110+ Killer Networking Interview Questions and Answers 2025 Edition

One can use this command to test both the computer name and IP address of the computer. A daemon is a background process that runs independently of user sessions. It is typically started at system boot time and performs system tasks or provides services.

Q17. What is the purpose of the ‘ifconfig’ command in Linux?

This restriction prevents user-level processes from interfering with critical system operations. I use ip addr show (or ifconfig on older systems) to check IP addresses and interface status. Ip route show displays the routing table, and ss or netstat shows active network connections and listening ports. The Linux kernel is the core of the OS, managing hardware, processes, memory, and I/O.

To configure a DNS server, edit the /etc/named/named.conf.options or /etc/named.conf file. Here, you specify the server zone information and options for name resolution to configure how the server resolves DNS queries. These differences are often explored in Linux interview questions, as they reflect a candidate’s grasp of system architecture and performance capabilities.

Which TCP/IP protocol is generally used to remove terminal connection service. The command that is used to review boot messages is the “dmesg” command. The command that is used to count the number of characters in a file in Linux is “wc”. It is used to count the number of lines, words, and characters in a text file. The first process started by the kernel in Linux is “init” and its process id is 1. Zombie Process, also referred to as a defunct or dead process in Linux, is a process that has finished the execution, but its entry remains in the process table.

• Most of the computer in this century is on network of one kind or other.
• By the end, you’ll have a solid understanding of fundamental and advanced networking concepts, plus the confidence to answer interview questions clearly and professionally.
• Linux uses this extra space to hold concurrently running programs temporarily.
• It is considered one of the most basic and most used commands in Linux.
• In linxux we can simply use `-R` option with the `cp` command to recursively copy the file and directories.
• L1 Support is the First-line support or helpdesk support in which we handle basic user inquiries and technical issues.

How do you check resources usage?

However, there’s no guaranteed success, especially if you have written new data over deleted files. Managing disk space is a core topic in Linux and is often discussed in Linux interview questions, particularly in system administration roles. A Linux system may run out of memory due to excessive memory usage by running processes, large data sets that require high memory, improper memory allocation, or memory leaks.

A Linux system engineer is responsible for creating computer applications and programs through the Linux operating system. Linux system engineers design technical model solutions that would improve the efficiency of operational processes and maximize the staff’s productivity. They also handle the upgrade of network infrastructure, system maintenance, and installment of software updates. An even better option is managing your fleet with a robust IoT management platform that has a proven record of developing and deploying applications with enterprises. Since the Linux System is often integrated with other platforms and systems, you should have a good understanding of scripting languages like Python or Perl for automation and tooling.

Yard Supervisor Interview Questions and Answers

Note that the answers here are succinct and you want to study further if you are not familiar with a topic. This list is of course not exhaustive but it will give you an idea of what to expect in most initial interviews. Important for understanding how processes inherit settings and how the shell environment is configured.

SELinux was developed to improve the security policies to prevent unauthorized access and exploitation. However, learning about SELinux is essential before working on it can create serious security issues. The df or disk-free command shows the used and the available disk space. For instance, you can use the df -h command to check the disk usage in the human-readable format.

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• It implements mandatory access control (MAC) policies, providing an extra layer of security by restricting processes’ abilities based on defined policies, beyond standard Linux permissions.
• In all the cases, transparent bridges flooded the broadcast and multicast frames.
• To create a Linux partition, start by using the command sudo fdisk /dev/sdX, replacing sdX with the appropriate disk identifier.
• Employers want to know that potential employees can establish and maintain secure connections in a networked environment.
• Checks understanding of system initialization states and how to control them, relevant for boot processes and troubleshooting.
• It is also regarded as a control and information center for the kernel.

I often use tar to create compressed archives, like tar -czvf backup.tar.gz /path/to/files. For automated or incremental backups, rsync is very useful, allowing efficient synchronization of files and directories locally or over the network. Relevant for security-focused roles or environments using Red Hat-based distributions. A kernel module is a piece of code that can be loaded into or unloaded from the kernel while it’s running. This is commonly used for device drivers or filesystem support, allowing the kernel to be extended without needing to reboot.

In Linux, directories are separated by a forward slash (“/”), linux networking interview questions and file names are case-sensitive. Linux is a leading open-source operating system known for its security, flexibility, and community-driven development. Launched in 1991 by Linus Torvalds, it supports multitasking and multi-user operations, making it ideal for various applications, from servers to personal computers.

This command will display the routing table, including the destination network, netmask, gateway, and other information. TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two primary communication protocols used in networking. They differ mainly in reliability and speed, with each serving specific use cases based on these attributes. Mastering the use of iptables is often featured in Linux interview questions related to network security and system administration. The scheduling process is typically priority-based, where each process is assigned a priority level, and higher-priority processes are given preference for CPU time. The scheduler can switch between processes, known as context switching, to optimize performance and responsiveness.

Why Bandwidth is important to network performance parameters?

It enables dynamic storage allocation, allowing users to efficiently manage and allocate disk space across physical storage devices. The rsync command is a powerful utility in Linux for synchronizing and transferring files between two systems, directories, or networks. It efficiently copies and syncs files and directories while preserving file permissions, ownership, and timestamps. The utility is especially useful for backups, mirroring, and maintaining the integrity of files during transfer.

From TCP/IP fundamentals to network configuration and troubleshooting, this resource covers a wide range of topics essential for mastering Linux networking. Whether you’re a seasoned professional or preparing for an interview, delve into this guide to strengthen your knowledge and ensure success in Linux networking discussions. Gain insights into network protocols, routing, security, and more, as you navigate through detailed answers crafted to deepen your expertise in Linux networking. Linux networking is a fundamental skill for many IT professionals, given its widespread use in servers, cloud environments, and enterprise networks. The open-source nature of Linux, combined with its robust networking capabilities, makes it a preferred choice for many organizations. Configuring network interfaces in Linux allows you to set up and manage network connections, whether wired (Ethernet), wireless (Wi-Fi), or virtual.