Osi Articles

1). Cisco CCNA Certification: Defining Broadcast Domains By : Chris Bryant, CCIE #12933
When you're studying to pass the CCNA exam and earn your certification, you're introduced to a great many terms that are either totally new to you or seem familiar, but you're not quite sure what they are. The term "broadcast domain" falls into the latter category for many CCNA candidates. A broadcast domain is simply the group of end hosts that will receive a broadcast sent out by a given host.
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2). Cisco CCNA Certification Exam Tutorial: The OSI Model’s Physical Layer By : Chris Bryant, CCIE #12933
To pass your CCNA exam and earn this coveted certification, you've got to master the seven layers of the OSI model and what each layer does. For those of you taking the two-exam path, you can expect quite a few OSI model questions on the Intro exam. In this seven-part series, we'll spend some time taking a look at each of the OSI model layers, starting with the Physical layer.
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3). Cisco CCNP Exam Tutorial: Defining Collision Domains By : Chris Bryant, CCIE #12933
CCNA exam success depends on mastering the fundamentals, and two important fundamentals are knowing exactly what the terms "collision domain" and "broadcast domain" mean. In this free Cisco tutorial, we'll take a look at the term "collision domain" and how a collision domain is defined. A collision domain is an area in which a collision can occur. Fair enough, but what "collision" are we talking about here? We're talking about collisions that occur on CSMA/CD segments, or Carrier Sense Multiple Access with Collision Detection.
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4). Cisco CCNA Certification Tutorial: Segmenting Your Network By : Chris Bryant, CCIE #12933
When you're getting started on your CCNA studies on your way to earning this certification, you're swamped with network device types that you're familiar with, but not quite sure how to use. Let's look at these networking devices and their main purposes. Hubs and repeaters operate at Layer One of the OSI model, and they have one main purpose - regenerating the electrical signal that Layer One technologies carry.
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5). Cisco CCNA Certification: The (Many) Different Kinds Of Switching By : Chris Bryant, CCIE #12933
When you're studying for your CCNA exam, whether you're taking the Intro-ICND path or the single-exam path, you're quickly introduced to the fact that switching occurs at Layer 2 of the OSI model. No problem there, but then other terms involving switching are thrown in, and some of them can be more than a little confusing. What is "cell switching"? What is "circuit switching"? Most confusing of all, how can you have "packet switching"? Packets are found at Layer 3, but switching occurs at Layer 2.
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6). Cisco CCNA Exam Tutorial: Mapping The OSI Model To The TCPIP Model By : Chris Bryant, CCIE #12933
The OSI model is the model that most networking personnel are familiar with, but to earn your CCNA, you need to know the OSI model, the TCP/IP model, and how the two map to each other. The four layers of the TCP/IP architecture can be compared to certain levels of the OSI model. It’s important to know what each level of the TCP/IP protocol architecture does, and how these layers map to the OSI model.
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