SECURE NETWORK DESIGN AND ENGINEERING

The enterprise cannot afford to have a single weakness in the newly installed operating system. It must consider many factors such as firewall configuration as an integral part of the layered security approach to secure the server and the client’s operating systems.
Windows operating system has inbuilt firewall features that need to be configured to block inbound and outbound traffic for the domain, private, and public profiles. To configure the basic firewall rules on the client and the server, a security administrator would need to follow the following steps.

From the system’s control panel, open the Basic Windows Firewall Settings to check the current status.
On the left pane, select the link “Turn Windows Firewall on or Off”. This option will allow the security administrator to customize settings for both Private and Public Networks; both settings must be turned “ON”.
Advanced settings can also be used to customize firewall settings for inbound and outbound traffic. These settings will help the enterprise control traffic to and from three profiles (the domain, private, and public). Suppose employees are allowed to use company-provided laptops in public, then inbound firewall rules can help prevent traffic from untrusted networks from entering the private part of the client and server systems. Outbound rules should be configured to control traffic, leaving the server and define which ports to pass through and to which destination.

Approach for the Implementation
Even after configuring firewall rules, the enterprise will still need a layered-security to secure its systems and the network. Based on the provided scenario, the enterprise might need to redesign the entire network infrastructure to cater for more security needs. Before doing that, it needs to have a policy guideline that sets security standards and the rules users, and system administrators need to follow, and security strategies to be deployed.
The network infrastructure can be redesigned to divide the network into security segments: the outside and inside of the network. These segments can then be secured through the implementation of the following:

Application-level and perimeter firewalls – the firewall would help filter and even block unrequested traffic destined to the inside of the network. Assuming that there are servers the enterprise wants to be protected, a security administrator must consider the best position to place a perimeter firewall. For example, it can be placed in front of the main router to filter and ensure that packets are forwarded to the right tunnel.
A firewall in a subnet – Assuming that the network infrastructure was redesigned to include some subnets, the enterprise might need to control traffic destined for those subnets using a firewall. The firewall would be configured to block traffic based on IP addresses and specific ports.

By implementing such security strategies, the enterprise would have a layered-security.
Summary of the Lab Experience
As demonstrated in the lab, small, medium, and large-sized enterprises need to configure firewall rules to restrict inbound and outbound traffic from their system. Blocking outbound traffic would help prevent leaks of confidential information, while blocking inbound traffic prevents applications from accessing the internet, installing updates and so forth. Before setting firewall rules, an enterprise must establish policy rules that would guide users and security administrators in implementing the best security practices. To do that, it might also need to use security tools such as Microsoft Security Compliance Manager to check, modify, create new baselines and even compare the difference between the new and existing ones for security compliance.
 
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