A computer network is a digital telecommunications network that allows nodes to share resources.
Common Devices in a Network
- Client – A device that accesses a service made available by a server.
- Server – A device that provides functions or services for clients.
- Switch – Aggregates connections and provides connectivity within the same LAN. It forwards traffic within a LAN, typically has 24 or more ports, and does not provide connectivity between LANs or over the Internet.
- Router – Provides connectivity between LANs and sends data over the Internet. It usually has fewer network interfaces than switches.
- Firewall – Monitors and controls network traffic based on configured rules. It can be placed inside or outside the network.
Types of Firewalls
- Network Hardware Firewall – A hardware device that filters traffic between networks.
- Host-Based Firewall – A software application that filters traffic entering and exiting a host.
Examples of Cisco Devices
- Switches: Cisco Catalyst Switch 9200, 3650
- Routers: ISR 1000, 900, 4000
- Firewalls: ASA 5500-X, Firepower 2100
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Category: CCNA