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TLY1 CA7.2 OSI model

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TLY1 CA7.2 OSI model

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The OSI model

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TLY1 CA7.2 OSI model
 

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TLY1 CA7.2 OSI modelOnline version

The OSI model

by Muhammad Asif
1

Careers in IT grow with Digital Environments and strong English and Maths . Roles include / , who troubleshoot hardware issues , diagnose operating system problems , and manage user accounts . A configures servers , monitors network devices , and applies knowledge of protocols . A System Administrator ( ) selects hardware for business needs , manages virtual environments , and ensures resilience through backups . A Hardware Engineer designs and tests components like processors and IoT devices . A plans , PaaS , SaaS deployments , integrating cloud with on ? premises systems . A Cybersecurity Analyst examines how hardware , software , networks and smart devices interact to secure access to servers and protect the digital environment .

2

The Architecture of Interconnection : The divides network responsibilities into two groups : the and the . The upper layers , namely , , and , handle application - specific functions and interface with the , focusing on data formatting , , and session management . In contrast , the lower layers , through , manage the physical data flow , , and across networks , ensuring reliable transport and delivery of messages between devices .

3

The Core of Reliability in networking centers on and reliability between devices . It supports two critical protocols : ) , a connection - oriented protocol that establishes a connection and ensures recovery of lost packets , and ) , a connectionless and unreliable protocol that prioritizes speed over guaranteed delivery for small data transfers .

4

The Lower Layers ( Network , Data Link , Physical ) focus on the physical transmission of data . Layer 3 : _____ is responsible for transferring data across a network of networks ( the internet ) . Its core task is logical addressing ( _____ address ) and _____ . It uses the _____ address to deliver data packets and is where routers primarily function . Other Functions : Error control , flow control , and fragmentation . Protocols include _____ , , _____ . Layer 2 : _____ ensures the reliable transfer between directly connected devices . It encodes bits into packets for submission and decodes them upon reception . Sublayers : _____ Layer and . _____ Layer controls network access using the _____ address . LLC Layer manages frame synchronization , flow control , and error checking . Layer 1 : _____ Layer is the lowest layer , concerned with the physical transmission of raw data ( bits ) . It defines the electrical , mechanical , and procedural characteristics of the transmission media and signaling . Functions : Data transmission / reception ( amplifiers / ) , encoding / signaling , and defining network topology . Components : _____ , hubs , , and .

5

The offers a comprehensive framework , with seven layers , while the TCP / IP model has . TCP / IP combines OSI's upper three layers into a single and its lowest two into a , reflecting practical design . OSI is a ; TCP / IP is an . OSI is , whereas TCP / IP is inherently tied to its namesake ) . In essence , the OSI model provides detailed understanding , while the TCP / IP model underpins the .

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