The core-CS concepts interviewers keep returning to — deadlocks, normalisation, indexing, the TCP handshake — distilled into a one-sitting revision.
Technical interviews lean on three subjects again and again: operating systems, databases, and computer networks. You do not need everything — you need the concepts that get asked.
Operating systems
- Process vs thread, and why threads share memory.
- Deadlock — the four Coffman conditions and how to break one.
- Scheduling — FCFS, SJF, Round Robin, and their trade-offs.
- Paging vs segmentation, and what a page fault is.
DBMS
- Normalisation — 1NF → 3NF with a concrete example; when denormalising is fine.
- ACID properties, explained in one line each.
- Indexing — why it speeds reads and slows writes; B-tree intuition.
- Transactions and isolation levels.
Computer networks
- The TCP three-way handshake, and TCP vs UDP.
- The OSI layers — at least name them and give one protocol per layer.
- DNS resolution, end to end.
- What happens when you type a URL and press enter — a favourite integrative question.
Revise these out loud; if you can explain each in plain words, you can answer the follow-ups. The prephasz interview prep bundles exactly this checklist.
Put this into practice
Drill these exact patterns with adaptive practice, timed mocks and company-wise assessments on prephasz.
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