Computer Network Viva Questions and Answers

Preparing for a computer network viva can feel challenging, especially if you’re unsure what questions the examiner might ask. Whether you’re a student, job seeker, or preparing for a networking lab exam, knowing the most common computer network viva questions can boost your confidence and help you perform better.

In this guide, you will find important computer network Viva questions and answers, ranging from basic networking concepts to advanced topics such as the OSI model, TCP/IP, IP addressing, network devices, and network security.

Basic Computer Network Viva Questions and Answers 

Here are some basic questions

What Is a Computer Network?

A computer network is a group of two or more computers and devices connected to share data, resources, and services. Networks allow users to communicate, transfer files, and access shared resources efficiently. The Internet is the largest computer network in the world.

What Are the Main Components of a Computer Network?

A computer network consists of several hardware and software components that work together to enable communication between devices.

Main network components include:

• Computers and servers
• Routers
• Switches
• Network cables
• Network Interface Cards (NICs)
• Wireless access points

What Is a Node in a Computer Network?

A node is any device connected to a network that can send, receive, or process data. Examples of nodes include computers, printers, routers, and servers. Every device that participates in network communication is considered a node.

What Is Networking?

Networking is the process of connecting multiple devices so they can exchange information and share resources. It helps users communicate, access the internet, and collaborate efficiently within a network environment.

What Is a Protocol?

A protocol is a set of rules that governs how data is transmitted and received over a network. Protocols ensure that devices can communicate accurately and understand each other during data exchange.

Why Are Protocols Important?

Protocols are important because they standardize communication between devices. Without protocols, computers and networking equipment would not be able to exchange data reliably.

What Is Data Communication?

Data communication is the process of transmitting information from one device to another through a communication medium. It can occur through wired or wireless connections and is essential for networking.

What Is Network Topology?

Network topology refers to the physical or logical arrangement of devices in a network. It determines how devices are connected and how data flows between them.

What Are the Common Types of Network Topology?

Several topologies are used in computer networks, each with its own advantages and disadvantages.

Common network topologies include:

• Star Topology
• Bus Topology
• Ring Topology
• Mesh Topology
• Tree Topology

Which Network Topology Is Most Commonly Used?

Star topology is the most commonly used network topology today. In this setup, all devices connect to a central switch or hub, making the network easier to manage and troubleshoot.

What Is LAN?

LAN (Local Area Network) is a network that connects devices within a small area, such as a home, school, or office. It allows users to share files, printers, and internet connections quickly and efficiently.

What Is MAN?

MAN (Metropolitan Area Network) is a network that covers a larger area than a LAN, such as a city or large campus. It connects multiple LANs to enable communication across different locations.

What Is WAN?

WAN (Wide Area Network) connects devices across large geographical areas, including different cities, countries, or continents. The internet is the most common example of a WAN.

What Is PAN?

PAN (Personal Area Network) is a small network created around an individual. It is commonly used to connect devices such as smartphones, smartwatches, wireless earphones, and laptops.

What Is WLAN?

WLAN (Wireless Local Area Network) is a type of LAN that uses Wi-Fi instead of cables. It allows users to connect devices to a network wirelessly within a limited area.

What Is a Router?

A router is a networking device that connects different networks and forwards data packets to their destination. It helps devices communicate with each other and access the internet.

What Is a Switch?

A switch is a networking device that connects multiple devices within a network. It sends data only to the intended device, improving network efficiency and performance.

What Is a Hub?

A hub is a basic networking device that connects multiple devices in a network. Unlike a switch, it broadcasts data to all connected devices, which can reduce network efficiency.

What Is a Modem?

A modem is a device that connects a computer or network to an internet service provider (ISP). It converts digital signals into analog signals and vice versa for internet communication.

What Is an Access Point?

An access point is a device that provides wireless connectivity to devices within a network. It helps extend Wi-Fi coverage and allows more devices to connect wirelessly.

What Is an IP Address?

An IP address is a unique numerical identifier assigned to each device connected to a network. It helps devices locate and communicate with one another over the internet or a local network.

What Is DNS?

DNS (Domain Name System) acts like the Internet’s phonebook. It converts domain names, such as google.com, into IP addresses so computers can easily locate websites.

What Is the OSI Model?

The OSI (Open Systems Interconnection) Model is a conceptual framework for understanding how data travels across a network. It divides network communication into seven layers, each performing a specific function.

How Many Layers Are in the OSI Model?

The OSI Model consists of seven layers that work together to ensure smooth communication between devices. Each layer handles a different part of the data transmission process.

The seven layers are:

• Physical Layer
• Data Link Layer
• Network Layer
• Transport Layer
• Session Layer
• Presentation Layer
• Application Layer

What Is the Physical Layer?

The Physical Layer is the first layer of the OSI Model. It is responsible for transmitting raw data bits through physical media such as cables, switches, and network hardware.

What Is the Data Link Layer?

The Data Link Layer ensures reliable communication between devices on the same network. It detects and corrects errors that may occur during data transmission.

What Is the Network Layer?

The Network Layer is responsible for routing data packets from the source to the destination. It uses IP addresses to identify devices and determine the best path for data transfer.

What Is the Transport Layer?

The Transport Layer ensures that data is delivered correctly and completely. It manages error checking, flow control, and reliable communication between devices.

What Is the Session Layer?

The Session Layer establishes, manages, and terminates communication sessions between devices. It helps maintain a stable connection during data exchange.

What Is the Presentation Layer?

The Presentation Layer translates data into a format that applications can understand. It also handles encryption, decryption, and data compression.

What Is the Application Layer?

The Application Layer is the top layer of the OSI Model. It provides network services directly to users and applications, such as web browsers and email programs.

What Is the TCP/IP Model?

