Our expert-curated list of network troubleshooting interview questions and answers will help you prepare for the toughest technical topics, such as DHCP, DNS, IP addressing, subnetting, routing protocols, network topology, traffic routing, and more. Get ready to demonstrate your network troubleshooting skills and land your network engineer job by facing the interview.
Network troubleshooting is an important skill for any IT professional to have. It involves identifying, analyzing, and resolving network issues, ensuring that a network remains functioning properly.
Having a good grasp of the common network troubleshooting interview questions and possible answers can help you stand out among the competition and make a great impression. We have divided the interview questions into 3 sections below
Top 10 Network Troubleshooting Frequently Asked Questions
Network troubleshooting is a methodical process that aims to troubleshoot problems and get the network working normally again within the parameters and network. Troubleshooting of a network can be performed manually or automatically.
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A network is formed by connecting two or more devices so that they may exchange data. A network can be divided into subcategories based on its size, number of nodes, types of connections, functional links, topology, and purpose.
Troubleshooting is the process of finding a problem, error, or fault in the software, a computer system, or any other device, making a plan to troubleshoot it, and putting the plan into action. It is possible to fix and restore a computer or software that is broken, won't work, or is acting strangely.
Troubleshooting fixes a faulty system or application. It's a strategy with one or more steps, depending on the situation. First, identify the problem, then create a solution, and finally implement it.
When it comes to networks, there are a few distinct kinds of cables that are typically used:
Verify that a system set up on the network can communicate with the DHCP server using an IP address. Verify that both the DHCP server and the DHCP client have their respective services started. Using Nmap, verify if the DHCP server can be accessed.
The three steps to troubleshoot problems with an FTP server are:
The following are the frequent problems with networks:-
Before you try to fix a problem, make sure you know what it is, how it happened, whom it affects, and how long it has been going on. Instead of wasting time on fixes that don't work, you'll have a much better chance of quickly troubleshooting the problem if you gather the necessary information and explain what's going on.
The steps to network troubleshooting are
Exclusive usage of private IP addresses is permitted within private networks.
These IPs are reserved for private intranets and are not reachable from the wider Internet. This prevents any internal network conflicts from occurring. Concurrently, since intranets cannot "see" each other, the same pool of private IP addresses can be used for several different ones.
This command is often used for incoming and outgoing connections, listening ports, routing tables, and tracking how often a program is used.
Using the Netstat command, you can make graphs that show statistics about networks and protocols. In the form of a table, you can see the status of TCP and UDP endpoints and the routing table and interface information.
Instead of routing, sharing addresses makes things safer. This is because private IP addresses on the internal network are not visible to host PCs on the Internet; only the public IP address of the external interface on the computer does address translation.
There are four primary layers in TCP/IP:
The IPCONFIG command shows the IP address information for a computer. From the output, we can find the IP address, DNS IP address, and gateway IP address given to the computer.
You can get a new computer and load it with the latest OS and antivirus programs. Then, add the contaminated HDD to the computer as an additional disc. The backup HDD should then be wiped and scanned. The data migration to the new platform can now begin.
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Network topology is how the devices or nodes of a network (like printers, computers, hubs, servers, routers, switches, Etc.) are connected to each other over a communication medium.
It has two parts:
The key difference between a workgroup and a domain is that network administrators in a domain utilize servers to administer all of the computers that are part of the domain.
However, in a workgroup, no one computer has authority over another computer in the group. In addition, devices that are part of a domain might be connected to a number of different local networks, but in a workgroup, all of the devices are members of the same local area network (LAN) or subnet.
If something like this happens, an administrator needs to analyze the issue by looking at the log files named vmware.log and hostd.log.
The hostd.log log files explain the agent that maintains and configures the ESXi host and virtual machines.
The Vmare.log log files keep track of the activity on the ESX host and the virtual machines it hosts.
Several of the following can contribute to network-related problems:
Encryption is the procedure of transforming data into unintelligible code. The data is encrypted and then translated to its original format using a password or secret key.
During a mid-stream interception, encrypted data would still be inaccessible without the appropriate password or key.
If you're having issues with your FTP server, here are the three things you should try:
The seven levels that make up the OSI reference models are listed below:
If we are unable to communicate with the IP address of the destination and the TCP/IP protocol suite does not reveal a path to the next hop from any point in the network, we will make use of the PING and TRACEROUTE troubleshooting tools to determine the nature of the issue and its geographical origin.
Here are some general steps for troubleshooting IP network problems that have to do with:
There are four main categories of networks. Let's analyze each one separately.
Logical Address: It's called an Ip Address (IPv4 -32 bit & IPv6 -128 bit)
Physical Address: It's called a MAC Address (48-bit)
Specifying a network's identity is known as the subnet mask.
