7 Layers of the OSI model
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Application Layer | Receives raw data from the application in use and provides services, such as file transfer and message exchange to the application (and thus the user) ...HTTP, DNS, FTP, SMTP...etc
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| Presentation Layer | Responsible for the manner in which the data from the application layer is represented to the application layer on the destination device...MIME, XDR...etc
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| Session Layer | Responsible for adding information to the packet that makes a communication session between a service or application on the source device possible with the same service or application on the destination device. The app or service is communicated between
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| Transport Layer | Establishes a session between two physical systems. It can be connection oriented or connection-less. At this layer the PDU is a called a segment
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| Network Layer | information required to route the packet is added in the form of a source and destination logical address. In TCP/IP this is in terms of a source and destination IP address. At this layer the PDU is called a packet...IP, ICMP, IGMP, ARP
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| Data Layer | Responsible for determining the destination physical address. in the ethernet this is called the MAC. Adds a trailer at the end of the frame. trailer info is user to verify data integrity. At this layer the PDU is called a frame
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| Physical Layer | responsible for turning the information into bits and sending it out on the medum.
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Dks0512
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