· Allows vendors to focus in specialized areas of the network
What layer defines the electrical, optical, cabling, connectors, and procedural details required for transmitting bits, represented as some form of energy passing over a physical medium?
Physical Layer (Layer 1)
What layer formats data into frames appropriate for transmission onto some physical medium.
Defines rules for when the medium can be used.
Defines means by which to recognize transmission errors?
Data Link Layer (Layer 2)
What layer handles logical addressing, routing, and path determination?
Network Layer (Layer 3)
What layer provides a variety of services between 2 host computers, including connection establishment and termination, flow control,error recovery, and segmentation of large data blocks into smaller parts for transmission?
Transport Layer (Layer 4)
What layer establishes and maintains end-to-end bidirectional flows between endpoints, as well as includes managing transaction flows?
Session Layer (Layer 5)
What layer defines the format and organization of data, as well as includes encryption?
Presentation Layer (Layer 6)
What layer interfaces between network and application software, and also includes authentication services?
Application Layer (Layer 7)
Application (Layer 7)
-Interfaces with the application
-Provides network access to apps
Presentation (Layer 6)
-"Generi-Fies" the data
Session (Layer 5)
-Starts and ends sessions
-Logically keeps sessions seperate
Transport (Layer 4)
-Dictates "how" the data is sent (TCP-reliable) or (UDP-unreliable)