| Layer |
Function |
| Layer 7 |
Application |
| Layer 7 |
provides network services to application processes (such as e-mail, file transfer & terminal emulation) |
| Layer 7 |
the interface that allows the application (program) to communicate |
| Layer 6 |
Presentation |
| Layer 6 |
Like an interpreter |
| Layer 6 |
Data representation |
| Layer 6 |
ensure that data is readable by the receiving system |
| Layer 6 |
format of data |
| Layer 6 |
data structures |
| Layer 6 |
negotiates data transfer syntax for application layer |
| Layer 5 |
Session |
| Layer 5 |
interhost communication |
| Layer 5 |
establishes, manages, and terminates sessions between application |
| Layer 4 |
Transport |
| Layer 4 |
end-to-end connection reliability |
| Layer 4 |
ensures integrity of data |
| Layer 4 |
concerned with data transport issues between hosts |
| Layer 4 |
data transport reliability |
| Layer 4 |
establish, maintain, terminate virtual circuits |
| Layer 4 |
fault detection and recovery |
| Layer 4 |
information flow control |
| Layer 4 |
TCP: Transmission Control Protocol |
| Layer 3 |
Network |
| Layer 3 |
Addresses & best path |
| Layer 3 |
provides connectivity and path selection between two end systems |
| Layer 3 |
domain of routing |
| Layer 3 |
IP: Internet Protocol |
| Layer 3 |
Logical Addresses |
| Layer 2 |
Data Link |
| Layer 2 |
Access to media |
| Layer 2 |
provides reliable transfer of data across media |
| Layer 2 |
physical address, network topology, error notification, flow control |
| Layer 2 |
physical address: MAC address (Media Access Control) |
| Layers 2 & 3 |
only layers concerned with addressing |
| Layer 2 |
Protocol: Ethernet |
| Layer 2 |
Protocol: Frame Relay |
| Layer 1 |
Physical |
| Layer 1 |
binary transmission |
| Layer 1 |
wires, connectors, voltages, data rates |
MedTemCP5 Word+Pics
