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Network #3

From 2.0 [layers lesson]

TermDefinition
Protocol Rules that the sender and receiver have to follow to communicate effectively
Protocol layering Used when communication is complex
Principles of Protocol layering Make sure each layer can complete two opposite tasks, one in each direction. The two objects under each layer at both sites should be identical
Open Systems Interconnection(OSI) reference model Created to standardize network communications. It features seven layers
TCP/IP protocol suite Group of communications protocols used for the internet and similar networks. Also known as the DoD model
Layers Physical, Data link, Network, Transport, (Session, Presentation), Application
Protocol Data Unit(PDU) Units of data object in each layer or protocol
TCP/IP abbreviation Transmission Control Protocol (TCP) / Internet Protocol (IP)
Physical layer Controls the movements of bits moving from one node to the next. PDU - Bits. Address - N/A
Data link layer Controls the movements of frames from one node to the next. PDU - Frame. Address - Physical address / MAC address
Network layer Controls the transportation of individual packets going from the source host to the destination host. PDU - Packet. Address - Logical address / IP address
Transport layer Controls the transportation of a message from one process(source node) to another process(destination node). PDU - Segment. Address - Port number
Application layer Provides the service to the user. Not a software application. It is the network protocol by which the software application and another host interact. PDU - Messages. Address - Name / Application specific
Addressing Any communication that involves two parties needs two addresses: source address and destination address
Internet Protocol(IP) address A unique address that identifies a device on the internet or a local network
Encapsulation / Decapsulation Header is encapsulated from the later below, and decapsulated for the layer above
Created by: jolly_n4
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