Information Security Handbook

Network security

Securely configuring your network hardware and configurations will ensure that you have an effective and secure communication infrastructure. Bear in mind the following principles and guidelines:

• Ports, protocols, and services:
  • Ensure that you extend the concepts of least privilege and least functionality to the network.
  • Block any outbound traffic that is not required as this can be used to exfiltrate data from your network.
  • The same goes for inbound traffic. If you do not need a port, protocol, or service to be open, close it.
• Traffic monitoring:
  • Ensure that you are monitoring the outbound ports that you allow with a full packet capture and analysis capability to ensure that the traffic that is leaving your network ...