CCNA INTRO: Introduction to Cisco Networking Technologies by Todd Lammle

By Todd Lammle

Take your first step to CCNA certificationFrom bestselling writer Todd Lammle comes the main updated ebook on CCNA examination 640-821, the 1st examination in Cisco's renowned two-exam Cisco qualified community affiliate (CCNA) certification tune. comprehend networking for the small or domestic place of work industry, arrange for the examination, and procure the talents you would like with this complete consultant. inside of you will find:Complete insurance of all examination pursuits in a scientific procedure, so that you should be convinced you are getting the guide you needPractical hands-on workouts to augment severe skillsReal-world eventualities that convey you existence past the school room and placed what you have got realized within the context of tangible activity rolesChallenging overview questions in every one bankruptcy to organize you for examination dayExam necessities, a key function on the finish of every bankruptcy that identifies serious components you need to develop into informed in sooner than taking examination 640-821A convenient tear card that maps each reputable examination goal to the corresponding bankruptcy within the booklet, so that you can song your examination prep aim by means of objectiveLook within for entire assurance of all examination goals.

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Extra resources for CCNA INTRO: Introduction to Cisco Networking Technologies Study Guide (Exam 640-821)

Sample text

Reliable data transport employs a connection-oriented communications session between systems, and the protocols involved ensure that the following will be achieved: The segments delivered are acknowledged back to the sender upon their reception. Any segments not acknowledged are retransmitted. Segments are sequenced back into their proper order upon arrival at their destination. A manageable data flow is maintained in order to avoid congestion, overloading, and data loss. The purpose of flow control is to provide a means for the receiver to govern the amount of data sent by the sender.

The Session Layer The Session layer is responsible for setting up, managing, and then tearing down sessions between Presentation layer entities. This layer also provides dialogue control between devices, or nodes. It coordinates communication between systems and serves to organize their communication by offering three different modes: simplex, half duplex, and full duplex. To sum up, the Session layer basically keeps different applications’ data separate from other applications’ data. The Transport Layer The Transport layer segments and reassembles data into a data stream.

Another layer and protocol will handle the other functions. The technical term for this idea is binding. The communication processes that are related to each other are bound, or grouped together, at a particular layer. Advantages of Reference Models The OSI model is hierarchical, and the same benefits and advantages can apply to any layered model. The primary purpose of all such models, especially the OSI model, is to allow different vendors’ networks to interoperate. fm Page 12 Tuesday, September 5, 2006 6:23 PM 12 Chapter 1 Internetworking Advantages of using the OSI layered model include, but are not limited to, the following: It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.

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