📑 OSI Model Summary 1.2.8

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8 Terms

1
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Layer 1: Physical PDU and Key Devices

PDU: Bit/Signal. Devices: Transceiver, Cable, Repeater, Media Converter, Hub.

2
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Layer 2: Data Link PDU and Key Address/Devices

PDU: Frame. Address: MAC Address (EUID). Devices: Bridge, Switch, Network Adapter (NIC), Access Point (AP).

3
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Layer 3: Network PDU and Key Address/Devices

PDU: Packet/Datagram. Address: IP Address. Devices: Router, Basic Firewall.

4
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Layer 4: Transport PDU and Key Function

PDU: Segment. Function: Port Numbers (Multiplexing/De-multiplexing) and Reliable Data Delivery.

5
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Layer 5-7: Upper Layers (Session, Presentation, Application)

PDU: Data. Concepts/Devices: Application Protocols (Web, Email), Stateful/Application Layer Security Appliance, Multilayer Switch.

6
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Layer associated with the MAC Address (EUID)

Layer 2 (Data Link).

7
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Layer associated with the IP Address

Layer 3 (Network).

8
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Layer that uses Port Numbers

Layer 4 (Transport).