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Infosys · Computer Networks
Practice Computer Networks questions specifically asked in Infosys interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
9
Tagged for this company + subject
Company
Infosys
View company-wise questions
Subject
Computer Networks
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Go through each question and its explanation. Use this page for targeted revision just before your Infosys Computer Networks round.
A protocol is a formal set of rules and standards that define how data is transmitted, formatted, and received across a network. Examples include HTTP, FTP, TCP, and IP. Protocols ensure that devices from different vendors can communicate effectively.
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A computer network connects two or more computing devices so they can exchange data, share resources, and communicate efficiently. Networks can be small like a home LAN or large like the Internet, but the basic goal remains collaboration and resource sharing.
In twisted pair cables, each pair of wires is twisted together to reduce electromagnetic interference from nearby cables or external sources. The twisting ensures that interference affects both wires equally, allowing the receiver to cancel it out. This makes it a cost-effective and widely used medium for LANs.
The Physical Layer is responsible for the actual transmission of raw bits over a communication channel. It defines electrical, optical, and mechanical characteristics such as voltage levels, pin configurations, data rates, and cable types. This layer ensures that bits are physically moved from one node to another.
The Network Layer is responsible for moving packets from the source to the destination across multiple networks. It provides logical addressing (like IP addresses) and selects routes based on algorithms. This layer makes internetwork communication possible.
The Data Link Layer ensures reliable transfer of frames between two nodes connected by a physical link. It groups bits into frames, adds headers and trailers, detects errors, and sometimes handles retransmission. This layer bridges the gap between the raw transmission of bits and structured network communication.
Flow control ensures that a fast sender does not overwhelm a slower receiver with too much data. It uses mechanisms like Stop-and-Wait and Sliding Window to coordinate data flow. Proper flow control avoids data loss and buffer overflow.
In Link State Routing, routers discover their neighbors, measure link costs, and flood this information to all other routers. Each router builds a full map of the network and computes the shortest paths using Dijkstra’s algorithm. It converges faster and is more scalable than distance vector routing.
FTP allows users to upload and download files from remote servers using separate control and data connections. It supports authentication and directory operations, making it useful for sharing large datasets or website maintenance.