Cisco Network Security - Topic: ACL Please help to solve the following questions

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Cisco Network Security - Topic: ACL

Please help to solve the following questions of correct answers, thanks

HDTN/ Name Date: Network Security: Tutorial 4A - ACL Question 1 Find the missing numbers in the following tables of equivalent values: (a) Binary Decimal (b)Bina Decimal 1000 0000 128 1100 0000 127 224 31 1111 0000 0000- 248 0000 0011 254 255 Question 2 Write down the IP range matched by the matching criteria below (a) 217.30.16.51 0.0.0.0: (b) 72.30.16.51 0.0.0.15: (c) 172.30.16.51 0.0.3.255: Question 3 Suggest an ACL wildcard mask that can be used to match all TP addresses from network 217.16.2.0 to network 217.16.3.0: Question 4 A network administrator is configuring the ACL below to limit the access to 192.168.10.0/24 via R1 from network 172.1.20.0/22 to only the IT group workstations in the subnet 172.1.22.0/24 RI (config)# access-list 120 deny ip 1721 68200 003255 192.168.10.0 0.0.0255 RI (config)# access-list 120 permit ip 172.16822 0 0 0,0 255 192 168 10 0 0 0.0255 R1 (config)# access-list 120 permit ip any any However, after the ACL is applied, access to 192.168.10.0 from the IT group workstations are denied (a) What is the address range denied with 172.168.20.0 0.0.3.255? (b) How to fix the problem?

Explanation / Answer

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1)
a)
Binary Decimal
0000 0000 0
1000 0000 128
1100 0000 192
1110 0000 224
1111 0000 240
1111 1000 248
1111 1100 252
1111 1110 254
1111 1111 255

b)
Binary Decimal
1111 1111 255
0111 1111 127
0011 1111 63
0001 1111 31
0000 1111 15
0000 0111 7
0000 0011 3
0000 0001 1
0000 0000 0

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