can be used to filter traffic and routing information, restrict telnet and SSH access to your IOS device, prioritize traffic, trigger dial-on-demand routing (DDR) phone calls, and many other things ACLs are statements grouped together by a number or name that defines traffic that should be permitted or denied ACLs can be applied in either the inbound or outbound direction With an inbound ACL, the ACL is processed first before any other processing is done on the packet With an outbound ACL, the packet is routed to the outbound interface first and then the ACL is processed Standard IP ACLs allow you to filter on the source IP address, while extended IP ACLs allow you to filter on the source and destination IP addresses, the IP protocol, and protocol information (such as port numbers) ACLs are processed top-down until a match is found; at that point, no other statements are processed Therefore, the order of the statements is important If no match is found, the implicit deny rule takes place and the packet is dropped You can have one ACL, per protocol, per interface, per direction on that interface There are two special filtering rules for ACLs: you cannot filter traffic the router itself originates, and applying an empty ACL to an interface permits all traffic by default Standard ACLs can have numbers ranging from 1 to 99 and 1300 to 1999, and extended ACLs can have numbers ranging from 100 to 199 and 2000 to 2699 Standard ACLs should be placed as close to the destination as possible, while extended ACLs should be placed as close to the source as possible To create a numbered ACL, use the access-list command Use the ip access-group command to activate your ACL on an interface To filter telnet traffic to and from your router, activate the standard IP ACL on your VTY lines with the access-class command When making changes to ACLs, use the sequenced ACL feature to insert new statements or delete existing ones To create a named ACL, use the ip access-list standard|extended command This will take you into the appropriate Subconfiguration mode Wildcard masks allow you to match a single address, a range of addresses, or all addresses Basically, a wildcard mask is like an inverted subnet mask A 0 in a bit position means match, and a 1 means ignore To convert a subnet mask to a wildcard mask, subtract each octet in the subnet mask from 255, resulting in the corresponding octet value for the wildcard mask With standard ACLs, if you omit the wildcard mask, it defaults to 0000 The show ip interfaces command will display any ACLs that have been activated on your router s interfaces The show access-lists command displays all ACLs configured on your router for all protocols, including hit-count values for each statement in the list The show ip access-list command displays only IP ACLs
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