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IP Address & Subnetting Quiz

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Question 1

Refer to exhibit. Which statement explains the configuration error message that is received?

Router(config)#interface GigabitEthernet 1/0/1
Router(config-if)#ip address 192.168.16.143 255.255.255.240
Bad mask /28 for address 192.168.16.143
A.
B.
C.
D.

Question 2

Which function does the range of private IPv4 addresses perform?

A.
B.
C.
D.

Question 3

An office has 8 floors with approximately 30-40 users per floor. What command must be configured on the router Switched Virtual Interface to use address space efficiently?

A.
B.
C.
D.

Question 4

Which goal is achieved by the implementation of private IPv4 addressing on a network?

A.
B.
C.
D.

Question 5

Refer to the exhibit. An engineer must add a subnet for a new office that will add 20 users to the network. Which IPv4 network and subnet mask combination does the engineer assign to minimize wasting addresses?

new_subnet_assignment.jpg

A.
B.
C.
D.

Question 6

Refer to the exhibit. A network technician is asked to design a small network with redundancy. The exhibit represents this design, with all hosts configured in the same VLAN. What conclusions can be made about this design?

IP_Address_wrong_assignment.jpg

A.
B.
C.
D.
E.

Question 7

An engineer must configure a /30 subnet between two routers. Which usable IP address and subnet mask combination meets this criteria?

A.
B.
C.
D.

Question 8

A corporate office uses four floors in a building
* Floor 1 has 24 users
* Floor 2 has 29 users
* Floor 3 has 28 users
* Floor 4 has 22 users

Which subnet summarizes and gives the most efficient distribution of IP addresses for the router configuration?

A.
B.
C.
D.

Question 9

Which network allows devices to communicate without the need to access the Internet?

A.
B.
C.
D.

 

Comments (8) Comments
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  1. knightnight010
    June 22nd, 2025

    An office has 8 floors with approximately 30-40 users per floor. What command must be configured on the router Switched Virtual Interface to use address space efficiently?

    A. ip address 192.168.0.0 255.255.255.224 correct
    B. ip address 192.168.0.0 255.255.0.0
    C. ip address 192.168.0.0 255.255.255.128 wrong
    D. ip address 192.168.0.0 255.255.254.0

    How could the answer possibly be A when it clearly states in question 30-40 users? Obviously you would not have enough adresses for 40 users when you use a /27 mask, I thought that was the whole point of the question.

  2. jorge
    July 2nd, 2025

    knighnight010 is droping facts bro no cap

  3. Sebastian
    August 4th, 2025

    Following question is a bit misleading:

    Refer to the exhibit. An engineer must add a subnet for a new office that will add 20 users to the network. Which IPv4 network and subnet mask combination does the engineer assign to minimize wasting addresses?

    Of course 10.10.225.48/27 is also correct, because it covers the same IP address space; 10.10.225.48 is just not the first subnet within that range. I guess you should make it more clear.

  4. Lambi
    September 13th, 2025

    For knightnight’s question: we are in a class C network so we only have 256 available addresses in total. Divided by 8 floors with equal requirements that leaves us with 8 subnets of the /27 class or .224 mask.

    For Sebastian’s question: 10.10.225.48/27 would go from 10.10.225.48 to 10.10.225.79 as a /27 has 32 IP addresses but the 10.10.225.64/28 subnet already uses the range 10.10.225.64-10.10.225.79

  5. Tigran
    October 2nd, 2025

    ip address 192.168.0.0 255.255.254.0 -correct answer for 1 question

  6. Kevin
    January 30th, 2026

    An office has 8 floors with approximately 30-40 users per floor. What command must be configured on the router Switched Virtual Interface to use address space efficiently?

    A. ip address 192.168.0.0 255.255.255.224 correct
    B. ip address 192.168.0.0 255.255.0.0
    C. ip address 192.168.0.0 255.255.255.128 wrong
    D. ip address 192.168.0.0 255.255.254.0

    How could the answer possibly be A when it clearly states in question 30-40 users? Obviously you would not have enough adresses for 40 users when you use a /27 mask, I thought that was the whole point of the question.

    Please follow up @9tut, /27 wouldn’t be enough for 40 users.

  7. 9tut
    January 31st, 2026

    @Kevin: This question has 2 parts:
    + 8 floors
    + approximately 30-40 users per floor

    We cannot fulfill both with the answers provided. So we can only choose the best answer.
    If you choose .128 then it is not enough for 8 floors.
    If you choose .224 then it is enough for 30 users.
    But we believe “8 floors” is more important than 30 users.

  8. jay
    March 25th, 2026

    i believe that 8 floors question is incomplete

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