A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. Firewalls protect networks from unauthorized access while permitting legitimate communication to pass. They ac…A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. Firewalls protect networks from unauthorized access while permitting legitimate communication to pass. They act as a barrier between trusted and untrusted environments, typically between an organization's internal network and the internet. Firewalls can be hardware or software-based and can use threat intelligence, intrusion detection systems, and intrusion prevention systems to effectively secure a network. They can also help to segment a network, preventing unauthorized access to critical systems.
CompTIA Security Plus: Network Security/Firewall
Why is a Firewall Important? A firewall is critical for network security because it acts as a barrier between internal networks and external networks, like the internet. It allows or blocks traffic based on an established set of security rules. Without a firewall, your network would be open to a wide variety of cyber threats.
What is a Firewall? A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It establishes a barrier between your internal network (trusted) and external network (untrusted like the internet).
How does a Firewall Work? It operates by inspecting data packets in network traffic flows and determining whether to allow them through or not, based on rules pre-configured by a network administrator. Firewalls can be hardware, software, or a combination of both.
Exam Tips: Answering Questions on Firewall 1. Understand the Basics: Make sure to understand basic firewall concepts and how it functions. 2. Terminologies: Be familiar with key firewall terminologies such as 'packet filtering', 'stateful inspection' and 'proxy servers'. 3. Firewall Types: Be able to differentiate between different types of firewalls like packet-filtering firewalls, stateful multilayer inspection firewalls, and proxy firewalls. 4. Practical Applications: Understand the practical applications of a firewall and how firewall rules are created and applied. 5. Security Policies: Get around the concepts related to firewall policies and the security provided by a firewall.
A company you manage has noticed frequent failed authorization attempts in the firewall logs. Which option should be enabled to defend against these brute force login attempts?
Question 2
Your network administrator has just enabled a new web server on a DMZ. It is not accessible from the internet, but internal users can access it. What must be configured on your company's firewall to grant internet users access to the web server without compromising security?
Question 3
Your company has recently experienced multiple unauthorized access attempts to the company's internal network from the internet. As the network administrator, which firewall policy should you implement?
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