ACL question

 

Task:
Using a minimal numer of config lines, allow R1 to accept only the following routes from R8:

172.16.107.0/24
192.168.2.0/24
192.168.3.0/24

My answer:  
ip access-list standard ALLOW-ROUTES
 permit 128.0.2.0 108.184.105.0

Router EI 20
distribute-list ALLOW-ROUTES in

This works.

Answer book suggests:
access-list 10 permit 0.0.2.0 255.255.253.0
 


 

Anyone care to suggest what automatic grading would do in this scenario? 

Comments

  • Hi,

    After doing the binary math I see that your answer is correct : 

     

    1010 1100  0001 0000 0110 1011 00000000

    1100 0000 1010 1000 0000 0010 00000000

    1100 0000 1010 1000 0000 0011 00000000

     

    —————————————————————————————

     

    10000000 00000000 00000010 00000000 = > 128.0.2.0 

     

    01101100 10111000 01101001 0000 0000 = > 108.184.105.0

     

    The grading script could do smth similar to this : 

    show ip rou eigrp | i IP_ADD_OF_R8

    check output vs the 3 subnets

    Or depeding on the restrictions, probably that a scenario like this would be graded just by matching the output of sh access-list X.

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