Networking Devices
1. NIC (Network Interface Card)
NIC connects a computer to the network. It converts computer data into network signals and provides a unique MAC address.
2. Hub
A Hub connects multiple computers in a network and sends incoming data to all connected devices.
3. Switch
A Switch connects computers in a LAN and forwards data only to the intended device using the MAC address.
4. Bridge
A Bridge connects two LAN segments and forwards data only when required, reducing network traffic.
5. Router
A Router connects different networks and forwards data packets using IP addresses.
6. Modem
A Modem converts digital signals into analog signals and vice versa to connect the network to the Internet.
7. Gateway
A Gateway connects different networks using different communication protocols and acts as a translator.
Stages of Establishing a Network Connection
Stage 1 – Computer → NIC
The computer sends data to the Network Interface Card (NIC). The NIC converts the data into network signals and assigns a unique MAC address.
Stage 2 – NIC → Switch
The Switch receives the frame, checks the destination MAC address, and forwards it only to the correct device within the Local Area Network (LAN).
Stage 3 – Switch → Bridge
If the destination device is located in another LAN segment, the Bridge forwards the frame to that segment while reducing unnecessary network traffic.
Stage 4 – Bridge → Router
The Router reads the destination IP address and determines the best route to send the packet to another network.
Stage 5 – Router → Modem
The Modem converts digital signals into analog signals (or vice versa) and transmits them to the Internet Service Provider (ISP).
Stage 6 – ISP → Gateway
When communication occurs between networks using different protocols, the Gateway translates the data into the required format before forwarding it.
Stage 7 – Gateway → Internet → Destination Server
The packet travels through the Internet to the destination server. The server processes the request and returns the response through the same path.
Overall Flow of Network Communication
⬇
NIC
⬇
Switch
⬇
Bridge (If Required)
⬇
Router
⬇
Modem
⬇
Internet Service Provider (ISP)
⬇
Gateway (If Required)
⬇
Internet
⬇
Destination Server
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