OSI Model, TCP_IP Suite

Question 1

What does OSI stand for?

Answer 1

Open Systems Interconnection

Question 2

The OSI is divided into how many layers?

Answer 2

7

Question 3

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

Answer 3

Layer 2 - Data Link Layer

Question 4

List the layers of the OSI model in order

Answer 4

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

Question 5

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

Answer 5

Layer 3 - Network Layer

Question 6

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

Answer 6

Layer 7 - Application Layer

Question 7

What is the name of the Layer 3 PDU?

Answer 7

Packet

Question 8

Which networking model is in use in modern networks?

Answer 8

TCP/IP

Question 9

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

Answer 9

Application, Presentation and Session

Question 10

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

Answer 10

3

Question 11

What is the name of the Layer 1 PDU?

Answer 11

Bits

Question 12

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

Answer 12

Transport

Question 13

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

Answer 13

Layer 2 - Data Link Layer

Question 14

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

Answer 14

Link

Question 15

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

Answer 15

Layer 3 - Network Layer

Question 16

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

Answer 16

Layer 3 - Network Layer

Question 17

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

Answer 17

Data Link, and Physical

Question 18

Which layer of the OSI model translates between data formats?

Answer 18

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

Question 19

Which layer of the OSI model includes HTTP and HTTPS?

Answer 19

Layer 7 - Application Layer

Question 20

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

Answer 20

Layer 7 - Application Layer

Question 21

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

Answer 21

2

Question 22

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

Answer 22

encapsulation

Question 23

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

Answer 23

Layer 4 - Transport Layer

Question 24

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

Answer 24

Layer 7 - Application Layer

Question 25

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

Answer 25

De-encapsulation

Question 26

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

Answer 26

same-layer

Question 27

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

Answer 27

adjacent-layer

Question 28

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

Answer 28

Layer 5 - Session Layer

Question 29

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

Answer 29

Layer 4 - Transport Layer

Question 30

What is the name of the layer 4 PDU?

Answer 30

Segment

Question 31

What is the name of the layer 2 PDU?

Answer 31

Frame

Question 32

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

Answer 32

Layer 1 - Physical Layer

Question 33

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

Answer 33

TCP/IP Suite (TCP/IP Model)

Question 34

Which networking model is in use in modern networks?

Answer 34

TCP/IP

Question 35

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

Answer 35

Transport

Question 36

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

Answer 36

Network

Question 37

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

Answer 37

Application

Question 38

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

Answer 38

Internet

Question 39

What are the characteristics of the application layer?

Answer 39

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.

Question 40

What is adjacent layer interaction?

Answer 40

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.

Question 41

What is same layer interaction on OSI model?

Answer 41

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.

Question 42

What are Protocol Data Units?

Answer 42

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.

Question 43

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

Answer 43

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

Question 44

How do you compare OSI vs TCP/IP models?

Answer 44

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.

Question 45

STP, OSPF, DHCP

Answer 45

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.