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14 Cards in this Set
- Front
- Back
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What is a network? |
Anetwork is a combination ofhardware and software that sends datafrom one location to another. The hardware consists of the physical equipment that carries signals from one point ofthe network to another. The software consists ofinstruction sets that make possible the services that we expect from a network. |
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Flow of services of a network |
The sender at the higher layer uses the services of the middle layer. The middle layer uses the services ofthe lower layer. The lower layer uses the services ofthe carrier. |
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The layered model that dominated data communications and networking literature before 1990 was the |
Open System Interconnection (OSI) |
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TCP/IP |
Transmission(Transport) Control Protocol/ Internet Protocol |
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is a multinational body dedicated to worldwide agreement on international standards. |
International Standards Organization (ISO) |
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An ISO standard that covers all aspects ofnetwork communications is the |
Open System Interconnection (OSI) |
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ISO is the organization. OSI is the model. |
ISO is the organization. OSI is the model. |
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is a layered framework for the design of network systems that allows communication between all types ofcomputer systems |
OSI Model |
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It consists ofseven separate but related layers, each ofwhich defines a part ofthe process ofmoving information across a network |
OSI Model |
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The OSI model is not a protocol; it is a model for understanding and designing a network architecture that is flexible, robust, and interoperable. |
The OSI model is not a protocol; it is a model for understanding and designing a network architecture that is flexible, robust, and interoperable. |
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7 layers of OSI Model |
1. Physical 2. Data Link 3. Network 4. Transport 5. Session 6. Presentation 7. Application |
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he passing ofthe data and network information down through the layers ofthe sending device and back up through the layers of the receiving device is made possible by an |
interface between each pair of adjacent layers |
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They deal with the physical aspects of moving data from one device to another (such as electrical specifications, physical connections, physical addressing, and transport timing and reliability). |
Layers 1, 2, and 3-physical, data link, and network-are the network support layers |
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they allow interoperability among unrelated software systems. |
Layers 5, 6, and 7-session, presentation, and application-can be thought of as the user support layers |
