Neco 2023 Computer Studies Question 42

Practice objective / multiple choice question 42 from the 2023 Neco Computer Studies examination.

Neco 2023 Computer Studies Objective / Multiple Choice Medium Difficulty
Question 42 NECO • 2023 • COMPUTER_STUDIES • objective

A company has been allocated the Class B network 172.16.0.0/16. It needs subnets for five departments requiring 120, 60, 30, 12 and 6 host addresses respectively. Using Variable Length Subnet Masking (VLSM): (a) give the subnet mask (dotted‑decimal) assigned to each department from largest to smallest requirement; (b) compute the total number of unused host addresses across all subnets; (c) state the subnet mask arrangement that yields the minimum total waste while still meeting all requirements.

Answer Options

A. Masks: 255.255.255.128, 255.255.255.192, 255.255.255.224, 255.255.255.240, 255.255.255.0; Total waste: 14 addresses; This arrangement is a sub‑optimal solution.
B. Masks: 255.255.255.128, 255.255.255.224, 255.255.255.192, 255.255.255.240, 255.255.255.248; Total waste: 8 addresses; This arrangement is the minimum‑waste solution.
C. Masks: 255.255.255.128, 255.255.255.192, 255.255.255.224, 255.255.255.240, 255.255.255.248; Total waste: 12 addresses; This arrangement is a low‑waste solution.
Correct Answer D. Masks: 255.255.255.128, 255.255.255.192, 255.255.255.224, 255.255.255.240, 255.255.255.248; Total waste: 10 addresses; This arrangement is the minimum‑waste solution.
Correct Answer
D
Correct Option:
Masks: 255.255.255.128, 255.255.255.192, 255.255.255.224, 255.255.255.240, 255.255.255.248; Total waste: 10 addresses; This arrangement is the minimum‑waste solution.

About This Question

This is Neco 2023 Computer Studies Question 42. It is one of the objective questions from the 2023 Neco Computer Studies examination.

Difficulty level: Medium .

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