As per Hardening Network Devices National Security Agency Cybersecurity Information, below points are covers in this Course.

The possibility of unwanted access to a network's infrastructure is decreased by hardening network equipment. A malicious cyber actor might take advantage of flaws in device management and configurations to establish presence and maintain persistence within a network. Adversaries are increasingly focusing on targeting specialized and embedded devices, such as routers and switches, rather than only standard endpoints. They achieve this by managing routing protocols, exploiting configuration flaws, and introducing malware into the operating systems.

In the cybersecurity world, that means making that device more secure and resilient to attacks. By hardening a device, you are making it more difficult to break into for hackers.

Minimizing attack surface, or surface of vulnerability, and potential attack vectors

Hardening the Firewall Configuration

Hardening the Network devices Firewalls, Routers and Switches etc

The possibility of unwanted access to a network's infrastructure is decreased by hardening network equipment.

Management interface is kept secure, and access is limited to only those administrators that need access.

Accessing internet resources from offline management

Admin accounts also need to be set so they only have access to the sections of the configuration they need to access and use external authentication.

Password security

Keep Content and Software Updates Current Patch vulnerability

Set up notifications for system and configuration log messages

Monitor system and configuration logs

Practical Firewall Penetration Testing

Firewall penetration testing is the process of locating, investigating and penetrating a certain firewall in order to reach the internal trusted network of a certain system.

Mostly considered to be a key part in external network penetration testing, firewall In this video we discussed the below points.

Locating The Firewall

Conducting Traceroute

Port Scanning

Banner Grabbing

Firewall Enumeration Testing

The Firewall Policy

Firewalking

How to identify Firewall Specific Vulnerabilities

Firewall Penetration Test Process/Checklist

Below Tools used during:

NMAP

HPING3

Firewalk

Network audit tool

Tracert

Traceroute

This course also covered the Best Deployment practices Hardening Network Devices used in the industry and some real-world scenarios including the Tips and Tricks. You will definitely learn a lot in this course and will surely find this valuable.