Firewalls act as a barrier between a trusted internal network and untrusted external networks (like the internet). They filter incoming and outgoing network traffic based on a set of predefined security rules, allowing or blocking data packets based on their source, destination, and content.
Which of the following is a type of firewall?
IDS & IPS
Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) are tools that monitor network traffic for suspicious or malicious activities. IDS detects and alerts administrators about potential threats, while IPS can actively block or prevent these threats from reaching the network.
Example
Below is an example of intrusion detection software in action.
Intrusion systems are used to identify and respond to suspicious network activities.
Access Control
Implement strong access control mechanisms to ensure that only authorized users and devices can access network resources. This includes user authentication, authorization, and auditing.
Encryption
Encrypt sensitive data as it travels across the network. Technologies like SSL/TLS for web traffic and VPNs (Virtual Private Networks) for remote access can help ensure data confidentiality.
Patch Management
Regularly update and patch network devices and software to address known vulnerabilities. Vulnerable systems are often targeted by attackers.
Regularly updating software and vulnerabilities is important for network security.
Network Segmentation
Divide your network into segments or zones, each with its own security policies and controls. This helps contain and mitigate the impact of a security breach.
Network Segmentation
Security Policies
Develop and enforce network security policies and best practices that define acceptable use, password management, and other security-related behaviors for users and administrators.
Acceptable Use Policy
Network Monitoring
Employ network monitoring tools to continuously monitor network traffic, looking for anomalies that might indicate a security breach.
Below is an screenshot from the popular Wireshark network monitoring tool which analyses packets sent across the network.
What are some common network monitoring tools?
Incident Response Plan
Have a well-defined incident response plan in place to react promptly and effectively to security incidents when they occur. This plan should outline how to contain, investigate, and recover from security breaches.
The basic steps in the process are:
Preparation: Establish a response team, create a plan, and train staff.
Identification: Detect and confirm security incidents.
Containment: Isolate affected areas to prevent further damage.
Eradication: Remove the root cause of the incident.
Recovery: Restore systems and services to normal.
Communication: Notify stakeholders and maintain clear communication.
Documentation: Record incident details and actions taken.
Legal Compliance: Ensure adherence to laws and regulations.
Learn and Improve: Analyze the incident for lessons and update the plan.
Testing: Regularly practice incident response procedures.
What is an incident response plan?
Regular Auditing and Testing
Conduct regular security audits, vulnerability assessments, and penetration testing to identify weaknesses in your network and address them proactively.
network security audit
Backup and Disaster Recovery
Regularly back up critical data and have a disaster recovery plan in place to ensure business continuity in the event of a network breach or other catastrophic events.
What is the purpose of network backup and recovery?
Security Updates and Threat Intelligence
Stay informed about the latest security threats and vulnerabilities by subscribing to threat intelligence feeds and promptly applying security updates and patches.
What is the purpose of regular software updates in network protection?
