Computer Network Components

Computer network components are the major parts required to install and run a network. Some essential components include NIC, switch, cable, hub, router, and modem. Depending on the type of network (wired or wireless), some components may or may not be necessary. For example, a wireless network does not require cables.

1. NIC (Network Interface Card)

• NIC is a hardware component used to connect a computer to a network.
• It supports transfer rates of 10, 100, or 1000 Mb/s.
• The MAC address or physical address is encoded on the chip and uniquely identifies the NIC.
• The MAC address is stored in PROM (Programmable Read-Only Memory).

Types of NIC:

• Wired NIC: Integrated into the motherboard and uses cables and connectors for data transmission.
• Wireless NIC: Uses antennas to connect over wireless networks. Commonly found in laptops.

2. Hub

• A Hub is a hardware device that splits the network connection among multiple devices.
• When a request is made by a computer, the hub broadcasts it to the entire network.
• All devices check if the request is meant for them; if not, they ignore it.
• Hubs consume more bandwidth and limit communication efficiency.
• Modern networks typically replace hubs with switches or routers.

3. Switch

• A Switch connects multiple devices in a network and is more intelligent than a hub.
• It maintains a table to identify where data should be sent.
• It forwards messages only to the intended recipient, improving network speed.
• Switches provide a direct path between source and destination, increasing overall performance.

4. Router

• A Router connects a local network (LAN) to the internet.
• Operates at Layer 3 (Network Layer) of the OSI model.
• Analyzes incoming packets and forwards them based on the routing table.
• Determines the best path for data transmission.

Advantages of Router:

• Security: Only the addressed device receives and reads the data.
• Reliability: Network outages in one area do not affect others served by different routers.
• Performance: Divides traffic efficiently across smaller segments, reducing congestion.

5. Modem

• A Modem allows computers to connect to the internet via telephone lines.
• Installed in the PCI slot on the motherboard.
• Modem = Modulator/Demodulator: Converts digital data to analog for transmission and vice versa.

Types of Modems:

• Standard PC Modem (Dial-up)
• Cellular Modem
• Cable Modem

6. Cables and Connectors

Cables are used as transmission media for data transfer.

Types of Cables:

• Twisted Pair Cable
• Coaxial Cable
• Fibre-Optic Cable