The Important Characteristics and Limitations of Standard IPv4 Access Control Lists (ACLs)

What describes a characteristic of standard IPv4 ACLs?

A characteristic of standard IPv4 Access Control Lists (ACLs) is that they are based solely on the source IP address of the packets.

Standard IPv4 ACLs do not consider the destination IP address, protocol type, or any other attributes of the packets.

When a packet enters a router or a firewall, it is evaluated against the rules defined in the standard IPv4 ACL in sequential order.

Each rule in the ACL contains an IP address or a wildcard mask that matches a range of IP addresses. If the source IP address of the packet matches the criteria stated in a rule, then the action associated with that rule is applied to the packet.

Standard IPv4 ACLs are often used to control the traffic flow from specific source IP addresses to a particular network or device.

They are commonly used for basic security purposes like allowing or denying access to resources based on the source IP address.

It is important to note that standard IPv4 ACLs are not very granular and lack flexibility.

They lack the ability to filter based on destination IP address or consider other attributes of the packets.

For more complex network filtering, extended IPv4 ACLs that can filter based on multiple criteria, such as destination IP address and port number, should be used.

More Answers:
Understanding ACL Matching Range: How the access-list 1 permit 172.16.0.0 0.0.15.255 Statement Works
Converting an ACL Filter with Wildcard Mask 0.0.1.255 to a Range of IP Addresses
How to Restrict Access to the Virtual Terminal of a Router – Step-by-Step Guide

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