1.1 Compare and contrast the Open Systems Interconnection (OSI) model layers and encapsulation concepts. Flashcards
What does OSI stand for?
Open Systems Intercommunication
What are the layers from top to bottom of the OSI model
Application
Presentation
Session
Transport
Network
Data-link
Physical
What happens at the Physical Layer
Bytes of information being sent over physical media
A characteristic/association of the Physical Later
Cables (Copper, Fiber Optic), Wireless Signals (Bluetooth, Wi-Fi)
What happens at the Datalink Layer
Communication network interfaces. Frames are exchanged between network interfaces.
A characteristic/example of the Datalink layer
DLC (Data link control) Protocols:
Media Access Control address for an Ethernet network.
Frames
What happens at the Network layer
The routing layer. Fragments frames traverse over different networks.
A characteristic/example of the Network layer
IP addressing of nodes.
Packets
What happens at the Transport layer
Here is determined how network packets are transported over a network. (which transport Protocols are used)
A characteristic/example of the Transport layer
Transport Protocols: UDP (stateless) and TCP (stateful)
What happens at the Session layer
Communication management (start, stop, and restart) of a connection.
A characteristic/example of the Session layer
Control protocols, tunneling protocols
What happens at the Presentation layer
Character encoding, application encryption. It is often combined with Application layer.
A characteristic/example of the Presentation layer
Application encryption (SSL/TLS)
What happens at the Application Layer
Application that uses the data e.g. HTTP/S, POP3, S/FTP, RDP, etc.
