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Computer Networks & OS Interview Questions & Answers

OSI model, TCP/IP, process vs thread, virtual memory, paging, and deadlocks.

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What conditions are necessary for deadlock, and how can software avoid it?

The classic necessary conditions are mutual exclusion, hold-and-wait, no preemption, and circular wait. A program can reduce deadlock risk by breaking a condition, for example acquiring multiple locks...

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A service name resolves correctly but connections time out. How would you investigate?

Confirm the resolved address and port, then test reachability from the affected client environment. Inspect routing, security groups or firewall rules, service binding, load-balancer health, and wheth...

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How does a TCP connection differ from an application-level session?

TCP provides an ordered, reliable byte stream between endpoints while the connection is viable; it does not define user identity, messages, or login state. An application session represents higher-lev...

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Why can adding more threads make a CPU-bound service slower?

When runnable threads exceed useful CPU capacity, scheduling, context switching, cache disruption, and lock contention can outweigh any parallelism benefit. Shared data may also cause cache-coherence ...

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