A computer network connects devices so they can exchange data, share services, and reach applications. Modern networks combine wired Ethernet, Wi-Fi, IP addressing, switching, routing, and security controls to support users at home, in offices, and across the internet.
Common Types of Computer Networks
- PAN: a personal area network for nearby devices, often using Bluetooth or USB.
- LAN: a local area network for a home, office, floor, or building.
- WLAN: a wireless LAN using Wi-Fi access points.
- CAN: a campus network that joins multiple LANs across a university or business site.
- MAN: a metropolitan network spanning a city or region.
- WAN: a wide area network connecting distant sites through carrier, internet, or cloud services.
Network Components
Endpoints such as computers, phones, servers, printers, and IoT devices connect through network interface cards. Switches provide local connectivity, routers move traffic between IP networks, wireless access points deliver Wi-Fi, and firewalls enforce security policies.
Network Topologies
Topology describes how devices are connected logically and physically. A star topology, where devices connect to a central switch, is the most common design for Ethernet LANs. Mesh and redundant designs are common where high availability is required.
Client-Server and Peer-to-Peer Networks
In a client-server network, centralized services such as identity, files, applications, and databases are hosted on servers. Peer-to-peer networks allow devices to share resources directly and are best suited to small, simple environments.
How Networks Communicate
Most modern networks use the TCP/IP suite. Ethernet and Wi-Fi deliver local frames, IP provides addressing and routing, TCP or UDP transports application data, and services such as DNS translate names into IP addresses.
Network Design Basics
- Use separate VLANs or subnets for users, servers, voice, guest Wi-Fi, and management traffic.
- Plan IP addressing before deployment and document gateways, DNS, and DHCP scopes.
- Use strong Wi-Fi security, firewall rules, updates, and backups.
- Monitor bandwidth, errors, latency, and device health.
Continue Learning
Build your foundation with our IP Addressing guide, VLAN Configuration guide, and WAN Technologies guide. For Cisco-focused study resources, see the Cisco Premium PDF collection.