OSI Model Flashcards
Addressing
Describing where data should go
Encapsulation
Describing how data messages should be packaged for transmission
PDU
Protocol data unit - network packet encapsulating a data payload from an upper layer protocol with header fields used at the current layer
Signaling
The process of transmitting and receiving encoded data over the network medium. A modulation scheme describes how electrical, light, or radio signals represent bits. Timing and synchronization schemes ensure senders and receivers can identify groups of signals as a chunk or frame of data.
Transceiver
The part of a network interface that sends and receives signals over the network media
Physical Layer (Layer 1)
Provides for transmission and receipt of data bits from node to node. This includes the network medium and mechanical and electrical specifications for using the media.
Repeater
A device that amplifies an electronic signal to extend the maximum allowable distance for a media type
Hub
A multiport repeater, deployed as the central point of connection for nodes
Media converter
A device that converts one media signaling type to another
Data Link Layer (Layer 2)
Responsible for transferring data between nodes.
Network Layer (Layer 3)
Responsible for logical network addressing and forwarding.
Transport Layer (Layer 4)
Responsible for ensuring reliable data delivery.
Session Layer (Layer 5)
Provides services for applications that need to exchange multiple messages.
Presentation Layer (Layer 6)
Transforms data between the formats used by the network and applications.
Application Layer (Layer 7)
Providing support to applications requiring network services (file transfer, printing, email, databases, etc.)
