Devices Operating at Different Layers of the OSI Model

Integrated Switch

A switch that is combined with other devices, such as wireless routers or modems, to provide additional functionality.

Transport Layer

The fourth layer of the OSI model where a firewall filters traffic based on port numbers and protocols, ensuring reliable data delivery.

Cost

The price of a firewall, which varies depending on its features, capabilities, and performance.

Data Link Layer

The second layer of the OSI model where a switch operates, responsible for reliable data transfer between adjacent network nodes.

Network Layer

The third layer of the OSI model where a router operates, responsible for logical addressing, routing, and forwarding of data packets.

Application Layer

The top layer of the OSI model where a firewall can operate, responsible for providing network services to applications and users.

Malware

Malicious software that a firewall can help prevent, including viruses, worms, trojans, and ransomware.

Switch

A data link layer device that connects multiple devices within a local area network (LAN) and directs traffic between them.

Firewall

A device that operates at multiple layers of the OSI model to filter and control network traffic, protecting against unauthorized access and malicious attacks.

Layer 4 Firewall

A firewall that operates at the network and transport layers, filtering traffic based on IP addresses, ports, and protocols.

Layer 7 Firewall

A firewall that operates at the session, presentation, and application layers, providing advanced filtering and content analysis capabilities.

Software Firewall

A firewall that runs as software on a virtual machine or physical server, providing network security within the host system.

Session Layer

A layer of the OSI model where a firewall can operate, responsible for establishing, managing, and terminating sessions between applications.

SQL Injection

A malicious attack that a firewall can help prevent, where an attacker inserts malicious SQL code into a query to manipulate or access a database.

Router

A network layer device that connects different networks together, enabling communication between them.

Hardware Firewall

A physical device, such as Fortinet's Fortigate, that functions as a dedicated firewall, providing network security for an entire network.

Standalone Switch

A switch that can be used independently without integration with other devices.