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Prepare top Computer Networks interview questions with answers covering OSI model, TCP/IP, IP addressing, subnetting, routing, TCP vs UDP, DNS, HTTP, and network security basics. Use this page as a focused learning resource for computer networks concepts, interview preparation, and practical revision.
Computer Networks is one of the most practical interview subjects because almost every modern system communicates over a network. Even if you are not applying for a dedicated networking role, you are still expected to know how applications exchange data, how the internet works, and what protocols are involved.
This page is built for short-answer revision and placement preparation.
A computer network is a collection of interconnected devices that communicate and share data and resources through communication links and protocols.
The OSI model is a seven-layer reference model used to explain network communication.
Layers:
TCP/IP is the practical internet communication model. Its layers are:
An IP address is a logical address used to identify a device on a network.
Subnetting divides a network into smaller sub-networks for better address use, traffic control, and management.
A MAC address is a physical address assigned to a network interface card. It is mainly used at the data link layer.
Routing is the process of selecting the best path for data packets to travel from source to destination.
TCP is a connection-oriented transport protocol that provides reliable, ordered, and error-checked communication.
UDP is a connectionless transport protocol that is faster and lighter but does not guarantee delivery.
DNS stands for Domain Name System. It converts domain names like google.com into IP addresses.
HTTP stands for HyperText Transfer Protocol. It is used for communication between browser and web server.
HTTPS is the secure version of HTTP. It uses encryption to protect communication.
The transport layer provides end-to-end communication, reliability, segmentation, and flow control.
Flow control ensures that the sender does not send data faster than the receiver can handle.
Congestion control prevents the network from becoming overloaded when traffic is very high.
A firewall is a security system that monitors and controls incoming and outgoing network traffic based on rules.
NAT stands for Network Address Translation. It allows multiple devices in a private network to share a public IP address.
Networking answers become stronger when you attach one real-world example. For example, while explaining DNS, mention that it translates website names into IP addresses so the browser can reach the correct server.
OSI model, TCP/IP, IP addressing, subnetting, routing, TCP vs UDP, DNS, HTTP, and basic security concepts are the most important networking interview topics.
Yes. Computer Networks is frequently asked in technical interviews, especially for software engineering, backend, support, cloud, and infrastructure-oriented roles.
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