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Technical Support Interview Questions and 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.

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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.

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Ques 3. What is DNS and how does it work?

Domain Name System (DNS) translates human-readable domain names into IP addresses. It works through a distributed hierarchy of DNS servers that store and manage domain name information.

Example:

When you enter a website's domain name (e.g., www.example.com), DNS resolves it to the corresponding IP address (e.g., 192.168.1.1).

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Ques 4. 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.

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Ques 5. 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.

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