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Tech Mahindra · Computer Networks
Practice Computer Networks questions specifically asked in Tech Mahindra interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
8
Tagged for this company + subject
Company
Tech Mahindra
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 Tech Mahindra Computer Networks round.
Modulation is used to encode digital or analog data onto a carrier signal by varying its amplitude, frequency, or phase. It allows data to travel efficiently over long distances and makes better use of the available bandwidth. Common techniques include AM, FM, and PM.
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A WAN connects multiple local area networks over a wide geographic area using leased lines or satellites. The Internet itself is the largest WAN. Interviews often test your ability to distinguish LAN, MAN, and WAN by scale and technology.
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.
UDP sends data directly without establishing a connection. This reduces delay and overhead, making it ideal for time-sensitive applications like video streaming or gaming. However, reliability and ordering are left to the application.
In Go-Back-N, if a frame or acknowledgment is lost, the sender goes back and retransmits that frame and all subsequent ones. It’s simpler to implement but less efficient than Selective Repeat, which retransmits only the missing frames.
The Routing Information Protocol (RIP) uses hop count to determine the shortest path. The maximum allowed hops are 15, meaning larger networks are unsuitable for RIP. Despite its limitations, RIP is widely used in small and academic networks.
Routing metrics quantify route desirability using parameters like hop count, delay, bandwidth, or load. MAC address length is not relevant for routing decisions since it belongs to the Data Link Layer.
An ad hoc network is self-organizing, where devices connect directly to each other to exchange data without relying on routers or access points. It’s useful in temporary or emergency setups like disaster recovery operations.