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CCNA > OSI Model, TCP_IP Suite > Flashcards

OSI Model, TCP_IP Suite Flashcards

1
Q

What does OSI stand for?

A

Open Systems Interconnection

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2
Q

The OSI is divided into how many layers?

A

7

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3
Q

Which layer of the OSI model provides node-to-node connectivity?

A

Layer 2 - Data Link Layer

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4
Q

List the layers of the OSI model in order

A
  1. Physical, 2. Data Link, 3. Network, 4. Transport, 5. Session, 6. Presentation, 7. Application.
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5
Q

Which layer of the OSI model provides connectivity to end hosts on different networks?

A

Layer 3 - Network Layer

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6
Q

Which layer of the OSI model identifies communication partners and synchronizes communication?

A

Layer 7 - Application Layer

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7
Q

What is the name of the Layer 3 PDU?

A

Packet

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8
Q

Which networking model is in use in modern networks?

A

TCP/IP

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9
Q

OSI Model […] Layer(s) = TCP/IP Application Layer?

A

Application, Presentation and Session

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10
Q

Routers operate at Layer […] of the OSI model.

A

3

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11
Q

What is the name of the Layer 1 PDU?

A

Bits

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12
Q

OSI Model Transport Layer = TCP/IP […] Layer.

A

Transport

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13
Q

Which layer of the OSI model detects and corrects Physical Layer errors?

A

Layer 2 - Data Link Layer

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14
Q

OSI Model Data Link, Physical Layers = TCP/IP […] Layer.

A

Link

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15
Q

Which layer of the OSI model provides logical addressing (IP addresses)?

A

Layer 3 - Network Layer

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16
Q

Which layer of the OSI model provides path selection between source and destination?

A

Layer 3 - Network Layer

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17
Q

OSI Model […] Layer(s) = TCP/IP Link Layer.

A

Data Link, and Physical

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18
Q

Which layer of the OSI model translates between data formats?

A

Layer 6 - Presentation Layer (Ex. Encryption and Decryption of data)

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19
Q

Which layer of the OSI model includes HTTP and HTTPS?

A

Layer 7 - Application Layer

20
Q

Which layer of the OSI model provides process-to-process communication?

A

Layer 7 - Application Layer

21
Q

Switches operate at Layer […] of the OSI model.

A

2

22
Q

The process of adding additional headers and trailers to data before it is sent over the network is called […].

A

encapsulation

23
Q

Which layer of the OSI model provides host-to-host communication?

A

Layer 4 - Transport Layer

24
Q

Which layer of the OSI model interacts with software applications on a computer?

A

Layer 7 - Application Layer

25
Q

The process of removing headers and trailers from data received over a network.

A

De-encapsulation

26
Q

Interaction between the same OSI layers on different devices is called […] interaction.

A

same-layer

27
Q

Interaction between the different OSI layers on the same device is called […] interaction.

A

adjacent-layer

28
Q

Which layer of the OSI model establishes, manages, and terminates connections between the local and remote applications?

A

Layer 5 - Session Layer

29
Q

Which layer of the OSI model segments and reassembles data for communication between end hosts?

A

Layer 4 - Transport Layer

30
Q

What is the name of the layer 4 PDU?

A

Segment

31
Q

What is the name of the layer 2 PDU?

A

Frame

32
Q

Which layer of the OSI model defines physical characteristics of the medium used to transfer data between devices?

A

Layer 1 - Physical Layer

33
Q

Which networking model was developed by the United States Department of Defense?

A

TCP/IP Suite (TCP/IP Model)

34
Q

Which networking model is in use in modern networks?

A

TCP/IP

35
Q

OSI Model […] Layer(s) = TCP/IP Transport Layer

A

Transport

36
Q

OSI Model […] Layer(s) = TCP/IP Internet Layer.

A

Network

37
Q

OSI Model Application, Presentation, Session Layers = TCP/IP […] Layer

A

Application

38
Q

OSI Model Network Layer = TCP/IP […] Layer.

A

Internet

39
Q

What are the characteristics of the application layer?

A

This layer is closest to the end user.
Interacts with software applications. (Ex: Web browser)
HTTP and HTTPS are layer 7 protocols.
Functions of layer 7 include:
- Identifying communication partners
- Synchronizing communication
These are same layer interactions.

40
Q

What is adjacent layer interaction?

A

Adjacent-Layer Interaction refers to how the adjacent networking layers in the same computer interact to each other. The higher-layer protocol uses the next lower-layer protocol to perform the service it needed; the lower layer provides a service to the layer above it.

41
Q

What is same layer interaction on OSI model?

A

Same layer interaction is when we look at communication between two devices using a single protocol at a single layer… For example, we might look at same-layer interaction between a web browser and a web server at the application layer, ignoring how the lower layers are transporting the data.

42
Q

What are Protocol Data Units?

A

Data, Segments, Packets, Frames and Bits are called Protocol Data Units. (PDUs) Layer 1 PDU is a bit. There are a total of 5 PDUs.

43
Q

How many layers are there in a TCP/IP model?

A

There are 4 layers in a TCP/IP model.
4. Application layer
3. Transport layer
2. Internet (NW) layer
1. Link layer

44
Q

How do you compare OSI vs TCP/IP models?

A

The first three layers of the OSI model (Application, Presentation and Session) are folded into Application layer in TCP/IP.

Transport layer in OSI is the same transport layer in TCP/IP.

Network layer in OSI is called Internet layer in TCP/IP.

Datalink and Physical layers in OSI model is folded into one and called Link layer in TCP/IP.

45
Q

STP, OSPF, DHCP

A

STP - is a layer 2 protocol
OSPF - Layer 3 protocol - Discovers the best path
IP - Layer 3
DHCP - Layer 7 protocol - Helps automatically get an IP address.

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