Deck 13: Ethernet, switches, and Virtual Lans

Question 1

Which of the following is not one of the speeds found in a modern Ethernet LAN?

A)10 Mbps
B)100 Mbps
C)100 Gbps
D)10 Gbps

Answer 1

C

Question 2

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

A)FCS
B)SFD
C)DA
D)SA

Answer 2

B

Question 3

PoE makes it possible to distribute both power and data using Ethernet cabling.

Answer 3

True

Question 4

Two general approaches to connecting multiple LANs are bridges and switches.

Question 5

A broadcast recipient address means that all devices connected to the LAN are to receive the message.

Question 6

A layer 3 switch is just another name for a router.

Question 7

A MAC frame includes various bit patterns to enable a receiver to correctly recognize key parts of the information contained in the frame.

Question 8

Which of the following LAN technologies has the highest capacity?

A)Ethernet
B)Fast Ethernet
C)Fibre Channel
D)Gigabit Ethernet

Question 9

Because of increased functionality of modern layer 2 switches, bridges have been replaced by these types of switches.

Question 10

VLANs provide the ability for any organization to be physically dispersed throughout the company while maintaining its group identity.

Question 11

One simple approach to improving efficiency is to physically partition the LAN into separate broadcast domains.

Question 12

The frame format for the 802.3 protocol consists of:

A)preamble
B)SFD
C)destination address
D)all of the above

Question 13

A seven-octet pattern of alternating 0s and 1s used by the receiver to establish bit synchronization is a ________.

A)source address
B)start frame delimiter
C)preamble
D)destination address

Question 14

On a bus topology LAN,each station can send and receive data to or from another station independent of other bus activity.

Question 15

Network topology refers to the way individual end stations access the network prior to transmission of user data.

Question 16

The original commercial Ethernet,as well as the original IEEE 802.3 standard,operated at 100 Mps.

Question 17

In the MAC frame,the start of frame delimited (SFD)provides the receiver with the starting point of meaningful data in the frame.

Question 18

Every MAC frame must include two addresses,which allows an alternative receiver to be designated in the event an error occurs.

Question 19

The strength of Ethernet lies in its backward compatibility, industry support,and simplicity.

Question 20

In general,the performance of a LAN declines with increased lengths of connections and / or the number of devices using it.

Question 21

A _________ is an alternative to the bus topology,connects with a transmit and receive line,and acts as a repeater.

Question 22

___________ provides a low-cost,easily scalable approach to achieving very high data rates and is used in storage area networks (SANs)and for other types of storage networking.

Question 23

Routing takes place at the ___________ layer.

A)network
B)link
C)data control
D)physical

Question 24

The __________ is a 32-bit cyclic redundancy check (CRC), based on all fields except preamble,SFD,and FCS.

A)FCS
B)extension
C)SFD
D)none of the above

Question 25

The __________ is a data unit supplied by LLC.The maximum size of this field is 1500 octets for a basic frame,1504 octets for a Q-tagged frame,and 1982 octets for an envelope frame.

Question 26

This option supports 1-Gbps links among devices located within a single room or equipment rack,using copper jumpers (specialized STP cable that spans no more than 25 m).Each link is composed of a separate STP running in each direction.

A)1000BASE-SX
B)1000BASE-T
C)1000BASE-LX
D)1000BASE-CX

Question 27

A _________ is octets added to ensure that the frame is long enough for proper CD operation.

Question 28

Segmenting a larger network into ___________ domains can help to prevent a fault in one network segment from affecting the entire network.

Question 29

The _________ specifies the station that sent the frame.

A)MAC client data
B)SFD
C)SA
D)FCS

Question 30

In general,performance on a LAN _________ with an increase in the number of devices or the length of the wire.

A)increases
B)decreases
C)fluctuates
D)does not change

Question 31

The most widely used high-speed LANs in today's enterprise networks are referred to as _________ and were developed by the IEEE 802.3 standards committee.

Question 32

This short-wavelength option supports duplex links of up to 275 m using 62.5-μm multimode or up to 550 m using 50-μm multimode fiber.Wavelengths are in the range of 770-860 nm.

A)1000BASE-SX
B)1000BASE-T
C)1000BASE-LX
D)1000BASE-CX

Question 33

A _________ provides a means of interconnecting similar LANs.

Question 34

A hub uses a ________ wiring arrangement to attach stations to the hub.

Question 35

In a _________ LAN,all stations attach,through appropriate hardware interfacing known as a tap,directly to a linear transmission medium,or bus.

Question 36

_________ makes it possible to distribute both power and data using Ethernet cabling.

A)VLAN
B)PoE
C)MAC
D)CSMA

Question 37

It may happen that two or more stations attempt to transmit at about the same time; if this happens,there will be a _________ .

Question 38

This option makes use of four pairs of Category 5 UTP to support devices over a range of up to 100 m.

A)1000BASE-SX
B)1000BASE-T
C)1000BASE-LX
D)1000BASE-CX

Question 39

The _________ specifies the station(s)for which the frame is intended.It may be a unique physical address,a group address,or a broadcast address.

A)DA
B)SA
C)SFD
D)preamble

Question 40

This long-wavelength option supports duplex links of up to 550 m of 62.5-μm or 50-μm multimode fiber or up to 5 km of 10-μm single mode fiber.Wavelengths are in the range of 1270-1355 nm.

A)1000BASE-SX
B)1000BASE-T
C)1000BASE-LX
D)1000BASE-CX

Question 41

A _________ is a logical subgroup within a LAN that is created by software rather than by physically moving and separating devices.

Question 42

___________ 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.

Question 43

Two major types of layer 2 switches are available for use in business networks: store-and-forward switch and ____________.

Question 44

The total collection of devices that receive broadcast frames from each other is referred to as a broadcast _________ .

Question 45

A malfunctioning device can create a _________ ,in which numerous broadcast frames clog the network and crowd out legitimate traffic.