100+ IT Engineer Interview Questions and Answers

The interview questions cover a wide range of topics including Active Directory, DNS, RAM, ROM, OSI model, networking devices, LAN/WAN/MAN/PAN troubleshooting, Outlook and Lotus Notes configuration, data backup and recovery, BSOD troubleshooting, and command prompt basics.

• Active Directory is a Microsoft service that manages network resources and user accounts.

• DNS server translates domain names into IP addresses.

• RAM is volatile memory used for temporary storage while ROM is no...read more

The first steps to troubleshoot a computer wifi issue

• Check if the wifi is enabled on the computer

• Restart the computer and the wifi router

• Ensure the computer is within range of the wifi signal

• Check if other devices can connect to the wifi network

• Update the wifi driver on the computer

• Reset the network settings on the computer

A MAC address is a unique identifier assigned to network interfaces for communications on a network. It is 48 bits long.

• MAC address stands for Media Access Control address

• It is a hardware address assigned to network interfaces by the manufacturer

• MAC addresses are used in Ethernet and Wi-Fi networks

• They consist of six groups of two hexadecimal digits separated by colons or hyphens

• Example: 00:1A:2B:3C:4D:5E

A blue screen in Windows indicates a system crash or error.

• Hardware failure

• Driver issues

• Corrupted system files

• Malware or virus infections

• Overheating

• Memory issues

• Power supply problems

Outlook backup can be taken by exporting PST file. PST file location varies based on Outlook version and OS.

• Open Outlook and click on File menu

• Select Open & Export and then click on Import/Export

• Select Export to a file and click on Next

• Select Outlook Data File (.pst) and click on Next

• Select the folder to backup and choose the location to save the PST file

• Click on Finish to complete the backup process

• PST file location can be found by searching for *.pst files on the computer

• In...read more

To check internet connectivity in case Google blog is blocked by company policy, use ping command or test connectivity to other websites.

• Use the ping command to check if the company's network can reach Google's servers

• Test connectivity to other websites like Microsoft, Facebook, or any other popular website

• Check if DNS resolution is working properly by pinging the IP address of Google's blog directly

• Use network diagnostic tools like traceroute or nslookup to identify any netw...read more

Stack is Last In First Out (LIFO) data structure, while Queue is First In First Out (FIFO).

• Stack: LIFO - Last In First Out. Examples: Undo functionality in text editors, function call stack in programming.

• Queue: FIFO - First In First Out. Examples: Print queue, message queue in operating systems.

OSI layer is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system.

• OSI stands for Open Systems Interconnection.

• It has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the adjacent layers.

• Example: Physical layer deals with the physical transmission of data, while the Application layer deals with user interface...read more

To troubleshoot a non-working SMPS, check power connections, test the power supply, inspect for physical damage, and replace faulty components.

• Check power connections and ensure they are properly plugged in

• Test the power supply using a multimeter to check if it is providing the correct voltage

• Inspect the SMPS for any physical damage such as burnt components or bulging capacitors

• Replace faulty components like blown fuses, damaged capacitors, or faulty fans

IP addressing is a method of assigning unique numerical identifiers to devices on a network. There are five classes of IP addressing.

• IP addressing assigns unique numerical identifiers to devices on a network.

• The five classes of IP addressing are A, B, C, D, and E.

• Each class has a different range of IP addresses and is used for specific purposes.

• Class A addresses are used for large networks, with the first octet ranging from 1 to 126.

• Class B addresses are used for medium-sized...read more

Yes, I am able to punch LAN cables. The color codes are: Orange/White, Orange, Green/White, Blue, Blue/White, Green, Brown/White, Brown.

• I am familiar with T568A and T568B wiring standards

• I know that the color codes are used to identify the wires in the cable

• I can use a cable tester to ensure that the cable is properly wired

• Examples of color codes: Orange/White wire is for pin 1, Orange wire is for pin 2, Green/White wire is for pin 3, etc.

I will prioritize resolving the issue and communicate with users to keep them informed.

• I will remain calm and professional while addressing the issue.

• I will prioritize resolving the issue as quickly as possible.

• I will communicate with the users to keep them informed of the progress.

• I will escalate the issue to higher authorities if necessary.

• I will document the issue and the steps taken to resolve it for future reference.

In case of server failure without physical interaction, remote troubleshooting and diagnostics can be performed to identify and resolve the issue.

• Access the server remotely using a management console or remote desktop software.

• Check system logs and error messages to identify the root cause of the failure.

• Perform diagnostic tests to determine if the issue is hardware-related or software-related.

• Restart the server or specific services if necessary to attempt to resolve the issu...read more

Program to move all zeroes in an array to the end

• Loop through the array and check for zeroes

• If a zero is found, remove it from its current position and append it to the end of the array

• Repeat until all zeroes are moved to the end

To find out windows versions, use the 'winver' command or check the system properties.

• Use the 'winver' command in the Run dialog box

• Check the system properties in the Control Panel

• Use the 'systeminfo' command in the Command Prompt

• Look for the version number in the About section of the Settings app

The minimum voltage in RAM is 1.35V for DDR3 and 1.2V for DDR4.

