Today we are knowledge share Access List for cisco router. So, develop your idea………………
IP access lists are a sequential list of permit and deny conditions that apply to IP addresses or upper-layer protocols. Access Control Lists are used in routers to identify and control traffic.
Put standard access lists as near the destination as possible and extended access lists as close to the source as possible.
Access lists have an implicit deny at the end of them automatically. Because of this, an access list should have at least one permit statement in it; otherwise the access list will block all remaining traffic.
Access lists applied to interfaces default to outbound if no direction is specified.
-1 is used with IPX access lists to specify wildcard networks.
Limiting broadcast traffic is important because a broadcast frame is more likely to cause a collision than a unicast frame.
There are two types of access lists
Standard access lists; standard IP access lists check source address of packets. The result permits or denies the packet output for the ENTIRE PROTOCOL SUITE based on the only source address. Standard access lists do not specify destination addresses. Standard access list have a number from 1 to 99.IPX Standard access lists are numbered from 800 to 899.
Extended access lists; extended IP access lists check for both source and destination packet addreses.They can also check for SPECIFIC PROTOCOLS,port numbers,and other parameters,which give administrators more flexibility and control. Extended access lists have a number from 100 to 199.IPX extended access lists are numbered from 900 to 999.
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