OSI Layers Flashcards
OSI layer 1
Transmits binary over physical media between devices
OSI layer 2
Creates and address frames for host to host delivery on LANd and between WANs
OSI layer 3
Creates and addresses packets for delivery between devices
OSI layer 4
Defines data segments and numbers them at the source, transfers the data, and reassembles the data at the destination.
OSI layer 5
Manages sessions between users and synchronizes web sessions, video, etc.
OSI layer 6
Provides data format info to the application
I.e. whether it is a jpg or encrypted etc.
OSI layer 7
Performs services for applications used by the user
Acronym for remembering the OSI layers
All people seem to need data processing
What layer uses frames?
Layer 2 data link
What layer uses packets?
Layer 3 network
TCP/IP layer 1
Network access(OSI 1&2)
TCP/IP layer 2
Internet (OSI 3)
TCP/IP layer 3
Transport (OSI 4)
TCP/IP layer 4
Application (OSI 5-7)
What is used to identify an application at the transport layer?
2 transport layer protocols
TCP-uses segments, connection oriented
UDP-best effort, uses data grams
Well known ports
Reserved for services and applications
Assigned to user processes or applications
Dynamic or private ports
Assigned dynamically to client applications when initiating a connection