Chapter 6: Data Link Layer

Which of the following are data link layer protocols?

802.11 Ethernet Point-to-point(PPP) HIgh-level data link control(HDLC) Frame-relay

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

Accepts a frame from a medium, de-encapsulates the frame, & re-encapsulates the packet into a new frame

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

CSMA/CA

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

CSMA/CD

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

IEEE

Which engineering organizations define open standards and protocols that apply to the data link layer?

Institute for Electrical and Electronic Engineers (IEEE). International Telecommunications Union (ITU). International Organizations for Standardization (ISO). •American National Standards Institute (ANSI).

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

LLC MAC

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

Logical Link Control & Media Access Control

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

MAC address

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

MAC address

What is the responsibility of the MAC sublayer?

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

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

WAN

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

carrier sense multiple access/collision detection

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

data link

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

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

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

Which LAN topology is a hybrid topology?

extended star

Which duplex communication method is used in WLANs?

half-duplex

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

header & trailer

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

it accepts layer 3 packets and encapsulates them into frames it provides media access control and performs error detection

What is another name for the OSI data link layer?

layer 2

Which topology displays networking device layer IP addresses?

logical topolgy

What is true concerning physical and logical topologies?

logical typologies refer to how a network transfers data between devices

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

media sharing & topoly

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?

mesh

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

star

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

the use of full-duplex capable Layer 2 switches

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

to determine whether the frame experienced transmission errors

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

to identify which network layer protocol is being used