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Computer Networks & Cloud Computing

Layered thinking plus a short list of cloud service names.

2,100+ MCQs10 topicsWeightage: 10%3 difficulty levels
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Overview

Computer Networks & Cloud Computing rewards students who can draw the OSI/TCP-IP stack from memory and walk up and down it explaining what each layer adds. Expect subnetting arithmetic, TCP vs UDP differences, DNS resolution steps, HTTP vs HTTPS, a handful of routing protocols, and the cloud service menu (EC2, S3, Lambda, and their IaaS/PaaS/SaaS categorization). The section is small but scores are often polarized: students either memorize the layer map and clean up, or skim it and lose easy marks.

Why This Subject Matters

Networking is the layer every backend engineer operates on without realizing it. Strong NSCT performance signals to hiring managers that you will not need to be taught why a CORS error happens, what a CDN does, or how a VPC differs from a subnet. That lowers your onboarding cost — and recruiters know it.

Topics in Computer Networks & Cloud Computing

Layered networking

The OSI and TCP/IP stack bottom to top. The core of the section — expect at least one question per layer.

Data CommunicationComputer NetworksData Link LayerNetwork LayerTransport LayerApplication Layer

Wireless, security, cloud

Wi-Fi standards, IaaS/PaaS/SaaS vocabulary, core cloud services, and the security overlay that touches every layer.

Wireless NetworksCloud ComputingNetwork Security (Network Perspective)Next Generation Networks

How to Study This Subject

Draw the OSI and TCP/IP layer diagrams on a single page from memory. Under each layer, list two protocols and one real-world example. Do this twice a week for two weeks and your recall will be automatic. Subnetting practice should be timed — the math is easy but easy to rush under exam pressure.

Suggested time budget

6–8 hours of focused study. Front-load the OSI stack drill; save cloud vocabulary for the final 48 hours.

Common Mistakes to Avoid

  • 1Memorizing port numbers without understanding which protocol they belong to.
  • 2Confusing the order of encapsulation vs decapsulation when data travels up or down the stack.
  • 3Assuming 'cloud' is its own topic separate from networking — NSCT mixes them, and the trap questions depend on you seeing the overlap.
  • 4Missing subnetting edge cases around /31 and /32 prefixes.

Sample Questions

Two example MCQs from the Computer Networks & Cloud Computing question bank, with full explanations. The live quiz draws from 2,100+ verified questions across three difficulty levels.

Network LayerMedium

Q1. A device has IP address 192.168.1.130 with subnet mask 255.255.255.192. What is the network address?

  1. A.192.168.1.0
  2. B.192.168.1.64
  3. C.192.168.1.128✓ Correct
  4. D.192.168.1.192

Explanation

A /26 mask (255.255.255.192) gives 64-host blocks: .0, .64, .128, .192. The address .130 falls into the .128 block, so the network address is 192.168.1.128. The last valid host in this subnet is .190 and the broadcast is .191.

Transport LayerEasy

Q2. Which statement about TCP and UDP is CORRECT?

  1. A.TCP is connectionless; UDP is connection-oriented.
  2. B.TCP guarantees in-order delivery; UDP does not.✓ Correct
  3. C.UDP has flow control; TCP does not.
  4. D.Both protocols require a three-way handshake.

Explanation

TCP is connection-oriented, reliable, and guarantees in-order delivery via sequence numbers and retransmissions. UDP is connectionless, unreliable, and delivers datagrams in whatever order they arrive. Only TCP uses the three-way handshake; UDP has no handshake at all.

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