Learn Firewall

Firewall is one of the most important objectives to secure an enterprise network. Network Help IT Education provides Best Firewall Professional Training with  100% practical .Industrial Training in Firewall which covers various aspects of Firewall Security related with software based firewalls or hardware based firewalls to get the complete knowledge of implementing and managing a firewall in an organization’s network security. The objective of this course in Network Help is to educate the network / security professionals on how to install, configure, verify and manage the different types of firewall software and device. The knowledge will gain through this course can be used to implement secure solutions for enterprise or small to medium sized networks.

Benefits of Firewall

Better career growth – The methods of gaining knowledge such as participating security certification courses or advanced degrees, you have expectations that by achieving these credentials, you will accelerate your career.

Job Opportunity – After getting the knowledge of firewall configuration and management you will get better opportunity in the IT industry as well as in Salary.

Salary Increase and Rewards – Network Engineers and Network Support Engineers, with Firewall knowledge will promote you as a Network Security Administrator or System

What Does a Firewall Do?

The fundamental principle behind firewalls is that network traffic coming from less secure settings needs to be verified and examined before entering a more secure environment. This stops unauthorized people, gadgets, and software programs from accessing a secured network environment or network segment. Your network’s PCs and other devices are vulnerable to hackers without firewalls, making you a prime target for Attacks.
Even if an advanced firewall can no longer defend a network against the diverse range of cyber threats that exist today, these devices are still regarded as the essential building blocks of an effective cybersecurity system. Firewalls provide crucial monitoring and filtering of all traffic, including outgoing traffic, application-layer traffic, online transactions, communications, and connectivity, as part of the first line of protection against cyberattacks.

All traffic, including outgoing traffic, application-layer traffic, online transactions, communications and connectivity—like IPSec or SSL VPN—and dynamic workflows are crucially monitored and filtered by firewalls. Furthermore, proper firewall configuration is crucial because default features can not offer the best defense against attacks.

Network firewalls and host-based firewalls

Network firewalls and host-based firewalls are the two main categories of stateful firewalls.
A host-based firewall, also known as a computer firewall, protects only one computer, or “host,” and is frequently included with the operating system when used on personal or home devices. However, these firewalls can also be applied in business settings to add an additional layer of security. The potential for scalability is constrained since host-based firewalls need to be set up and maintained separately on each device.
A network firewall, as its name suggests, operates at the network level, OSI Layers 3 and 4, scanning any traffic flowing between various network segments or between external sources and your local area network (LAN). They serve as the first line of defense at the edge of the network or network segment, monitoring traffic using deep packet inspection and packet filtering. The firewall rejects and blocks traffic if the content of the packets does not comply with previously chosen criteria based on rules that the network administrator or security team has developed.

Types of Firewalls

Here are some of the different firewall types and their functions:

1. Packet layer: A packet layer analyzes traffic in the transport protocol layer. At the transport protocol layer, applications can communicate with each other using specific protocols: Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). The firewall examines the data packets at this layer, looking for malicious code that can infect your network or device. If a data packet is identified as a potential threat, the firewall gets rid of it.
2. Circuit level: A firewall at the circuit level is positioned as a layer between the transport layer and the application layer of the TCP/Internet Protocol (TCP/IP) stack. Thus, they work at the session layer of the Open Systems Interconnection (OSI) model. In the TCP model, before information can be passed from one cyber entity to another, there needs to be a handshake. A circuit level firewall examines the data that passes during this handshake. The information in the data packets can alert a firewall to potentially harmful data, and the firewall can then discard it before it infects another computer or system.
3. Application layer: An application layer firewall makes sure that only valid data exists at the application level before allowing it to pass through. This is accomplished through a set of application-specific policies that allow or block communications being sent to the application or those the application sends out.
4. Proxy server: A proxy server captures and examines all information going into or coming out of a network. A proxy server acts like a separate computer between your device and the internet. It has its own IP address that your computer connects to. As information comes in or goes out of the proxy server, it is filtered, and harmful data is caught and discarded.
5. Software firewalls: The most common kind of software firewall can be found on most personal computers. It works by inspecting data packets that flow to and from your device. The information in the data packets is compared against a list of threat signatures. If a data packet matches the profile of a known threat, it is discarded.

Limitations of a Firewall

Firewalls can stop a wide range of threats, but they also have the following limitations:

1. They can’t stop users from accessing information on malicious websites after the user has already connected to the website.
2. They don’t protect organizations from social engineering.
3. If your system has already been infected, the firewall cannot find the threat unless it tries to spread by crossing through the firewall.
4. A firewall cannot prevent hackers from using stolen passwords to access sensitive areas of your network.

Firewall Modules

Introduction to Information Security: –

• The key terms and critical concepts of information and network security
• Identify and differentiate the threats posed to information and network security, as well as the common attacks associated with those threats

Security Policies and Standard: –

• Three types of information security policy
• Critical Components of each security policy
• Elements of key information security management practices

Authenticating Users: –

• Firewall Authentication
• Advantages and Disadvantages

Introduction to Firewall: –

• Misconceptions about firewalls
• Types of Protection

Packet Filtering: –

• Packets and packet filtering
• The approaches to packet filtering
• Configure specific filtering rules based on business based

Firewall Configuration and administration: –

• Identify and implement different firewall configuration strategies
• Identify and implement different firewall configuration strategies
• Track firewall log files and follow the basic initial steps in responding to security incidents

Working with proxy servers and application level firewalls: –

• Proxy server and their function
• Critical issue in proxy server configuration
• Determine when a proxy server is not the correct choice

Implementing the Bastion Host: –

• General requirements for installing a bastion host
• Evaluate different options for positioning the bastion host
• Establish a baseline performance level and audit procedures

Encryption – The Foundation for the Virtual Private Network: –

• Role encryption plays in firewall and VPN architectures
• Internet Protocol Security (IPsec) and identify its protocols and modes

Setting Up a Virtual Private Network: –

• Components and essential operations of virtual private networks (VPNs)
• Effective configuration and maintenance of VPNs