Technical Support Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is the purpose of DHCP?
Dynamic Host Configuration Protocol (DHCP) is used to automatically assign IP addresses and other network configuration information to devices on a network.
Example:
For example, when a computer connects to a network, DHCP ensures it receives a valid IP address, subnet mask, and default gateway without manual configuration.
Ques 2. Explain the difference between TCP and UDP.
TCP (Transmission Control Protocol) is connection-oriented and ensures reliable data delivery through features like acknowledgment and retransmission. UDP (User Datagram Protocol) is connectionless and provides faster, but less reliable, communication.
Example:
TCP is commonly used for applications like web browsing, while UDP is suitable for real-time applications like online gaming or video streaming.
Ques 3. How does NAT (Network Address Translation) work?
NAT is used to map private IP addresses within a local network to a single public IP address. It enables multiple devices in a local network to share a common public IP address for internet communication.
Example:
When a device with a private IP address sends a request to the internet, the NAT router replaces its private IP with the public IP for external communication.
Ques 4. Explain the concept of firewalls in network security.
A firewall is a security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a secure internal network and untrusted external networks.
Example:
Firewalls can block unauthorized access attempts, filter traffic based on protocols, and prevent certain types of cyber attacks.
Ques 5. What is the purpose of RAID in data storage?
RAID (Redundant Array of Independent Disks) is a data storage technology that combines multiple physical disk drives into a single logical unit for the purpose of data redundancy, performance improvement, or both.
Example:
For example, RAID 1 mirrors data across two drives, providing redundancy in case of a disk failure.
Ques 6. Explain the concept of a 404 error in web browsing.
A 404 error occurs when a web server cannot find the requested page. It is an HTTP status code indicating that the client's request was valid, but the server could not locate the requested content.
Example:
If a user tries to access a non-existent page on a website, the server may respond with a 404 error, indicating that the requested resource was not found.
Ques 7. What is the purpose of the ping command?
The ping command is used to test the reachability of a host on an Internet Protocol (IP) network. It sends ICMP (Internet Control Message Protocol) echo requests to the target host and measures the round-trip time for the responses.
Example:
Running 'ping www.google.com' can help determine if your computer can communicate with the Google server and measure the network latency.
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