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Chapter 3. Infrastructure and Connectivity > Understanding Network Protocols
3.8. Understanding Network Protocols
Your network may have network protocols running in addition to TCP/IP, and each of these protocols may be vulnerable to outside attack. Some protocols (such as NetBEUI, DLC, and other more primitive protocols) aren't routable and, therefore, aren't subject to attack. Of course, there is a great big "unless": If your router or firewall is configured to pass them, some of these protocols can be imbedded in TCP/IP and may be passed to other systems.
The major protocols used by TCP/IP for maintenance and other activities include those discussed in the following list:
