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It 240 Week 2 Checkpoint Osi Model Key

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Appendix C

OSI Model Key Terms Table

Use the table to define the key terms related to the OSI Model. Describe the functions of any hardware connectivity devices and tools listed.

.
| | |Function |
|Term |Definition |(if applicable) |
|Physical layer |This is the first and lowest layer in the |This is when the data is sent on the |
| |seven-layer OSI model. |network media by the NIC. |
|Data link layer |This is layer two of the OSI model and |The Data link layer is responsible for |
| |resides above the Physical Layer and below |communications between adjacent network |
| |the Network Layer. |nodes. |
|Network layer |The Network Layer is layer three of the OSI|The Network Layer is responsible for |
| |model and resides above the Data Link Layer|establishing paths for data transfer |
| |and below the Transport Layer. |through the network. |
|Transport layer |The Transport Layer is layer four of the |The Transport Layer delivers messages |
| |OSI model and resides above the Network |between networked hosts and is responsible |
| |Layer and below

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