Compare And Contrast OSI Model Layers Flashcards
Promotes understanding of how components in a network system work by separating the function of hardware and software components to seven discrete layers which each perform a different group of tasks required for network communication.
Open Systems Interconnection (OSI) Reference Model
Two or more computer systems that are linked by a transmission medium and share one or more protocols that enable them to exchange data
Network
Set of rules for exchanging data in a structured format
Network protocol
Describing where data messages should go. Unique identifier for a network node such as a MAC address, IPv4 address or IPv6 address.
Addressessing
Describing how data messages should be packaged for transmission. A method by which protocols build data packets by adding headers and trailers to existing data.
Encapsulation
Responsible for transmission and receipt of the signals that represent bits of data from one node to another node. This includes the network medium and mechanical and electrical specifications for using the media.
Physical layer
Physical signal conductor provided between two nodes
Cabled
Uses free space between nodes such as microwave radio
Wireless
Layout of nodes and links as established by the transmission media
Physical topology
Mechanical specifications for the network medium such as cable specifications, medium connector and pin-out details or radio transceiver specifications
Physical interface
Part if a network interface that sends and receives signals over network media (part of PHY)
Transceiver
A device that amplifies an electronic signal to extend the maximum allowable distance for a media type (part of PHY)
Repeator
A multiport repeater deployed as the central point of connection for nodes (part of PHY)
Hub
A device that converts one media signaling type to another (part of PHY)
Media converter
A device that performs some type of signal modulation and demodulation such as sending digital data over an analog line (part of PHY)
Modem
Responsible for transferring data between nodes on the same logical segment
Data Link layer
Joins an end system host to network media (cabling or wireless) and enables it to communicate over the network by assembling and disassembling frames (part of layer2)
Network adapter or NIC
Type of intermediate system the joins physical network segments while minimizing the performance reduction of having more nodes on the same network (part of layer 2)
Bridge
An advanced type of bridge with many ports (part of layer 2)
Switch
Allows nodes with wireless network cards to communicate and creates a bridge between wireless networks and wired ones
Wireless access point (AP)
Responsible for moving data around a network of networks known as an inter network or the Internet for logical network addressing and forwarding.
Network layer
An intermediate system working at the network layer capable of forwarding packets around logical networks of different layer 1 and layer 2 types.
Router
OSI model layer responsible for ensuring reliable data delivery.
Transport layer
OSI model layer that provides services for applications that need to exchange multiple messages (dialog control).
Session layer 5
OSI model layer that transforms data between the formats used by the network and applications.
Presentation layer 6
OSI model layer providing support to applications requiring network services like file transfer, printing, email, databases and so on.
Application layer 7
