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Delhi Metro Rail Corporation Interview Questions and Answers

Updated 14 Oct 2024

Q1. What is rsync in linux?

Ans.

rsync is a command-line tool for syncing files and directories between two locations on a Unix-like system.

  • rsync stands for remote sync.

  • It can be used to copy files locally or between a local and remote system.

  • rsync only transfers the differences between source and destination files, making it efficient for large transfers.

  • It can preserve permissions, timestamps, and other file attributes during synchronization.

  • Example: rsync -avz /path/to/source/ user@remote:/path/to/destina...read more

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Q2. What is load balancing

Ans.

Load balancing is the process of distributing network traffic across multiple servers to ensure optimal resource utilization and prevent overload.

  • Load balancing helps improve the performance, reliability, and scalability of applications by evenly distributing incoming traffic.

  • It can be achieved through various methods such as round-robin, least connections, IP hash, and weighted round-robin.

  • Examples of load balancing solutions include hardware load balancers like F5 Networks,...read more

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Q3. Difference in udp and tcp

Ans.

UDP is connectionless and faster, while TCP is connection-oriented and reliable.

  • UDP stands for User Datagram Protocol, while TCP stands for Transmission Control Protocol.

  • UDP is connectionless, meaning it does not establish a connection before sending data, while TCP is connection-oriented and establishes a connection before data transfer.

  • UDP is faster but less reliable as it does not guarantee delivery of packets, while TCP is slower but ensures reliable delivery through erro...read more

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Q4. 10 linux commands

Ans.

Common Linux commands for system administrators

  • ls - list directory contents

  • cd - change directory

  • pwd - print working directory

  • cp - copy files and directories

  • mv - move or rename files and directories

  • rm - remove files or directories

  • grep - search text patterns

  • chmod - change file permissions

  • ps - display information about running processes

  • top - display and update sorted information about processes

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