OSI Model

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23 Terms

1
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Order of OSI Layers

  1. Physical

  2. Data Link

  3. Network

  4. Transport

  5. Session

  6. Presentation

  7. Application

2
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What is the Physical Layer?

  • Responsible for transmission and receipt of the bit stream to/from nodes

3
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Physical Layer Protocols/Devices

Protocols

  • Ethernet

  • USB

  • Bluetooth

Devices

  • Hub

  • Repeater

4
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What is the Data Link Layer?

  • Responsible for providing point-to-point validity of the data

5
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Data Link Layer Protocols/Devices

Protocols

  • Point to point

  • Serial Line

  • ATM

Devices

  • Switch

  • Bridge

  • Wireless AP (WAP)

6
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What is the Network Layer?

  • Enables internetworking, provides globally unique addressing for every node in the network

  • Determines routes between source and destination networks

7
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Network Layer Protocols/Devices

Protocols

  • IP

  • Address Resolution (ARP)

  • ICMP (ping)

Devices

  • Router

  • Layer 3 Switch

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What is the Transport Layer?

  • Responsible for host-to-hosts integrity of transmission

  • Detects damaged or lost packets and generates retransmit requests

9
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Transport Layer Protocols/Devices

Protocols and Devices

  • TCP/UDP

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What is the Session Layer?

  • Establishes, maintains, and terminates host-to-host interactive sessions

  • Used to uniquely identify a service application, or function on a host via ports

11
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Session Layer Protocols/Devices

Protocols

  • NFS

  • RFC

  • SQL

  • NetBIOS

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What is the Presentation Layer?

  • Responsible for managing the way data is presented 

13
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Presentation Layer Protocols/Devices

Protocols

  • ASCII

  • SSL

  • JEPG

  • GIF

  • IMAP

14
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What is the Application Layer?

  • Provides the interface between users applications and network’s services

15
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Application Layer Protocols/Devices

Protocols

  • HTTP

  • DNS

Device

  • User Application

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What Layers fall under Network Access?

  • Physical

  • Data link

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What Layers fall under Internet?

  • Network

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What Layers fall under Transport?

  • Transport

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What Layers fall under Application?

  • Session

  • Presentation

  • Application

20
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Physical Layer Data Type

  • Bits

21
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Data Link Layer Data Type

  • Frames

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Network Layer Data Type

  • Packets

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Transport Layer Data Type

  • Segments