Introduction to Networking Concepts Flashcards
What is the OSI model? (Definition)
A conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology.
OSI Model (acronym definition)
Open Systems Interconnection model
Layers of the OSI model(in order)
- Physical
- Data Link
- Network
- Transport
- Session
- Presentation
- Application
What is the function of the physical layer of the OSI model?
Transmission and reception of raw bit streams over a physical medium.
What is the function of the data link layer of the OSI model?
Reliable transmission of data frames between two nodes connected by a physical layer.
What is the function of the network layer of the OSI model?
Structuring and managing a multi-node network, including addressing, routing and traffic control.
What is the function of the transport layer of the OSI model?
Reliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing.
What is the function of the session layer of the OSI model?
Managing communication sessions, i.e., continuous exchange of information in the form of multiple back-and-forth transmissions between two nodes.
What is the function of the presentation layer of the OSI model?
Translation of data between a networking service and an application; including character encoding, data compression and encryption/decryption.
What is the function of the application layer of the OSI model?
High-level APIs, including resource sharing, remote file access.
What is a protocol data unit(PDU)?
a single unit of information transmitted among peer entities, such as the individual layers of the OSI model, of a computer network.
The PDU of the transport layer (OSI model):
the segment or the datagram
The PDU of the network layer (OSI model):
the packet.
The PDU of the data link layer (OSI model):
the frame.
The PDU of the physical layer (OSI model):
the bit/symbol.
