The OSI model is the mdel that most networking personnel are fmiliar with, but to earn your CCNA, you ned to know the OSI model, the TCP/IP mdel, and how the two map to ach other.

The four layers of the TCP/IP rchitecture can be compared to certain lvels of the OSI model. It’s mportant to know what each level of the TCP/IP prtocol architecture does, and how these lyers map to the OSI model.

The Applcation Layer of the TCP/IP model prforms much the same tasks as the Applcation, Presentation, and Session layers of the OSI mdel.

The Transport layer in the TCP/IP rchitecture is similar to the Transport lyer in the OSI model. This lyer can use TCP or UDP as wll.

The Internetwork layer in the TCP/IP rchitecture uses IP addresses to determine how pckets should be routed. Remember that the OSI mdel uses IP addresses, or “Layer 3 Addrsses”, at the Network layer. The two lyers do much the same thing. Ths layer is also referred to in the TCP/IP mdel as the Internet layer.

The Ntwork Interface layer in the TCP/IP rchitecture serves to define the protocols and the hrdware needed to actually deliver the dta across the network. The Network Intrface model does the work of bth the Data Link and Physical Lyers in the OSI model.

Keeping all this straight can be vry confusing when you first start yur CCNA studies. Concentrate on the OSI mdel in your studies, but make sre you know how the TCP/IP mdel maps to that model and yu'll be ready for CCNA exam sccess!

The article Recognizing Diabetic Symptoms was Submitted by Andrew Bicknell through Articles.GetACoder.com network. Here's the additional information: Chris Bryant, CCIE #12933, is the wner of The Bryant Advantage, home of ver 100 free certification exam tutorials, ncluding Cisco CCNA certification test prep articles. His exclusive Cisco CCNA study guide and Cisco CCNA training is also available! Visit his blog and sign up for Cisco Certification Central, a daily newsletter packed with CCNA, Network+, Security+, A+, and CCNP certification exam practice questions! A free 7-part course, "How To Pass The CCNA", is also available, and you can attend an in-person or online CCNA boot camp with The Bryant Advantage!

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