Functions of Network Devices
- Network devices are the building blocks of digital communication, each playing a specific role in ensuring data is transmitted efficiently and securely.
- Understanding these devices is essential for grasping how networks function and how they map to the layers of the TCP/IP model.
This section focuses on the functions of key network devices and their mapping to the TCP/IP model.
Gateways
Gateways
Gateways are network devices that act as bridges between two networks using different protocols. They translate data formats and ensure seamless communication between disparate systems.
Gateways operate primarily at the Application Layer of the TCP/IP model but can function across multiple layers depending on their specific role.
Hardware Firewalls
Firewalls
Firewalls are security devices that monitor and control network traffic based on predetermined rules. They act as a barrier between trusted and untrusted networks.
- Software and Hardware Firewalls are the same.
- Software Firewalls are just installed as an application on an individual device (on your computer).
- It would monitor device level traffic.
- They are customisable to protect individual devices not an entire network.
Firewalls primarily operate at the Internet Layer but can inspect data at the Transport and Application Layers in advanced configurations.
Modems
Modems
Modems (Modulator-Demodulators) convert digital data from a computer into analog signals for transmission over telephone lines or broadband connections.
Modems operate at the Link Layer of the TCP/IP model, handling the conversion of data for physical transmission.
Network Interface Cards (NICs)
NICs
NICs are hardware components that enable a device to connect to a network. They convert electrical signals into digital data and vice versa.
NICs operate at the Link Layer, providing the physical interface between a device and the network.
