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CompTIA A+ > Networking OSI Model > Flashcards

Networking OSI Model Flashcards

1
Q

What does OSI stand for?

A

Open Systems Interconnection

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2
Q

How many Layers in the OSI Model?

A

7 Layers

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3
Q

Layer 1 is called

A

Physical Layer

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4
Q

Layer 2 is called

A

Data Link Layer

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5
Q

Layer 3 is called

A

Network Layer

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6
Q

Layer 6 is called

A

Presentation Layer

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7
Q

Layer 4 is called

A

Transport Layer

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8
Q

Layer 5 is called

A

Session Layer

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9
Q

Layer 7 is called

A

Application Layer

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10
Q
  • How many layers are known as Media Layers?
  • What are they?
A

3 Layers

  • Layer 1 - Physical
  • Layer 2 - Data Link
  • Layer 3 - Network
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11
Q

How many layers are known as Host Layers and what are they?

A

4 Layers

Layer 4 - Transport
Layer 5 - Session
Layer 6 - Presentation
Layer 7 - Application

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12
Q

Layer 1 is composed of…

A

Unintelligent Devices such as Network Cables, Wireless Signals (WiFi), Network Hubs, Converters, Modem

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13
Q

What is the purpose of Layer 2?
Device Examples

A

Allows devices to connect to Networks.

Networking Switch, NICs, Access Points

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14
Q

What is the purpose of Layer 3?

A

Logical Addressing. Ensuring that the data arrives to the correct place.

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15
Q

What is the purpose of Layer 4?

A

Ensures that ALL Data is sent. It doesn’t care WHERE, just that it all gets there and correctly.

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16
Q

What is the purpose of Layer 5?

A

Allows for Multiple Access to the same destination.

17
Q

What is the purpose of Layer 6?
What are some features?

A

Helps with the look and feel of the data.

Compression, Encryption, Language presentation

18
Q

What is the purpose of Layer 7?

A

Handles Application services. Mainly Protocols such as HTTPS, SMB, SMTP etc.

19
Q

What are the 2 terms for how layers travel over the network?

A

Encapsulation / Decapsulation

20
Q

How does Encapsulation work?

What Layer does Encapsulation begin at?

A

Layers get ADDED as the data is prepared and sent to other senders.

Layer 7

21
Q

How does Decapsulation work?

What Layer does Decapsulation begin at?

A

Layers get REMOVED as the data is received and processed by receivers

Layer 1

22
Q

What is the DOD Model?

How many Layers?

A

Department of Defence Model

4 Layers

23
Q

What are the Layers of the DOD Model?

A

Network Access Layer (AKA Process)

Internet Layer

Transport Layer (AKA Host-to-Host)

Application Layer

24
Q

What OSI layers are combined in the DOD Model Network Access Layer?

A

Physical and Data Link Layers

26
Q

What OSI layers are combined in the DOD Application Layer?

A
  • Session Layer
  • Presentation Layer
  • Application Layer

CompTIA A+ (21 decks)

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