Types of ACLs

Standard ACL: Use a standard ACL when you need to permit or deny traffic based on source IP address. Standard ACLs are also useful when you need to quickly control a performance problem by limiting traffic from a subnet, group of devices, or a single device. (This can block all inbound or outbound IP traffic from the configured source, but does not block traffic from other sources within the network.) This ACL type uses a numeric ID of 1 through 99 or an alphanumeric ID string. You can specify a single host, a finite group of hosts, or any host.