The maximum length for a single section of UTP cable can be installed between 90 and 100 meters. By using repeaters and switches, it is possible to circumvent this limitation.
A protocol consists of three essential parts:
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Automatic private IP addressing is the acronym for this APIPA system.
Whenever a Dynamic Host Configuration Protocol (DHCP) server is not accessible, Windows clients automatically assign themselves IP addresses. IPv4 APIPA is the name given to this particular address. Hosts with IP addresses between 169.254.0.0 and 169.254.255.255
Firewall: A firewall prevents unauthorized users from entering a protected network. Malware such as viruses, spyware, and adware can easily be installed and has no defenses.
Antivirus: An antivirus program is designed to ward off any malware, adware, or viruses that might try to infiltrate your computer. These are both networking security applications.
Here are the five different ranges of Internet addresses:
Secure HTTP is HTTPS. HTTPS is used to send and receive information over a computer network safely. HTTPs give websites authentication, which keeps unwanted attacks from happening.
Port 443 is used by TCP for HTTP. When two people are conversing back and forth, the HTTPs protocol encrypts the discussion so that the data can't be modified. With the help of an SSL certificate, it checks to see if the connection to the server that was asked for is reasonable.
The localhost or loopback address is 127.0.0.1. These systems are often only accessible to the largest clients or the Internet's founding members. Pinging the server to see if it responds is the first step in diagnosing connection problems.
There could be many reasons why the server isn't responding, such as a malfunctioning network, faulty wiring, or a malfunctioning network card. Pinging 127.0.0.1 indicates that the hardware is functioning properly because it is a loopback connection on the NIC.
With most network operations, 127.0.0.1 and localhost refer to the same thing.
They both use TCP/IP technology, but the level of access each user has inside and outside of the network is different.
In computer networks, there are three different ways that data can be sent. Here is a list of them,
Ghost Imaging is a software-driven backup method commonly referred to as cloning. The contents of a hard disc are copied to another server in the form of a single compressed file or an image, a collection of files. It can also return a ghost picture to its initial condition if required. It is typically applied while reinstalling an operating system.
Memory, central processing unit (CPU), and network utilization can be evaluated using the ESXTOP tool. VMware administrators will find it a beneficial tool when dealing with performance difficulties.
To configure ESXTOP, you will require the vSphere Client and putty and SSH sessions. To evaluate the performance of the CPU, we utilize the counters percent MLMTD, RDY, and CSTP.
A network's performance efficiency can be affected by the following:
There are two different types of networks available they are:
The simple file transfer protocol (TFTP) describes a local host retrieving data from a remote host. It takes advantage of the standard packet delivery features of UDP. However, it is unreliable and lacks security.
TCP/IP often provides the File Transfer Protocol to transfer data between hosts (FTP). Because it takes advantage of TCP's facilities, it is dependable and safe. Two connections are established between the hosts: one for command and control information and another for actual data transfer.
Class A, B, and C, IP addresses can be determined by inspecting the address's first octet. Class A addresses have a leading zero bit in the first octet. Class B addresses start with the bit position 10. When the prefix is 110, you know you're dealing with a Class C system.
The primary purpose of proxy servers is to prevent users from the outside world from identifying the IP addresses of a private network. Even the physical location of the network can only be determined if the correct IP address can be provided. Proxy servers can render a network almost completely invisible to users outside it.
Network troubleshooting is a repeatable process, it can be broken down into simple steps that anyone can follow.
The ICMP ping tool is a basic network troubleshooting tool that allows you to determine whether or not a device is reachable on the network. It logs errors such as packet loss, round-trip time, and so on.
The top 10 common network issues are as follows:
The ping command is frequently used to troubleshoot network problems. The command issues ICMP echo requests to the host or the destination. The system calculates the response time and displays the results after the host sends ICMP packets in response.
Simply enter the ping command in the command prompt on a Windows system, followed by the hostname or URL. Enter the same command in the terminal for Linux systems. Remember that the command syntax is as follows:
Syntax: ping hostname
The steps to troubleshoot TCP/IP issues are as follows.
Step 1: Check the configuration
Step 2: Networking traces
Step 3: Ping the computer's local IP address
Step 4: Troubleshoot error messages that appear during the ping or telnet test.
Step 5: Telnet or Ping to the default gateway
Step 6: Check issues that relate to the particular destination node
Some of the causes of network failures are as follows.
The three types of troubleshooting are
Start studying these essential network troubleshooting interview questions today and get one step closer to acing your next interview!
If you want to impress hiring managers that you are the best candidate for the position of network troubleshooter, you may sign up for the CCNA Training and Certification to get more prepared for the interview.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .
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