Free CCNA In Hindi | Chapter32 - What is ACL?

Access-list (ACL) is a set of rules defined for controlling network traffic and reducing network attacks. ACLs are used to filter traffic based on the set of rules defined for the incoming or outgoing of the network.
Standard Access-list -
These are the Access-list which are made using the source IP address only. These ACLs permit or deny the entire protocol suite. They don’t distinguish between the IP traffic such as TCP, UDP, HTTPS, etc. By using numbers 1-99 or 1300-1999, the router will understand it as a standard ACL and the specified address as the source IP address.
Features -
Standard Access-list is generally applied close to destination (but not always).
In a standard access list, the whole network or sub-network is denied.
Standard access-list uses the range 1-99 and extended range 1300-1999.
Standard access-list is implemented using source IP address only.
If numbered with standard Access-list is used then remember rules can’t be deleted. If one of the rules is deleted then the whole access list will be deleted.
If named with standard Access-list is used then you have the flexibility to delete a rule from the access list. ( mob. [phone])