OSI Model Flashcards
The _____ layer is responsible for network applications (like HTTP or FTP) and their production of data to be transferred over the network.
Application
The _____ layer is responsible for translating data from the application layer into the format required to transmit the data over the network as well as encrypting the data for security if encryption is used.
Presentation
The _____ layer is responsible for connection establishment, session maintenance, and authentication.
Session
The _____ layer provides services to the application layer and receives services from the network layer. It is responsible for the reliable delivery of data. It segments and reassembles data in the correct order for the receiving device. It may also handle the reliable delivery of data and any retries of data that are lost or corrupted (for example, TCP does this). This layer is often called the heart of OSI.
Transport
The _____ layer is responsible for the transmission of data between hosts in different networks as well as routing of data packets. This layer is implemented in routers and some switches.
Network
The _____ layer is responsible for the delivery of data to the receiving device or node. This layer is implemented in switch and bridge devices as well as anything with a network interface, like a wireless or wired network card.
Data Link
The _____ layer is responsible for the physical connections of the devices in the network. This layer is implemented in hub, repeater, modem devices, and physical cabling.
Physical
1st layer
Physical
2nd layer
Data Link
3rd layer
Network
4th layer
Transport
5th layer
Session
6th layer
Presentation
7th layer
Application
HTTP, FTTP, Telnet, NTP, DHCP, PING
Application, Presentation, and Session layers
