Contents
What is inbound ACL?
any packet coming to the router is considered as inbound. any packet going out of the router is considered as outbound. in acl, we usually use it at interface, any packet entering to interface is considered as inbound by ACL. any packet leaving out of interface is considered as outbound by ACL.
Where should standard ACLs be placed?
– Standard ACLs are placed as close to the destination as possible. – Standard ACLs filter packets based on the source address only so placing these ACLs too close to the source can adversely affect packets by denying all traffic, including valid traffic.
Which of the following is a standard ip ACL?
The standard access lists are ranged from 1 to 99 and from 1300 to 1999 so only access list 50 is a standard access list.
Where is standard and extended ACL located?
Extended ACLs should be located as close as possible to the source of the traffic to be filtered. This way, undesirable traffic is denied close to the source network, without crossing the network infrastructure. Standard ACLs should be located as close to the destination as possible.
Where to apply an extended ACL on a Cisco router?
Standard ACLs are an older type and very general. As a result they can inadvertently filter traffic incorrectly. Applying the standard ACL near the destination is recommended to prevents possible over-filtering. The extended ACL should be applied closest to the source.
When to use’in’and’out’in ACL direction?
If I have an ACL, when applying it to an interface, I need to say “in” or “out”. Is “in” referring to where the traffic is FROM, or where it is going TO?
How are IP Access Control Lists ( ACLs ) used?
This document describes how IP access control lists (ACLs) can filter network traffic. It also contains brief descriptions of the IP ACL types, feature availability, and an example of use in a network.
How to define ACL source and destination for a router?
In addition to defining ACL source and destination, it is possible to define ports, ICMP message types, and other parameters. A good source of information for well-known ports is RFC 1700 . ICMP message types are explained in RFC 792 . The router can display descriptive text on some of the well-known ports. Use a ? for help.