Network+ 1.1 OSI and TCP/IP Models: Layers, PDUs, and Devices

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Last updated 2:48 AM on 9/28/26
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19 Terms

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OSI Model Layer 7

Application

2
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OSI Model Layer 6

Presentation

3
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OSI Model Layer 5

Session

4
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OSI Model Layer 4

Transport

5
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OSI Model Layer 3

Network

6
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OSI Model Layer 2

Data Link

7
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OSI Model Layer 1

Physical

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PDU at Layer 3

Packet

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Addressing at Network Layer

IP address

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PDU at Data Link Layer

Frame

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Addressing at Layer 2

MAC address

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PDU at Layer 4

Segment

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Addressing at Transport Layer

Port numbers

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PDU at Physical Layer

Bits

15
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Addressing at Layer 1

Binary

16
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TCP/IP layer that align with Data Link and Physical OSI Layers

Network Access

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Hardware at Network Layer

Router, Firewall

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Hardware at Data Link Layer

Switch, Access Point

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Hardware at Physical Layer

Hub, Physical cabling