Computer Network

Interview Questions

A computer network is a set of interconnected computers that communicate with each other for sharing resources and information.
The OSI model has seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. It provides a framework for understanding network functionalities.
TCP (Transmission Control Protocol) is connection-oriented and ensures reliable data delivery. UDP (User Datagram Protocol) is connectionless and faster but doesn\'t guarantee delivery.
An IP address uniquely identifies a device on a network, enabling data routing and communication between devices.
Subnetting is the process of dividing an IP network into sub-networks to improve performance and security.
A router connects different networks and directs data between them. It operates at the network layer (Layer 3) of the OSI model.
DNS (Domain Name System) translates domain names into IP addresses, facilitating easy identification of resources on a network.
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on a network, simplifying the configuration process.
A hub operates at the physical layer, a switch at the data link layer, and a router at the network layer. Hubs broadcast data to all connected devices, switches forward data based on MAC addresses, and routers connect different networks.
ARP resolves IP addresses to MAC addresses, allowing devices on the same network to communicate.

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