OSI Data Link Layer: Accessing the Media

Question 1

Basic Services offered by Layer 2

Answer 1

• Allows the upper layers to access the media using techniques such as framing
• Controls how data is placed onto the media and is received from the media using techniques such as media access control (MAC) and error detection

Question 2

Main responsibility of the Data Link Layer

Answer 2

It is responsible for the exchange of frames between nodes over the media of a physical network

Question 3

How the intermediary devices process a frame

Answer 3

• It accepts the frame from a medium
• Decapsulates the frame into a packet
• Constructing a new frame appropriate for the next media
• Forwarding the packet inside the new frame across the next segment of the physical network

Question 4

What do you call the technique of getting the frame on and off media

Answer 4

media access method or MAC method

Question 5

Elements in a Data Link Layer frame includes what elements?

Answer 5

• Data
• Header
• Trailer

Question 6

It is an element in a Data Link Frame that refers to the packet from the network layer

Answer 6

Data

Question 7

It is an element in a Data Link Frame that refers to the control information, such as addressing, located at the beginning of the PDu

Answer 7

Header

Question 8

It refers to the control information added to the end of the PDU

Answer 8

Trailer

Question 9

Parts of a Data Frame Header

Answer 9

• Frame Start
• Addressing
• Type
• Quality

Question 10

Parts of a Data Frame Trailer

Answer 10

• Error Detection
• Frame Stop

Question 11

The typical frield types in a Data Link Frame

Answer 11

• Start and Stop indicator fields
• Addressing and naming fields
• Type field
• Quality
• Data Field

Question 12

It is a typical field type in a data link frame that refers to the beginning and end limits of the frame

Answer 12

Start and Stop indicator fields

Question 13

It is a typical field type in a data link frame that refers to the destination and/or source devices

Answer 13

Addressing or naming fields

Question 14

It is a typical field type in a data link frame that refers to the type of PDU contained in the frame

Answer 14

Type Field

Question 15

It is a typical field type in a data link frame that refers to the control fields

Answer 15

Quality

Question 16

It is a typical field type in a data link frame that refers to the frame payload (network layer packet)

Answer 16

Data Field

Question 17

Data link layer is implemented in both software and hardware, in hardware it is embodied in a what?

Answer 17

Network Interface Card (NIC)

Question 18

This physical entity in the data link layer is inserted into the systemm bus of a computer and makes the connection between running software processes on the computer and the physical media

Answer 18

Network Interface Card (NIC)

Question 19

The two common LAN sublayers

Answer 19

Logical Link Control (LLC)
MAC

Question 20

It is a common LAN sublayer that places information in the frame that identifies which network layer protocol is being used for the framw

Answer 20

Logical Link Control

Question 21

It is a common LAN sublayer that refers to the provider of data link layer addressing and delimiting of data according to the physical signaling requirements of the medium and the type of data link layer protocol in use

Answer 21

MAC

Question 22

Engineering Organizations that define Open Standards and Protocols that apply to the data link layer

Answer 22

ISO (International Organization for Standardization)
IEEE (Institute of Electrical and Electronics Engineers)
ANSI (American National Standards Institute)
ITU (International Telecommunication Union)

Question 23

ISO

Answer 23

International Organization for Standardization

Question 24

IEEE

Answer 24

Institute of Electrical and Electronics Engineers

Question 25

ANSI

Answer 25

American National Standards Institute

Question 26

ITU

Answer 26

International Telecommunication Union