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CCNA 200-125 > The OSI Model > Flashcards

The OSI Model Flashcards

1
Q

What is Layer 1 of the OSI model?

A

Physical

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2
Q

What is Layer 2 of the OSI model?

A

Data Link

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3
Q

What is Layer 3 of the OSI model?

A

Network

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4
Q

What is Layer 4 of the OSI model?

A

Transport

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5
Q

What is Layer 5 of the OSI model?

A

Session

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6
Q

What is Layer 6 of the OSI model?

A

Presentation

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7
Q

What is Layer 7 of the OSI model?

A

Application

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8
Q

Routers operate at which layer of the OSI model?

A

Layer 3 - Network

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9
Q

Switches operate at which layer of the OSI model?

A

Layer 2 - Data Link

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10
Q

What is the purpose of the OSI model?

A

To provide a means of describing how data is transmitted over a network.

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11
Q

What are the six main benefits of the OSI model?

A 
Reduces complexity
Standardizes interfaces
Facilitates modular engineering
Ensures inter-operable technology
Accelerates evolution
Simplifies teaching and learning
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12
Q

What is the function of Layer 1 of the OSI model?

A

Binary Transmission:

Defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link.

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13
Q

What is the function of Layer 2 of the OSI model?

A

Access to Media:

Defines how data is formatted for transmission and how access to the network is controlled.
Provides error detection.

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14
Q

What is the function of Layer 3 of the OSI model?

A

Data Delivery:

Routes data packets.
Selects best path to deliver data.
Provides logical addressing and path selection.

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15
Q

What is the function of Layer 4 of the OSI model?

A

End to End Connections:

Handles transportation issues between hosts.
Ensures data transport reliability.
Establishes, maintains, and terminates virtual circuits.
Provides reliability though fault detection and recovery information flow control.

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16
Q

What is the function of Layer 5 of the OSI model?

A

Inter-host Communication:

Establishes, manages, and terminates sessions between applications.

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17
Q

What is the function of Layer 6 of the OSI model?

A

Data Representation:

Ensures that data is readable by receiving system.
Formats data.
Structures data.
Negotiates data transfer syntax for application layer.
Provides encryption.

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18
Q

What is the function of Layer 7 of the OSI model?

A

Network Processes to Applications:

Provides network services to application processes (e.g. email, file transfer, terminal emulation).
Provides user authentication.

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19
Q

Bits are found at what layer of the OSI model?

A

Layer 1 - Physical

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20
Q

Frames are found at what layer of the OSI model?

A

Layer 2 - Data Link

21
Q

Packets are found at what layer of the OSI model?

A

Layer 3 - Network

22
Q

Segments are found at what layer of the OSI model?

A

Layer 4 - Transport

23
Q

Flow control takes place at which layer of the OSI model?

A

Layer 4 - Transport

24
Q

Encryption takes place at which layer of the OSI model?

A

Layer 6 - Presentation

25
Q

True or False: The network layer uses physical addresses to route data to destination hosts.

A

False: The network layer uses logical addresses to route data to destination hosts.

26
Q

Error detection and recovery takes place at which layer of the OSI model?

A

Layer 4 - Transport

27
Q

Which layer of the OSI model establishes, maintains, and terminates communications between applications located on different devices?

A

Layer 5 - Session

28
Q

IP is implemented at which OSI model layer?

A

Layer 3 - Network

29
Q

Which layer of the OSI model handles the formatting of application data so that it will be readable by the destination system?

A

Layer 6 - Presentation

30
Q

Which layer of the OSI model translates between physical and logical addresses?

A

Layer 3 - Network

31
Q

What does OSI stand for?

A

Open Systems Interconnect

32
Q

Repeaters and hubs operate at which layer of the OSI model?

A

Layer 2 - Data Link

33
Q

Bit synchronization is handled at which layer of the OSI model?

A

Layer 1 - Physical

34
Q

True or False: most logical addresses are preset in network interface cards at the factory.

A

False: Physical (MAC) addresses are (except in rare instances) preset at the factory. Logical (IP) addresses are configured by a network administrator.

35
Q

Bridges operate at which layer of the OSI model?

A

Layer 2 - Data Link

36
Q

Which layer of the OSI model is responsible for packet sequencing, acknowledgments, and requests for re-transmission?

A

Layer 4 - Transport

37
Q

How many layers are in the OSI model?

A

7

38
Q

How many layers are in the TCP/IP model?

A

4

39
Q

What is Layer 1 of the TCP/IP model?

A

Network Access

40
Q

What is Layer 2 of the TCP/IP model?

A

Internet

41
Q

What is Layer 3 of the TCP/IP model?

A

Transport

42
Q

What is Layer 4 of the TCP/IP model?

A

Application

43
Q

Layer 1 of the TCP/IP model maps to what layer(s) in the OSI model?

A

Layer 1 - Physical

Layer 2 - Data Link

44
Q

Layer 2 of the TCP/IP model maps to what layer(s) in the OSI model?

A

Layer 3 - Network

45
Q

Layer 3 of the TCP/IP model maps to what layer(s) in the OSI model?

A

Layer 4 - Transport

46
Q

Layer 4 of the TCP/IP model maps to what layer(s) in the OSI model?

A

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

47
Q

TCP Header is found at what layer of the OSI model?

A

Layer 4 - Transport

48
Q

IP Header is found at what layer of the OSI model?

A

Layer 3 - Network

49
Q

Ethernet Header is found at what layer of the OSI model?

A

Layer 2 - Data Link

CCNA 200-125 (6 decks)

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