Deck 3: Data Link Layer

Question 1

All of the following are advantages of using broadcasting to send data except _____.

A)it is simple
B)it is inexpensive
C)it can be used for networks of any size
D)it does not require any controllers to regulate who can transmit data

Answer 1

C

Question 2

In Ethernet,CSMA/ CD refers to _____.

A)Carrier Sense multiple access with collision detection
B)Carrier Sense multiple access with collision deference
C)Collision Sense for multiple access computers and devices
D)Carriers Sense for multiple access computers and devices

Answer 2

A

Question 3

When the data link layer detects errors in incoming data,it typically _____.

A)attempts to fix the error
B)accepts the data anyway
C)accepts the data,but marks it so that upper layers can fix the error
D)deletes the data

Answer 3

D

Question 4

In computer networking,medium access control is the method used to determine _____.

A)who can enter the office
B)who can send data over a shared medium
C)who can determine the data rate of the physical medium
D)who can mediate a dispute between two or more end users

Question 5

Echo is not a useful error detection techniques in computer networking because _____.

A)it is complex to use
B)it is difficult to implement
C)it is time consuming
D)errors may cancel out during the echo

Question 6

A technology that uses broadcasting to transmit data sends the data to _____.

A)all computers on the Internet
B)only the intended destination of the data
C)all stations on the network
D)None of the above

Question 7

The functions of the data link layer include _____.

A)routing
B)local addressing and error-detection
C)segmentation and re-assembly of data
D)link data networks

Question 8

The data link is responsible for sending data between _____.

A)devices on a single network
B)devices on neighboring networks
C)devices anywhere on the Internet
D)None of the above

Question 9

CRC is an error-detecting algorithm that checks data integrity by _____.

A)using redundant information
B)computing a polynomial algorithm based checksum
C)using echo
D)discarding data

Question 10

If the data is 101011 and the divisor is 1011,the CRC remainder is _____.

A)110
B)101
C)001
D)010

Question 11

A disadvantage of using broadcasting to transmit data is that _____.

A)it is inexpensive
B)it is simple
C)most users who receive the data have no use for the data
D)it leads to too many errors

Question 12

In computer networking,a collision is a situation where _____.

A)an end user collides with his workstation
B)two or more end users collide with each other at the water cooler
C)two or more end users get into an argument over who has access to the network
D)two or more demands are placed on a network that can only handle one demand at a time

Question 13

The Ethernet address MAC address)has _____ bits.

A)32
B)64
C)48
D)16

Question 14

A network using Ethernet can be up to ______ in radius.

A)1,000 meters
B)100 meters
C)10 miles
D)indefinite

Question 15

If the data is 111011 and the divisor is 1101,the CRC remainder is _____.

A)110
B)101
C)111
D)010

Question 16

In computer networking,carrier sensing refers to _____.

A)monitoring the medium to detect whether another station is transmitting data
B)monitoring network carriers ex.AT&T,Comcast etc)to ensure quality of service
C)sensing the network load of the network carriers ex.AT&T,Comcast etc)
D)None of the above

Question 17

When the data link layer deletes incoming frames,the lost frames are recovered by _____.

A)the network layer
B)the transport layer
C)the application layer
D)the physical layer

Question 18

All of the following are examples of using broadcasting to transmit data except _____.

A)satellite radio transmission
B)college classroom
C)spam email
D)junk mail
E)a letter in the mail addressed to a friend

Question 19

The most common data link layer technology used in corporate networks is _____.

A)TCP
B)Internet
C)Ethernet
D)IP

Question 20

The receiver of a data packet determines that the packet was sent to it by looking at _____.

A)the destination address of the packet
B)the source address of the packet
C)the frame check sequence field
D)The start of frame delimiter

Question 21

One character in the hexadecimal notation represents _______ bits.

A)2
B)4
C)6
D)8

Question 22

Most modern corporate Ethernets use switches instead of hubs.

Question 23

The first 24 bits of a MAC address identify the _____.

A)manufacturer of the network card
B)computer on the network
C)owner of the computer network
D)owner of the IP address

Question 24

Switches discover the MAC addresses of computers connected on the different ports by looking at the _____.

A)source address of outgoing packets
B)destination address of outgoing packets
C)destination address of incoming packets
D)source address of incoming packets

Question 25

Switches improve the efficiency of Ethernets by _____.

A)reducing errors
B)speeding transmission rates
C)reducing collisions
D)improving signals