• DDR3 RAM has a minimum voltage of 1.35V

• DDR4 RAM has a minimum voltage of 1.2V

• Lower voltage RAM can help reduce power consumption and heat generation

Troubleshooting steps for a PC that won't turn on

• Check power source and cables

• Check power supply unit

• Check motherboard and CPU

• Check RAM and other components

• Check for any error messages or beeps

• Try booting in safe mode

• Try a different power outlet

• Check for any loose connections

There are several types of operating systems including Windows, macOS, Linux, and Unix.

• Operating systems can be categorized as single-user or multi-user.

• They can also be categorized as single-tasking or multi-tasking.

• Examples of operating systems include Windows, macOS, Linux, Unix, Android, iOS, and Chrome OS.

The bus speed of RAM refers to the speed at which data is transferred between the RAM and the memory controller.

• Bus speed is measured in MHz and determines the maximum amount of data that can be transferred per second.

• The bus speed of DDR4 RAM ranges from 2133 MHz to 4266 MHz.

• Higher bus speeds result in faster data transfer and better performance.

• The bus speed of RAM should match the bus speed of the motherboard for optimal performance.

I would use remote access tools to troubleshoot the connection issue with the client and guide them through the steps to fix it.

• Initiate a remote session using tools like TeamViewer or AnyDesk to access the client's computer

• Identify the root cause of the connection issue by checking network settings, firewall configurations, or internet connectivity

• Guide the client through troubleshooting steps such as resetting the router, checking cables, or updating drivers

• Provide clear in...read more

Troubleshooting steps for PC network issues

• Check physical connections

• Restart the router/modem

• Check network settings

• Run network troubleshooter

• Check for malware/virus

• Update network drivers

• Reset network settings

DHCP is a protocol that automatically assigns IP addresses to devices on a network. Manual IP requires users to manually configure IP settings.

• DHCP stands for Dynamic Host Configuration Protocol

• DHCP automatically assigns IP addresses to devices on a network

• Manual IP requires users to manually configure IP settings such as IP address, subnet mask, gateway, and DNS servers

• DHCP is commonly used in home and business networks to simplify network configuration

• Manual IP is often use...read more

Oops concept is object-oriented programming principles. Numpy and Pandas are libraries in Python for numerical computing and data manipulation.

• Oops concept involves principles like inheritance, encapsulation, polymorphism, and abstraction.

• Numpy is a library for numerical computing in Python, providing support for large, multi-dimensional arrays and matrices.

• Pandas is a library for data manipulation and analysis in Python, offering data structures like DataFrame for handling s...read more

Foreign key is a column in a table that refers to the primary key of another table, while reference key is not a database term.

• Foreign key is used to establish a relationship between two tables in a database.

• Reference key is not a database term, but it can refer to a key used in programming to refer to an object or method.

• Foreign key ensures data integrity and consistency in the database.

• Reference key is used in programming to create associations between objects or methods.

• Ex...read more

Auto scaler in AWS automatically adjusts the number of EC2 instances in a group based on traffic or performance metrics.

• Auto scaler helps in maintaining optimal performance and cost efficiency by scaling EC2 instances up or down as needed.

• Horizontal scaling adds more instances to the existing pool, while vertical scaling increases the size of existing instances.

• Horizontal scaling is generally more preferable as it provides better fault tolerance and scalability compared to ve...read more

FAT32 is an older file system with limitations on file size and NTFS is a newer file system with advanced security features.

• FAT32 has a maximum file size of 4GB while NTFS can handle much larger files.

• NTFS supports file compression, encryption, and permissions while FAT32 does not.

• FAT32 is compatible with more devices and operating systems than NTFS.

• NTFS has a journaling feature that helps recover data in case of a system crash.

• FAT32 is commonly used for USB drives and older ...read more

Windows backup can be taken using built-in tools like File History or Backup and Restore.

• Open Control Panel and select Backup and Restore

• Click on Set up backup and follow the prompts

• Choose the files and folders you want to backup

• Alternatively, use File History to backup specific folders

• You can also use third-party backup software like Acronis True Image

To configure an email ID in Exchange, follow these steps:

• Open Exchange Admin Center

• Click on recipients and then on mailboxes

• Click on the plus sign to create a new mailbox

• Select the mailbox type and fill in the required details

• Click on save to create the mailbox

The network id for ip 192.168.0.23 is 192.168.0.0.

• Identify the subnet mask for the network

• Perform a bitwise AND operation between the IP address and subnet mask

• The result is the network id

Troubleshooting steps for a slow PC

• Check for malware and viruses

• Free up disk space

• Uninstall unnecessary programs

• Update drivers and software

• Check for hardware issues

To resolve an excited issue for a user, listen actively, empathize, provide clear instructions, and offer reassurance.

• Listen actively to the user's concerns and frustrations.

• Empathize with the user's emotions and acknowledge their feelings.

• Provide clear instructions on how to resolve the issue step by step.

• Offer reassurance that the problem will be resolved and provide a timeline if possible.

Booting system involves initializing hardware, loading operating system and executing startup scripts.

