Computer Networks interview questions

Master Computer Networks interview questions with 30+ curated problems, answer outlines, and placement-focused preparation.

Preview Questions

  1. What is a Computer Network?

    A computer network is a system of interconnected computers and devices that can communicate with each other to share data, resources, and information. Networks enable multiple devices to exchange information efficiently...

  2. Explain the OSI Model and its seven layers.

    The OSI (Open Systems Interconnection) model is a conceptual framework defining how network communication functions through seven distinct layers. Each layer provides services to the layer above it and relies on...

  3. What is the difference between LAN, MAN, and WAN?

    A Local Area Network (LAN) connects devices within a limited geographical area like a home, office building, or small campus. LANs are typically fast with low latency and are often privately owned and managed by...

  4. What is TCP/IP and its importance in networking?

    TCP/IP (Transmission Control Protocol/Internet Protocol) is the fundamental suite of protocols enabling communication across the Internet and modern computer networks. TCP/IP consists of multiple protocols working...

  5. What is an IP Address and its types?

    An IP address is a unique numerical identifier assigned to each device connected to a network, serving two main purposes: identifying the device or host and providing its location in the network. IP addresses enable...

  6. What is the TCP three-way handshake?

    The TCP three-way handshake is the process by which two devices establish a TCP connection before exchanging data. This handshake ensures both parties are ready to communicate and synchronizes sequence numbers for...

  7. What is UDP and how does it differ from TCP?

    UDP (User Datagram Protocol) is a transport layer protocol providing fast, connectionless communication without guaranteeing delivery or ordering of packets. Unlike TCP which establishes connections and ensures reliable...

  8. What is a Subnet and Subnet Mask?

    A subnet is a subdivision of an IP network created by dividing a larger network into smaller logical segments using subnet masks. Subnetting enables efficient IP address allocation and network management by breaking...