Top 70 Linux Interview Questions 2024

They want to know if you have the technical knowledge to configure, secure, and maintain a server, as well as if you are familiar with the best practices for setting up a server. Additionally, they are looking to see if you have the problem-solving skills to troubleshoot any issues that may arise. Linux engineers need to be familiar with scripting languages, as they are used to automate tasks and create tools that can be used to maintain and manage Linux systems. The interviewer wants to know what experience you have with these languages and how you have used them in the past. This will give them an idea of your technical skill level and how comfortable you are with using scripting languages.

  1. Many times there is a need to share a program across different virtual desktops.
  2. Furthermore, deleting a soft link leaves the target file or directory untouched, whereas hard links keep the data accessible as long as at least one hard link exists.
  3. The wavelength division multiplexing is commonly used in fiber optic links.
  4. To ping an IP address in Linux, you can use the “ping ip address” command.
  5. For example, if we say I have a password for my Gmail account but someone saw it while I was doing login into my Gmail account.

Which in turn means that market demands, everyone should have the basic knowledge of Networks and Networking. If you see that one of your interfaces does not have an IP address, then that is likely the cause of your networking problem. To ping an IP address in Linux, you can use the “ping ip address” command.

The ps command displays brief information about the running processes. You can use the ps -f or ps -f command because the -f option shows the full-format result, and the -e option displays all processes. Moreover, you can use the ps auxf command to get a detailed list of processes. It loads the Linux operating system into memory and starts the execution. Most operating systems like Windows and macOS come with a bootloader. While in Linux, you need to install a separate boot loader, and LILO is one of the Linux boot loaders.

These questions are useful for the fresher as well as the experienced candidates. Here are the top command-based interview questions and answers that are asked in a Linux interview. Just go through these questions at the time of last minute interview preparation, and you will be able to crack the Linux interview very easily. Here is a list of kernel-based Linux interview questions and answers that will let you understand what is Linux Kernel, its types and you can do Linux interview preparation. These are the questions that are normally asked in Linux interview.

Is there any relation between the modprobe.conf file and network devices?

If necessary, manually start Nginx with verbose debugging (‘nginx -g “daemon off;”‘) to pinpoint specific issues preventing startup. Additionally, investigate DNS logs in ‘/var/log’ for errors and employ ‘systemctl’ to troubleshoot or restart the DNS resolver service. Since /proc contains virtual files, it is called a virtual file system. Virtual files such as /proc/interrupts, /proc/meminfo, /proc/mounts, and /proc/partitions provide an up-to-the-moment glimpse of the system’s hardware. Others, such as the /proc/filesystems file and the /proc/sys/ directory, provide system configuration information and interfaces. The Linux shell is software that serves as a user interface between the user and the kernel.

Combining predictive monitoring, scaling up resources, moving workloads to cloud, and archiving old data are key capacity strategies. This summarizes size metrics in order, great for confirming expectations or identifying outliers. ‘wc’ can also accept input pipes and multiple files at once for convenient aggregation.

If you’re not as experienced, explain that you are familiar with the basics and have been learning more about it on your own or through a course. Be sure to emphasize your willingness to learn and your interest in mastering the command line. Linux is a popular operating system, and as a Linux engineer, you’ll need to be familiar with the different distributions of it. Knowing how to install, configure, and maintain various Linux distributions is essential for this job. This question will help the interviewer gauge your experience and skill level with the different distributions of Linux.

In conclusion, Linux is a powerful operating system with a wide range of features and capabilities. Knowing the answers to common Linux interview questions is an essential part of preparing for a job in the field. We hope that this list of 101 Linux interview questions has helped you in your preparation for your next job interview. This is an important question to consider when interviewing for a job in Linux networking.

Moreover, if there is a program that is named LS, then entering the LS command will execute it rather than listing all files in the directory. Replace `username` with your actual username on the remote server and `remote_server_ip` with the IP address or domain name of the remote server. – The `/etc/hosts` file is a simple text file that maps IP addresses to hostnames.

What kind of error is undetectable by the checksum?

It specifies the IP addresses of one or more DNS servers to be queried for name resolution. “Sun Java Desktop System,” or “Java Desktop System” for short, was the name of the Linux release that Sun Microsystems made. Sun Microsystems created an operating system that was based on Linux. A Latch is a temporary storage device controlled by timing signal which can either store 0 or 1. A Latch has two stable states (high-output or 1, and low-output or 0) and is mainly used to store state information. This command will print the count of the word “linux” in the “interview.txt” file.

Can IP Multicast be load-balanced?

It serves as a local DNS lookup table for the system, allowing users to define hostname-to-IP address mappings without relying on external DNS servers. Swap Space is the additional spaced used by Linux that temporarily holds concurrently running programs when the RAM does not have enough space to hold the programs. When you run a program, it resides on the RAM so that the processor can fetch data quickly. Suppose you are running more programs than the RAM can hold, then these running programs are stored in the Swap Space.

In this article, we’ve compiled a comprehensive list of Linux interview questions that cover a wide range of topics. If you are having networking problems in Linux, the first thing you should do is check your network status using the ifconfig command. This command will show you all of the network interfaces that are currently active on your system as well as their IP addresses. The ‘iptables’ command is used to configure the firewall rules on a Linux system. It can be used to allow or block traffic based on various criteria, such as IP addresses, protocols, and ports.

What are the different run levels in Linux?

Gain insights into network protocols, routing, security, and more, as you navigate through detailed answers crafted to deepen your expertise in Linux networking. We hope you found this article on linux networking interview questions interesting and informative. Download the Testbook Skill Academy app now and get ready to learn 21st-century skills. Process scheduling is the mechanism that identifies the order of processes running on the system.

Network Address Translation (NAT) is a technique used in networking to modify the source or destination IP address of packets as they pass through a router or firewall. NAT is often used in private networks to allow devices with private IP addresses to communicate with devices on the public Internet. Network bonding is typically used in high-availability environments, such as servers and network appliances, to ensure network connectivity and prevent network downtime. A Linux network administrator is responsible for managing and maintaining the network infrastructure of a Linux-based system. They are responsible for configuring and managing network services, monitoring network performance, troubleshooting network issues, and ensuring network security. A firewall is a network security system that filters and controls network traffic.

Cluster technologies like Pacemaker and Corosync are some of the existing high-availability solutions in Linux that help to guarantee constant service delivery. Traffic distribution among many servers is enhanced through load-balancing systems such as HAProxy, thus ensuring no single point for failure. Tools like Keepalived also enhance IP failover, hence increasing linux networking interview questions reliability. Analyzing system logs in Linux involves using tools like ‘journalctl,’ which displays logs from the journal. ‘dmesg’ shows kernel-related messages, ‘tail’ allows real-time log monitoring, and ‘grep’ aids in searching logs for specific patterns. Centralized logging solutions like ‘syslog-ng’ or ‘rsyslog’ can aggregate logs for easier analysis.

In other words, process scheduling determines the order and execution time of multiple processes running on the system concurrently. This process scheduler of Linux is priority-based and uses a preemptive algorithm. It allocates CPU time for different processes to ensure efficient CPU resource usage. These processes are dynamic, and their order can change depending on many factors, such as resource usage, process behavior, and scheduling policies. Pinpointing sluggish Linux database servers begins with system monitoring using top, htop, and iostat for CPU, memory, and disk resources.

The Linux kernel tracks the resources and provides a user interface. Hence, learning interview questions can benefit you in competitiveness, interview success, confidence-building, and many more. If you are also preparing for a job in the Linux field, the following questions will surely benefit you.

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