• Power on the computer to start the boot process

• BIOS/UEFI firmware checks hardware components

• Bootloader loads operating system kernel

• Operating system initializes drivers and services

• Startup scripts run to configure system settings

• Examples: GRUB, Windows Boot Manager

A ticketing tool is a software used to manage and track customer support requests. Encryption is the process of converting data into a code to prevent unauthorized access.

• Ticketing tools help IT engineers manage and prioritize support requests

• Encryption is used to protect sensitive data from unauthorized access

• Common encryption methods include AES, RSA, and SHA

• Encryption is used in various applications such as online banking, email, and messaging services

I would start by checking the application logs, verifying configurations, and testing different scenarios.

• Check application logs for any errors or warnings

• Verify configurations to ensure they are correct

• Test different scenarios to replicate the issue

• Use monitoring tools to track performance metrics

• Collaborate with team members to troubleshoot and find solutions

Considerations for configuring IPsec VPN

• Security requirements of the network

• Bandwidth requirements

• Compatibility with existing network infrastructure

• Authentication and encryption protocols

• Key management

• Firewall and NAT traversal

• Client compatibility

• Scalability

• Redundancy and failover

• Logging and monitoring

• Regulatory compliance

I have X years of experience in the IT engineering field.

• I have worked on various projects involving network infrastructure design and implementation.

• I am proficient in programming languages such as Java and Python.

• I have experience in troubleshooting and resolving technical issues.

• I have worked with different operating systems such as Windows, Linux, and macOS.

• I have experience in cloud computing and virtualization technologies.

• I have worked with different databases such as ...read more

I handled an average of 20-25 calls tickets per day and took around 30-45 minutes to solve each ticket.

• Handled 20-25 calls tickets per day

• Took 30-45 minutes to solve each ticket

• Prioritized urgent tickets first

• Collaborated with team members to solve complex tickets

Ping command is used to test the connectivity between two devices on a network.

• Ping command sends an ICMP echo request to the target device and waits for a response.

• It measures the round-trip time for the packet to travel from the source device to the target device and back.

• It can also be used to determine the IP address of a device on a network.

• Ping command is useful for troubleshooting network connectivity issues.

• It can also be used to check the status of a website or serve...read more

LAN and WAN are types of computer networks. RJ45 cable is important for connecting devices in a network.

• LAN stands for Local Area Network and is used to connect devices within a small geographical area like an office or a building.

• WAN stands for Wide Area Network and is used to connect devices over a large geographical area like cities or countries.

• RJ45 cable is used to connect devices in a network and is important for transmitting data between them.

• RJ45 cable is also known a...read more

Data can be maintained using various software such as MS Office, Tally, ERP, and CRM.

• Identify the type of data to be maintained

• Choose the appropriate software for the specific data

• Ensure regular backups are taken to prevent data loss

• Implement security measures to protect sensitive data

• Train employees on how to use the software effectively

Active Directory is a Microsoft service that manages network resources and allows for centralized authentication and authorization.

• Active Directory is used to manage users, computers, and other network resources

• It allows for centralized authentication and authorization

• It uses a hierarchical structure of domains and organizational units (OUs)

• Group Policy Objects (GPOs) can be used to enforce policies and settings across the network

• Active Directory can integrate with other Micr...read more

The subnet mask for IP 192.168.45.21 is typically 255.255.255.0.

• Subnet masks determine the network and host portions of an IP address.

• The default subnet mask for a Class C network is 255.255.255.0.

• Subnet masks are represented in dotted decimal notation.

Print even numbers in Python and Fibonacci series in Python.

• For printing even numbers in Python, use a loop to iterate through a range of numbers and check if each number is divisible by 2.

• For printing Fibonacci series in Python, use a loop to generate the series by adding the previous two numbers in the sequence.

• Example for even numbers in Python: for i in range(1, 11): if i % 2 == 0: print(i)

• Example for Fibonacci series in Python: a, b = 0, 1 for _ in range(10): print(a) a,...read more

IP address can be found using command prompt or network settings.

• Use 'ipconfig' command in command prompt to find IP address

• Go to network settings and look for 'IPv4 Address' or 'IP Address'

• Use online IP lookup tools to find IP address of a website

Troubleshooting a system involves identifying and resolving issues that prevent it from functioning properly.

• Start by gathering information about the problem and its symptoms

• Use diagnostic tools to identify the root cause of the issue

• Develop and implement a plan to resolve the problem

• Test the system to ensure the issue has been resolved

• Document the troubleshooting process and solution for future reference

The colour coding for straight cable follows a specific pattern to ensure proper connections.

• The colour coding for straight cable typically follows the T568A or T568B standard

• In T568A, the colour coding is: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown

• In T568B, the colour coding is: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown

Commands used in Dockerfile are instructions that define how an image should be built.

• FROM: specifies the base image

• RUN: executes commands in a new layer on top of the current image

• COPY: copies files from the host machine to the image

• CMD: specifies the default command to run when a container is started

• EXPOSE: exposes ports from the container to the host machine

• WORKDIR: sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD instructions

• ENV: sets environment var...read more