Connect with fellow learners in the PlacePrep Discord communityㆍ Join now →

R's PlacePrep

Popular drives

TCSNQT (National Qualifier Test)InfosysIRT (InfyTQ Recruitment Test)AccentureCognitive & Technical Assessment

Also hiring

WiproNLTH (National Level Talent Hunt)CognizantGenC Assessment CapgeminiGame-Based Assessment

Browse all 14 companies TCS NQT 2026

Real placement papers from the drives you are actually sitting for

14 companies · 48 papersStart practising

Select your branch

Computer Science & EngineeringBEU previous year papers and solutions Mechanical EngineeringBEU previous year papers and solutions Electrical & Electronics EngineeringBEU previous year papers and solutions

More branches

Civil EngineeringBEU previous year papers and solutions Aeronautical EngineeringBEU previous year papers and solutions

All branches Computer Science

Previous year questions

University papers, sorted by subject and year with worked solutions

BEU Solved PapersOpen the archive

Core CS

Data Structures & AlgorithmsComplexity analysis up to graphs and DP.Operating SystemsProcesses, scheduling, memory and concurrency.Database Management SystemsRelational modelling, transactions and indexing.Computer NetworksFrom wires and radio waves up to the web.

Learn & scale

AI Inference EngineeringQuantization, batching and KV caching in production.System DesignScalable systems from first principles.Context EngineeringDesigning the context that LLMs actually reason over.Docker & KubernetesContainers and orchestration, explained.

All 15 courses Authors

Structured courses that start at zero and end somewhere useful

15 courses · free foreverBrowse courses

Companies PYQ Learn

Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Framing techniques and CRC, the real error-detection workhorse
Frames, switches, and how a local network delivers mail
Sharing the wire without everyone talking at once
ALOHA and token passing: two more ways to share the channel
ARP, or how a device finds its neighbor's fingerprint
Bridges, and how Ethernet segments get joined without chaos

Network Layer & Routing6

Transport Layer5

Application Layer & The Web4

Wireless, Security & Performance3

Lessons

Contribute, invite only

Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Framing techniques and CRC, the real error-detection workhorse
Frames, switches, and how a local network delivers mail
Sharing the wire without everyone talking at once
ALOHA and token passing: two more ways to share the channel
ARP, or how a device finds its neighbor's fingerprint
Bridges, and how Ethernet segments get joined without chaos

Network Layer & Routing6

Transport Layer5

Application Layer & The Web4

Wireless, Security & Performance3

Learn Computer Networks Data Link Layer

Contribute, invite only

Sharing the wire without everyone talking at once

What happens when two devices try to send at the exact same instant, and the simple rules (CSMA/CD and CSMA/CA) that stop it from becoming chaos.

7 min readUpdated 2026-09-03computer-networksdata-link-layercsma-cdcsma-ca