8.5. Planning, Implementing, and Maintaining Network Security and Infrastructure

Security is critically important to ensure the integrity of the network. The way you secure the network will depend on the organization's security policies and the configuration of the network. On a typical network, clients will send requests to servers using TCP/IP, and servers will receive and process the requests. When clients connect to the network using wireless technology or connect to the network using remote access, special considerations must be made to ensure the security of the network is not compromised.

8.5.1. Planning and Configuring Network Protocol Security

In addition to IP addresses, computers on TCP/IP networks use specific protocols and ports for communications. Servers configured to use a specific protocol listen on a specific TCP or UDP port for requests from clients. For example, web servers listen on TCP port 80 for Hypertext Transfer Protocol (HTTP) requests.