LAB – SIMULATION
The task is to create and apply an access-list with no more than three statements that will allow ONLY host C web access to the Finance Web Server.

Answer: See the explanation

Explanation:
Select the
console on Corp1
router
Configuring ACL
Corp1>enable
Corp1#configure terminal
comment: To permit only Host C (192.168.33.3){source addr} to access finance server address
(172.22.242.23) {destination addr} on port number 80 (web)
Corp1(config)#access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
comment: To deny any source to access finance server address (172.22.242.23) {destination addr}
on port number 80 (web)
Corp1(config)#access-list 100 deny tcp any host 172.22.242.23 eq 80
comment: To permit ip protocol from any source to access any destination because of the implicit
deny any any statement at the end of ACL.
Corp1(config)#access-list 100 permit ip any any
Applying the ACL on the Interface

comment: Check show ip interface brief command to identify the interface type and number by
checking the IP address configured.
Corp1(config)#interface fa 0/1
If the ip address configured already is incorrect as well as the subnet mask. this should be corrected
in order ACL to work
type this commands at interface mode :
no ip address 192.x.x.x 255.x.x.x (removes incorrect configured ipaddress and subnet mask)
Configure Correct IP Address and subnet mask :
ip address 172.22.242.30 255.255.255.240 ( range of address specified going to server is given as
172.22.242.17 – 172.22.242.30 )
comment: Place the ACL to check for packets going outside the interface towards the finance web
server.
Corp1(config-if)#ip access-group 100 out
Corp1(config-if)#end
Important: To save your running config to startup before exit.
Corp1#copy running-config startup-config
Verifying the Configuration :
Step1: show ip interface brief command identifies the interface on which to apply access list.
Step2: Click on each host A,B,C & D . Host opens a web browser page , Select address box of the web
browser and type the ip address of finance web server(172.22.242.23) to test whether it permits
/deny access to the finance web Server .
Step 3: Only Host C (192.168.33.3) has access to the server . If the other host can also access then
maybe something went wrong in your configuration . check whether you configured correctly and in
order.
Step 4: If only Host C (192.168.33.3) can access the Finance Web Server you can click on NEXT button
to successfully submit the ACL SIM.