Osi Model Checkpoint

Running head: OSI Model CheckPoint

OSI Model Checkpoint

David Bartmess

IT/242

OSI Model Checkpoint

The OSI model is a conceptual framework for communication between computers. It creates a framework upon which the network application can be built by way of protocols for each of the model layers. The layers are Application (layer 7), Presentation (layer 6), Session (layer 5), Transport (layer 4), Network (layer 3), Data Link (layer 2), and Physical (layer 1) layers.

Some of these protocols are LAN, WAN, network, and routing protocols. The WAN protocols work on the Network, Data Link, and Physical layers and define wide-area network communications. LAN protocols work at the Physical and Data Link layers, and define communication over the LAN media. Routing protocols are network-layer protocols that control traffic switching and path of connection determination.

When a connection is received, the Physical layer decodes the message, and passes it through to the Data Link layer. Once there, the Data Link protocols pass it on to the Network layer, and so on until the message reaches the Application layer where the data is presented to the user or application for use.

Switches and routers exist on the Network layer (layer 3), which provides routing functionality that enables multiple connections to be combined into an internetwork.

Routers reside on layer 3, but they may attach layer 2 headers and put the data on the layer 1 connection. But technically, they only reside on layer 3.

|Describe the OSI model and how it relates to a network in 200 to 300 words. Your response |

|should include answers to the following: |

|1. On which layers of the OSI model do WAN protocols operate? |

|2....