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Networking Revamped > Module 6 - Data Link Layer > Flashcards

Module 6 - Data Link Layer Flashcards

1
Q

What is another name for the OSI data link layer?

Layer 1
Layer 2
Layer 3
Layer 6

A

Layer 2

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2
Q

The IEEE 802 LAN/MAN data link layer consists of which two sublayers? (Choose two.)

Network Control Protocol
Logical Link Control
Media Access Control
Link Control Protocol

A
  • Logical Link Control
  • Media Access Control
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3
Q

The media access control method used depends on which two criteria?

Layer 3 IP protocol
Media sharing
Topology
Transport layer protocol
Type of data

A
  • Media sharing
  • Topology
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3
Q

What is the responsibility of the MAC sublayer?

Adds Layer 3 addresses to the frame
Communicates with the network layer (Layer 3)
Provides the method to get the frame on and off the media
Transmits the bits on the media

A

Provides the method to get the frame on and off the media

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3
Q

Which organization defines standards for the network access layer (i.e., the OSI physical and data link layers)?

Cisco
IANA
IEEE
IETF

A

IEEE

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4
Q

What Layer 2 function does a router perform? (Choose three.)

Accepts a frame from a medium
De-encapsulates the frame
Refers to its Layer 3 routing table for a matching destination network
Re-encapsulates the packet into a new frame

A
  • Accepts a frame from a medium
  • De-encapsulates the frame
  • Re-encapsulates the packet into a new frame
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5
Q

Which topology displays networking device layer IP addresses?

aerial topology
IP address topology
logical topology
physical topology

A

logical topology

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5
Q

What kind of network would use point-to-point, hub and spoke, or mesh topologies?

PAN
LAN
WLAN
WAN

A

WAN

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6
Q

Which LAN topology is a hybrid topology?

bus
extended star
ring
star

A

extended star

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6
Q

Which duplex communication method is used in WLANs?

full-duplex
half-duplex
simplex

A

half-duplex

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6
Q

Which media access control method is used in legacy Ethernet LANs?

carrier sense multiple access/collision annoyance
carrier sense multiple access/collision avoidance
carrier sense multiple access/collision destruction
carrier sense multiple access/collision detection

A

carrier sense multiple access/collision detection

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7
Q

What does the data link layer add to a Layer 3 packet to create a frame? (Choose two.)

flags
sequence number
header
trailer

A
  • header
  • trailer
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8
Q

What is the function of the last field in a data link layer frame?

To determine whether the frame experienced transmission errors
To identify special flow control services such as quality of service (QoS)
To identify the beginning and end limits of the frame
To identify the Layer 3 protocol in the data field

A

To determine whether the frame experienced transmission errors

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9
Q

Which lists the Layer 2 and Layer 3 address fields in the correct order?

destination NIC address, source NIC address, source IP address, destination IP address
source NIC address, destination NIC address, source IP address, destination IP address
destination NIC address, source NIC address, destination IP address, source IP address
source NIC address, destination NIC address, destination IP address, source IP address

A

destination NIC address, source NIC address, source IP address, destination IP address

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10
Q

Which of the following are data link layer protocols? (Choose three)

802.11
Ethernet
IP
PPP
UDP

A
  • 802.11
  • Ethernet
  • PPP
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11
Q

What are two services performed by the data link layer of the OSI model? (Choose two.)

It encrypts data packets.
It determines the path to forward packets.
It accepts Layer 3 packets and encapsulates them into frames.
It provides media access control and performs error detection.
It monitors the Layer 2 communication by building a MAC address table.

A
  • It accepts Layer 3 packets and encapsulates them into frames.
  • It provides media access control and performs error detection.
12
Q

What does a router do after de-encapsulating a received frame?

determines the best path
de-encapsulates the frame
re-encapsulates the packet into a new frame
forwards the new frame onto the network medium

A

determines the best path

13
Q

What type of physical topology can be created by connecting all Ethernet cables to a central device?

bus
ring
star
mesh

A

star

13
Q

What attribute of a NIC would place it at the data link layer of the OSI model?

attached Ethernet cable
IP address
MAC address
RJ-45 port
TCP/IP protocol stack

A

MAC address

13
Q

Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?

the virtually unlimited availability of IPv6 addresses
the use of CSMA/CA
the use of full-duplex capable Layer 2 switches
the development of half-duplex switch operation
the use of Gigabit Ethernet speeds

A

the use of full-duplex capable Layer 2 switches

14
Q

A technician has been asked to develop a physical topology for a network that provides a high level of redundancy. Which physical topology requires that every node is attached to every other node on the network?

bus
hierarchical
mesh
ring
star

A

mesh

15
Q

Which is a function of the Logical Link Control (LLC) sublayer?

to define the media access processes that are performed by the hardware
to provide data link layer addressing
to identify which network layer protocol is being used
to accept segments and package them into data units that are called packets

A

to identify which network layer protocol is being used

15
Q

Which statement describes the half-duplex mode of data transmission?

Data that is transmitted over the network can only flow in one direction.
Data that is transmitted over the network flows in one direction at a time.
Data that is transmitted over the network flows in one direction to many different destinations simultaneously.
Data that is transmitted over the network flows in both directions at the same time.

A

Data that is transmitted over the network flows in one direction at a time.

16
Q

Which data link layer media access control method does Ethernet use?

CSMA/CD
determinism
turn taking
token passing

A

CSMA/CD

17
Q

What are the two sublayers of the OSI model data link layer? (Choose two.)

internet
physical
LLC
transport
MAC
network access

A
  • LLC
  • MAC
18
Q

What method is used to manage contention-based access on a wireless network?

CSMA/CD
priority ordering
CSMA/CA
token passing

A

CSMA/CA

19
Q

What identifier is used at the data link layer to uniquely identify an Ethernet device?

IP address
MAC address
sequence number
TCP port number
UDP port number

A

MAC address

20
Q

Which two engineering organizations define open standards and protocols that apply to the data link layer? (Choose two.)

International Organization for Standardization (ISO)
Internet Assigned Numbers Authority (IANA)
International Telecommunication Union (ITU)
Electronic Industries Alliance (EIA)
Internet Society (ISOC)

A
  • International Organization for Standardization (ISO)
  • International Telecommunication Union (ITU)
21
Q

Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

application
transport
data link
physical

A

data link

22
Q

What is true concerning physical and logical topologies?

The logical topology is always the same as the physical topology.
Physical topologies are concerned with how a network transfers frames.
Physical topologies display the IP addressing scheme of each network.
Logical topologies refer to how a network transfers data between devices.

A

Logical topologies refer to how a network transfers data between devices.

Networking Revamped (15 decks)

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