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Name the 7 layers
- Physical
- Datalink
- Network
- Transport
- Session
- Presentation
- Application
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Layer 1 - name only
Physical
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Layer 2 - Name Only
Data Link
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Layer 3 - Name only
Network
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Layer 4 - Name only
Transport
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Layer 5 - Name only
Session
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Layer 6 - Name only
Presentation
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Layer 7 - Name onlhy
Application
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Physical Layer aka
Level 1
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Data Link layer aka
Level 2
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Network layer aka
Level 3
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Transport layer aka
Layer 4
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Session layer aka
Level 5
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Presentation layer aka
Level 6
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Application layer aka
Level 7
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Layer 2 / Data link layer identifies traffic by
mac address
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Layer 2 / Data link layer occurs at the
switch
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Layer 3 / Network layer identifies traffic by
IP address
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Layer 3 / Network layer occurs at the
router
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Layer 4 / Transport layer identifies traffic by
the port number
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Layer 4 / Transport Layer occurs at the
Software
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Level 7 / Application PDU's are
data
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Level 6 / Presentation PDU's are
data
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Level 5 / Session PDU's are
data
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Level 4 / Transport PDU's are
Segmant
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Level 3 / Network PDU's are
Packet
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Level 2 / Data Link PDU's are
Frame
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Layer 1 / Physical layer media
1's and 0's
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Layer 4 / Transport Layer protocols
- TCP - reliable
- UDP - unreliable - Voip
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Layer 3 / Network Layer protocols
IP
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Layer 2 / Data Link protocols
Ehternet, ATM, PPP, FR
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