Match The Wildcard Mask To The ACL Statement

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| By Dave Cushing

Dave Cushing

Community Contributor

Quizzes Created: 1 | Total Attempts: 812

Questions: 8 | Attempts: 812 | 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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Current Version
Mar 20, 2023

Quiz Edited by
ProProfs Editorial Team
Mar 01, 2018

Quiz Created by
Dave Cushing

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