Match The Wildcard Mask To The ACL Statement

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| By Dave Cushing

Dave Cushing

Community Contributor

Quizzes Created: 1 | Total Attempts: 769

Questions: 8 | Attempts: 771 | Updated: Mar 20, 2023

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Questions and Answers

1.

Deny all hosts from the 10.10.10.0/24 network
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
C. 0.0.0.255

Explanation
/24 network wildcard mask for all hosts is 0.0.0.255

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2.

Deny host 192.168.5.7
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
A. 0.0.0.0

Explanation
0.0.0.0 will match exactly the complete IP address

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3.

Permit all hosts from the 172.18.15.0/24 network
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
C. 0.0.0.255

Explanation
/24 network wildcard mask for all hosts is 0.0.0.255

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4.

Permit host 10.10.10.1
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
A. 0.0.0.0

Explanation
use 0.0.0.0 to match a single host IP address

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5.

Permit all hosts from the 10.0.0.0/8 network
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
E. 0.255.255.255

Explanation
0.255.255.255 will match an entire /8

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6.

Deny host 172.18.33.1
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
A. 0.0.0.0

Explanation
0.0.0.0 is a single host match for permit and deny ACLs

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7.

Permit all hosts from the 192.168.5.0/27 subnetwork
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
B. 0.0.0.31

Explanation
255.255.255.255 - 255.255.255.224 = 0.0.0.31 (subtract the subnet masks)

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8.

Deny all hosts from the 172.18.0.0/16 network
- A.
  
  0.0.0.0
- B.
  
  0.0.0.31
- C.
  
  0.0.0.255
- D.
  
  0.0.255.255
- E.
  
  0.255.255.255
Correct Answer
D. 0.0.255.255

Explanation
Match the last two octets, so the wildcard is 0.0.255.255

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Match The Wildcard Mask To The ACL Statement

Deny all hosts from the 10.10.10.0/24 network

Deny host 192.168.5.7

Permit all hosts from the 172.18.15.0/24 network

Permit host 10.10.10.1

Permit all hosts from the 10.0.0.0/8 network

Deny host 172.18.33.1

Permit all hosts from the 192.168.5.0/27 subnetwork

Deny all hosts from the 172.18.0.0/16 network