Joe Rinehart's Blog

Aside from the general principles of IP addressing and subnetting, any CCNA candidate and/or student needs to know about IP Services.  In the design of the Internet Protocol (IPV4 in particular), there are several functions that other parts of the TCP/IP Suite provide to network users, broadly termed services.  The first part of this set of protocols involves Layer 4 of the OSI Model, namely the Transport Layer, with the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

The first aspect of TCP and UDP regarding services are pretty much identical between the two, so let’s consider that first.  Probably the simplest way to think about this is to consider how the television in your home operates; you don’t have to know all of the electronic details to use it, but knowing the concepts is helpful to making full use of the technology.  Using cable…

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