The TCP/IP Model is the networking model used on the internet. It defines how data is transmitted between devices and forms the foundation of modern network communication.

How Many Layers Are in the TCP/IP Model?

The TCP/IP Model has four layers, which are simpler than the OSI Model’s seven layers.

TCP/IP layers include:

• Application Layer
• Transport Layer
• Internet Layer
• Network Access Layer

What Is TCP?

TCP (Transmission Control Protocol) is a reliable communication protocol that ensures data is delivered accurately and in the correct order. It is widely used for web browsing, email, and file transfers.

What Is UDP?

UDP (User Datagram Protocol) is a faster communication protocol that does not guarantee delivery. It is commonly used for online gaming, video streaming, and voice calls.

What Is the Difference Between TCP and UDP?

Both TCP and UDP are transport-layer protocols, but they work differently.

TCP:

• Reliable communication
• Error checking
• Slower speed

UDP:

• Faster communication
• No delivery guarantee
• Lower overhead

What Is HTTP?

HTTP (HyperText Transfer Protocol) is the protocol used to transfer web pages between web servers and browsers. It allows users to access websites on the internet.

What Is HTTPS?

HTTPS (HyperText Transfer Protocol Secure) is the secure version of HTTP. It encrypts data to protect sensitive information from hackers and cyber threats.

What Is FTP?

FTP (File Transfer Protocol) is used to transfer files between computers over a network. It is commonly used for website management and file sharing.

What Is SMTP?

SMTP (Simple Mail Transfer Protocol) is used to send emails between mail servers. It plays a key role in email communication.

What Is POP3?

POP3 (Post Office Protocol Version 3) is an email protocol used to download emails from a mail server to a local device.

What Is IMAP?

IMAP (Internet Message Access Protocol) allows users to access and manage emails directly on the mail server. It keeps messages synchronized across multiple devices.

Network Security Viva Questions

These are the network security Viva questions

What Is Network Security?

Network security is the practice of protecting a computer network from unauthorized access, attacks, and data theft. It uses various tools, policies, and technologies to protect data and devices.

Why Is Network Security Important?

Network security helps protect sensitive information from cybercriminals. It also ensures data confidentiality, integrity, and availability while reducing the risk of cyberattacks.

What Is a Firewall?

A firewall is a security system that monitors and controls incoming and outgoing network traffic. It acts as a barrier between a trusted network and potential threats from the internet.

What Is Encryption?

Encryption is the process of converting readable data into an unreadable format. Only authorized users with the correct key can decrypt and access the original information.

What Is a VPN?

A VPN (Virtual Private Network) creates a secure and encrypted connection over the internet. It helps protect user privacy and allows secure access to network resources.

What Is Malware?

Malware is malicious software designed to damage, disrupt, or gain unauthorized access to a computer system. Common types include viruses, worms, ransomware, and spyware.

What Is Phishing?

Phishing is a cyberattack that tricks users into revealing sensitive information such as passwords, bank details, or personal data through fake emails or websites.

What Is Authentication?

Authentication is the process of verifying the identity of a user, device, or application before granting access to a network or system.

What Is Authorization?

Authorization determines what resources and actions an authenticated user is allowed to access within a network or system.

What Is Antivirus Software?

Antivirus software is a security program that detects, prevents, and removes malicious software from a computer or network.

Advanced Computer Network Viva Questions

Here are some advanced computer network questions for the viva 2026

What Is NAT?

NAT (Network Address Translation) allows multiple devices on a private network to share a single public IP address. It helps conserve IP addresses and improves security.

What Is VLAN?

A VLAN (Virtual Local Area Network) is a logical grouping of devices within a network. It improves network management, performance, and security by separating traffic.

What Is QoS?

QoS (Quality of Service) is a technique used to prioritize important network traffic. It ensures that applications like video conferencing and VoIP receive sufficient bandwidth.

What Is a Proxy Server?

A proxy server acts as an intermediary between a user and the Internet. It can improve security, privacy, and network performance.

What Is Port Forwarding?

Port forwarding redirects network traffic from one address and port number to another. It is commonly used for remote access and online gaming.

What Is Cloud Networking?

Cloud networking uses cloud-based infrastructure and services to manage network resources. It provides scalability, flexibility, and remote accessibility.

What Is SDN?

SDN (Software-Defined Networking) is a networking approach that separates the control plane from the hardware. It allows administrators to manage networks more efficiently through software.

What Is Network Congestion?

Network congestion occurs when the amount of data traffic exceeds the network’s capacity. This can result in slower speeds and reduced performance.

What Is Network Troubleshooting?

Network troubleshooting is the process of identifying and resolving network problems. It helps maintain stable connectivity and efficient communication.

What Is Bandwidth?

Bandwidth is the maximum amount of data that can be transmitted over a network in a given period. Higher bandwidth generally results in faster data transfer.

Tips to Prepare for a Computer Network Viva

A good understanding of networking concepts can help you answer viva questions confidently. Focus on learning both theoretical and practical aspects of networking.

Useful preparation tips:

• Understand networking fundamentals.
• Learn the OSI and TCP/IP models thoroughly.
• Memorize important networking protocols.
• Practice common viva questions regularly.
• Revise IP addressing concepts.
• Understand the functions of networking devices.
• Give short, clear, and confident answers.
• Relate concepts to real-world networking examples.

Conclusion

Computer network viva questions are an excellent way to test and improve your understanding of networking concepts. Topics such as network types, devices, protocols, IP addressing, the OSI model, TCP/IP, and network security are commonly asked in exams, interviews, and lab vivas.

By regularly practicing these questions and understanding the concepts behind them, students can build confidence and perform better during their viva examinations. A strong foundation in computer networking not only supports academic performance but also prepares you for future careers in IT, cybersecurity, cloud computing, and network administration.

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