The Network Security. Org

TCP and IP Options

I have spoken at length before about the TCP/IP protocol suite and its dozens of protocols. When people refer to the TCP/IP protocol suite they are referring to all layers of the OSI Reference model. With that in hand we most certainly have dozens of various protocols that come to mind. The vast bulk of these dozens of protocols reside at the application layer. Many of these application layer protocols have any number of vulnerabilities associated with them.

What of the ?four core protocols? though? What are they, what do they do, and why are they called the ?core? protocols? The four core protocols as listed in the article description are IP for routing, TCP and UDP for transport, and lastly ICMP for error message handling. These protocols are considered core ones as every operating system must have them in order to be able to talk ie: send packets. So whether it be say Mac or BSD or other type operating system they all have these core protocols, albeit sometimes as implemented by a different stack. Think Novell for a good example of that. TCP and IP Options

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