Computer Systems and Networking for Beginners: A Comprehensive Beginner's Guide to understanding Computer Systems, Networking Essentials, and the Foundations of Digital Connectivity. 2 books in 1 by Carrie Saimon

Author:Carrie, Saimon
Language: eng
Format: epub
Published: 2024-06-22T00:00:00+00:00

Firewalls:

Firewalls act as a barrier between a trusted internal network and untrusted external networks, such as the internet. They monitor and control incoming and outgoing network traffic based on predetermined security rules or policies. Firewalls can be implemented as hardware appliances, software applications, or a combination of both. Here are some key functions and benefits of firewalls:

Packet Filtering: Firewalls inspect packets of data as they pass through the network and block or allow them based on predefined rules. This helps prevent unauthorized access and filter out potentially malicious traffic.

Stateful Inspection: Stateful firewalls maintain information about the state of active connections, allowing them to make more informed decisions about whether to permit or block traffic. This helps prevent certain types of attacks, such as session hijacking.

Application Layer Filtering: Some firewalls can inspect traffic at the application layer (Layer 7 of the OSI model), allowing them to identify and block specific applications or protocols that pose security risks.

Network Segmentation: Firewalls can be used to divide a network into separate security zones, each with its own set of rules and access controls. This helps contain security breaches and limit the spread of malware or unauthorized access.

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