Deck 12: Ethernet

Question 1

The IEEE 802.3 standard is known as ________.

A)Ethernet
B)layer 2 switching
C)fibre channel
D)subnetworking

Answer 1

A

Question 2

Ethernet has both a medium access control layer and a physical layer.

Answer 2

True

Question 3

A disadvantage of Ethernet technology is the lack of availability of reliable and interoperable networking products from vendors.

Answer 3

False

Question 4

A problem with ________ is that capacity is wasted because the medium will generally remain idle following the end of a transmission,even if there are one or more stations waiting to transmit.

A)p-persistent CSMA
B)nonpersistent CSMA
C)1-persistent CSMA
D)slotted ALOHA

Question 5

An algorithm is needed with CSMA to specify what a station should do if the medium is found busy.

Question 6

Rapid Ethernet refers to a set of specifications developed by the IEEE 802.3 committee to provide a low-cost,Ethernet-compatible LAN operating at 100 Mbps and utilizing 10BASE-T.

Question 7

A variety of signal encoding techniques are used in the various LAN standards to achieve efficiency and to make the high data rates practical.

Question 8

Client/server computing has become a dominant architecture in the business environment.

Question 9

For 1 Gbps and 10 Gbps operations the CSMA/CD MAC protocol is used.

Question 10

A compromise that attempts to reduce collisions,like nonpersistent,and reduce idle time,like 1-persistent,is p- persistent.

Question 11

The maximum utilization achievable using ALOHA can far exceed that of CSMA.

Question 12

With full-duplex operation a station can transmit and receive simultaneously.

Question 13

Ethernet is now the preferred carrier wire line vehicle for bridging wireless technologies such as WiFi and WiMAX into local Ethernet networks.

Question 14

A technique known as slotted ________ organizes time on the channel into uniform slots whose size equals the frame transmission time.Transmission is permitted to begin only at a slot boundary.

A)ALOHA
B)CSMA
C)boundary relay
D)Ethernet

Question 15

One of the strengths of the Fast Ethernet approach is that it readily supports a mixture of existing 10-Mbps LANs,100-Mbps LANs, and newer 16-Gpbs LANs.

Question 16

With CSMA/CD the amount of wasted capacity is reduced to the time it takes to detect a collision.

Question 17

IEEE802.3b defines the operation of VLAN bridges and switches.

Question 18

Ethernet now encompasses data rates of ________.

A)10 Mbps,100 Mbps,1000 Mbps,and 10 Gbps
B)10 Mbps,100 Mpbs,1 Gbps,and 10 Gbps
C)1 Gpbs,10 Gbps,100 Gbps,and 1000 Gbps
D)100 Mpbs,1 Gbps,10 Gbps,and 100 Gbps

Question 19

The p-persistent algorithm with binary exponential backoff is efficient over a wide range of loads.

Question 20

Two frames interfering with each other at the receiver so that neither gets through is known as ________.

A)a collision
B)a backlog
C)a backoff
D)scrambling

Question 21

One of the rules for CSMA/CD states,"after transmitting the jamming signal,wait a random amount of time,then attempt to transmit again".This random amount of time is referred to as the ________.

A)precursor
B)backlog
C)carrier time
D)backoff

Question 22

Which of the following makes use of two optical fiber cables,one for transmission and one for reception,and utilizes a technique known as intensity modulation.

A)10BASE-T
B)100BASE-FX
C)100BASE-T4
D)10BASE-F

Question 23

The IEEE 802.3 standard allows a maximum of ________ repeaters between any two stations with the 10BASE5 alternative.

A)two
B)four
C)three
D)five

Question 24

The CSMA/CD algorithm used in the IEEE 802.3 standard is ________.

A)ALOHA
B)nonpersistent
C)1-persistent
D)p-persistent

Question 25

A set of options that use two physical links between nodes,one for transmission and one for reception,is ________.

A)100BASE-X
B)100BASE-T
C)100BASE-FX
D)100BASE-TX

Question 26

In the 802.3 frame format,a 7-octet pattern of alternating 0s and 1s used by the receiver to establish bit synchronization is the ________.

Question 27

By assigning the same ________ to end systems on many switches,one or more VLAN broadcast domains can be extended across a large network.

Question 28

The principle driving requirement for ________ is the increase in Internet and intranet traffic.

A)10 Gigabit Ethernet
B)100BASE-LX
C)10BASE-T
D)10BASE-5

Question 29

For the lower data rates the ________ MAC protocol is used.

Question 30

If the medium is idle,transmit,otherwise,if the medium is busy,continue to listen until the channel is sensed idle,then transmit immediately,are the rules of ________ carrier sense multiple access.

Question 31

With ________,a station wishing to transmit first listens to the medium to determine if another transmission is in progress.If the medium is in use,the station must wait.If the medium is idle,the station may transmit.

A)ALOHA
B)transmission backlog delay
C)Ethernet
D)CSMA

Question 32

A ________ is a collection of interconnected access points with a software protocol structure that enables communication.

A)network
B)I/O channel
C)carrier access station
D)Fibre channel

Question 33

The IEEE standard restricts the maximum length of coaxial cable to 500 m for 10BASE5 and 200 m for ________.

Question 34

To ensure that backoff maintains stability,IEEE 802.3 and Ethernet use a technique known as ________ backoff.

Question 35

A VLAN ________.

A)must not indicate VLAN membership
B)is also referred to as a TCI
C)can span multiple interconnected switches
D)is limited to one switch

Question 36

________ consists of three subfields: user priority,canonical format indicator and VLAN identifier.

Question 37

The most widely used high speed LANs today are based on ________ and were developed by the IEEE 802.3 standards committee.

Question 38

IEEE 802.3ba specifies three types of transmission media: copper backplane, twisted pair and ________.

Question 39

The earliest medium access control technique is known as ________ and was developed for packet radio networks.

Question 40

The sequence 10101011 is the ________ and indicates the actual start of the frame and enables the receiver to locate the first bit of the rest of the frame.

A)start frame delimiter
B)frame check sequence
C)preamble
D)LLC data

Question 41

Because it does not transmit a continuous signal between packets,making it useful in battery-powered applications,________ is designed to produce a 100- Mbps data rate over lower quality Category 3 cable.

Question 42

The ________ alternative uses unshielded twisted pair in a star shaped topology.The length of a link is limited to 100 meters,unless an optical fiber link is used, then the maximum length is 500 m.

Question 43

An ________ is a direct point-to-point or multipoint communications link, predominantly hardware based and designed for high speed over very short distances.It transfers data between a buffer at the source device and a buffer at the destination device,moving only the user contents from one device to another without regard to the format or meaning of the data.

Question 44

A ________ is an administratively configured broadcast domain consisting of a subset of end stations attached to a LAN.

Question 45

For shared medium hub operation there are two enhancements to the basic CSMA/CD scheme: carrier extension and ________.