Flash Cards from Professor - OSI Model

Question 1

Which OSI layer assumes the responsibility for opening, closing, and maintaining connections between applications?

Network layer
Data link layer
Application layer
Session layer

Answer 1

Session layer

Question 2

Authentication and authorization take place at the:

Application layer of the OSI model
Network layer of the OSI model
Session layer of the OSI model
Presentation layer of the OSI model

Answer 2

Session layer of the OSI model

Question 3

Data format translation, data compression, and data encryption/decryption take place at the:

Application layer of the OSI model
Presentation layer of the OSI model
Session layer of the OSI model
Transport layer of the OSI model

Answer 3

Presentation layer of the OSI model

Question 4

Which of the following protocols reside(s) at the application layer of the OSI model? (Select all that apply)

ATM
HTTP
FTP
IP
SMTP
TCP/UDP

Answer 4

HTTP
SMTP

Question 5

In the context of the OSI model, the term “Data encapsulation” is used to describe a process where each layer of the OSI model adds its own control information to the original data that is being passed across the layers from the physical layer up to the application layer.

True
False

Answer 5

False

Question 6

In the OSI model, the physical layer PDU is known as:

Answer 6

Bit

Question 7

In the OSI model, the layer 2 PDU is called:

Answer 7

Frame

Question 8

Which of the following answers refer to the OSI layer 2 header data? (Select 2 answers)

Destination port number
Source MAC address
Destination MAC address
Source port number

Answer 8

Source MAC address
Destination MAC address

Question 9

In the OSI model, the layer 3 PDU is known as:

Answer 9

Packet

Question 10

Which of the following answers refer to examples of network layer header data? (Select 2 answers)

Source IP address
Destination IP address
Source port number
Destination port number

Answer 10

Source IP address
Destination IP address

Question 11

In the OSI model, the layer 4 TCP PDU is known as:

Answer 11

Segment

Question 12

Which of the following answers does not refer to the OSI TCP segment header?

Layer 4 header
Source port number
Destination port number
Layer 3 header
Sequence number
Checksum field

Answer 12

Layer 3 header

Question 13

In the OSI model, the layer 4 UDP PDU is called:

Answer 13

Datagram

Question 14

Which of the following answers does not refer to the OSI UDP datagram header?

Length in bytes
Destination port number
Layer 4 header
Source port number
Checksum field
Layer 3 header

Answer 14

Layer 3 header

Question 15

In the OSI model, the payload data (a.k.a. user data) is the actual data that is being nested between header and tail control information.
True
False

Answer 15

True