This document provides instructions for configuring standard access control lists (ACLs) on a router to block or permit traffic based on source IP addresses. It includes steps to create an ACL denying a specific host while permitting any other traffic, apply the ACL to an interface, and verify it is working. It also provides commands to remove a specific ACL entry or the entire ACL configuration.

1. ACCESS LIST
STANDARD ACCESS LIST
As close to destination
ALL DECISION BASED ON THE SOURCE IP ADDRESS , THEY DON’T DISTINGUISH BETWEEN
ANY OF THE MANY TYPES OF IP TRAFFIC SUCH AS WEB, TELNET , SO ON

2. STANDART ACCESS LIST
Block the network of pc0 to reach at the pc1
To check :
R1# show ip int brief
R1# show ip route
R2# show ip int brief
R3# show ip route
R2:
R2#conf t
R2(cnfg)# ip access-list standard 1
# deny host 192.168.1.2
# permit any
R2# show ip access-list
To apply ACL:
R2(cnfg)# int g0/0
#ip access-group 1 out
Now ping from pc0 to pc1 ACL working.
At first please do Routing RIP Version 2 and complete addressing

3. STANDART ACCESS LIST
Block the network of pc0 to reach at the pc1
To Remove :
R2#conf t
R2(cnfg)# ip access-list standard 1
#no 20 [20= number of acl]
For Telnet:
S2:
Conf t# enable password cisco
# line vty 0 1
# password cisco
Check its working
To remove the particular access list or telnet with standard ACL
Or :
R2(cnfg )# no acl