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Network Devices and Functions, Data Transmission: Delivers data directly…
Network Devices and Functions
Switch
Efficiency: High – Reduces unnecessary traffic, improves network performance and security.
Function: Connects devices in a local area network (LAN) intelligently.
Characteristics:
Sends data only to the specific device based on its MAC address.
Operates at the Data Link Layer (Layer 2) of the OSI model.
Maintains a MAC address table to map devices to ports.
Router
Example: A home router connects laptops, phones, and smart devices to the internet via Wi-Fi.
Characteristics
Uses IP addresses to determine the best route for data.
Can include additional features like a firewall or Wi-Fi access point.
Can include additional features like a firewall or Wi-Fi access point.
Function: Routes data between different networks (e.g., LAN and WAN).
Data Transmission: Reads IP headers to forward packets to their destination.
Efficiency: High – Ensures optimal data flow and security between networks.
Modem
Data Transmission: Translates data from the ISP for devices in the local network.
Function: Converts digital signals to analog and vice versa, connecting local networks to the internet via an ISP.
Efficiency: Medium – Facilitates internet connectivity but doesn’t manage internal traffic.
Example: A home modem connects to ISPs like Comcast, FPT, or Viettel to provide internet access.
Characteristics:
Acts as a bridge between the ISP and the local network.
Supports DSL, cable, or fiber connections depending on the ISP.
Usually connects to a router for internal network management.
Hub
Characteristics
Does not differentiate between devices; all data is broadcasted to every port.
Operates at the Physical Layer (Layer 1) of the OSI model.
Simple and inexpensive, but less efficient and secure.
Example: Used in small or simple networks like a home office setup.
Data Transmission: Sends data to all connected devices regardless of the destination.
Data Transmission: Delivers data directly to the destination device using MAC addresses.
Example: Connecting computers, printers, and servers in an office network.
Function: Connects devices in a local area network but broadcasts data to all devices.
Efficiency: Low – Causes network congestion and increases the risk of eavesdropping.