Deck 5: Ethernet 8023switched Lans

Question 1

Which working group is likely to develop security standards to be used by multiple LAN/WAN technologies?

A)802.1
B)802.e
C)802.3
D)802.11

Answer 1

A

Question 2

In binary signaling there is (are)________ state(s).

A)one
B)two
C)a number of
D)an infinite number of

Answer 2

B

Question 3

Ethernet standards are specified at the ________ layer.

A)physical
B)data link
C)both A and B
D)neither A nor B

Answer 3

C

Question 4

Which of the following is relatively immune to small errors?

A)analog signaling
B)binary signaling
C)both A and B
D)neither A nor B

Question 5

What type of switch connects users to the network?

A)user switches
B)core switches
C)access switches
D)workgroup switches

Question 6

In LANs,________ typically is for ________.

A)optical fiber, access lines
B)UTP, access lines
C)UTP, trunk lines
D)none of the above

Question 7

In LANs,optical fiber typically is used in ________.

A)trunk lines
B)access lines
C)workgroup switches
D)core switches

Question 8

In digital signaling there is (are)________ state(s).

A)one
B)two
C)a small number of
D)an infinite number of

Question 9

A local area network operates ________.

A)on a customer premises
B)between customer premises
C)both A and B
D)neither A nor B

Question 10

What 802 Working Group creates Ethernet standards?

A)802.1
B)802.2
C)802.3
D)802.11

Question 11

Physical layer standards govern ________.

A)frame structure
B)signaling
C)both A and B
D)neither A nor B

Question 12

Ethernet standards are specified at the ________ layer.

A)Internet
B)transport
C)both A and B
D)neither A nor B

Question 13

What organization creates Ethernet standards? (Give the most specific answer.)

A)IEEE
B)IETF
C)ISO
D)OSI

Question 14

Ethernet has only a single standard at the ________ layer.

A)physical
B)MAC
C)data link
D)Internet

Question 15

What form of transmission is most resistant to transmission errors?

A)digital
B)analog
C)Both are about equally resistant to transmission errors.
D)none of the above

Question 16

In this book,we use the terms Ethernet and 802.3 interchangeably.

Question 17

Optical fiber's main advantage over UTP is ________.

A)lower cost
B)lower fragility
C)higher speed
D)greater distance span

Question 18

What type of copper wiring is widely used in Ethernet?

A)optical fiber
B)4-pair UTP
C)both A and B
D)neither A nor B

Question 19

What type of switch connects switches to other switches?

A)trunk switches
B)core switches
C)workgroup switches
D)none of the above

Question 20

Ethernet standards are specified at the ________ layer.

A)physical
B)internet
C)both A and B
D)neither A nor B

Question 21

The ability to transmit in two directions simultaneously is ________.

A)parallel communication
B)full-duplex communication
C)both A and B
D)neither A nor B

Question 22

Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second?

A)category 6
B)category 6A
C)both A and B
D)neither A nor B

Question 23

Which of the following is used most heavily in LANs for fiber transmission links?

A)modal bandwidth fiber
B)1)550 nm fiber
C)single-mode fiber
D)multimode fiber

Question 24

CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________.

A)10 Mbps
B)100 Mbps
C)1 Gbps
D)10 Gbps

Question 25

Four-pair UTP uses ________ connectors.

A)universal
B)binary
C)ST or SC
D)none of the above

Question 26

Which light wavelength dominates in LANs?

A)850 nm
B)1,310 nm
C)1,550 nm
D)1 Gbps

Question 27

Which UTP quality levels can send signals at 10 gigabits per second?

A)category 6
B)category 6A
C)both A and B
D)neither A nor B

Question 28

When the light energies of two pulses arrive at overlapping times,this is ________.

A)multimode transmission
B)modal bandwidth
C)modal dispersion
D)modal interference

Question 29

________ fiber is being sold today.

A)OM2
B)OM4
C)both A and B
D)neither A nor B

Question 30

Modal dispersion limits transmission distance in ________.

A)multimode fiber
B)single-mode fiber
C)both A and B
D)neither A nor B

Question 31

In optical fiber,light travels through the ________.

A)core
B)cladding
C)both A and B

Question 32

Untwisting wire pairs no more than 1.25 cm (a half inch)at their ends reduces ________.

A)interference
B)crosstalk interference
C)terminal crosstalk interference
D)none of the above

Question 33

How many wires are there is a UTP Ethernet cord?

A)1
B)2
C)4
D)8

Question 34

Fiber that has a core diameter of 8 microns is ________.

A)multimode fiber
B)single-mode fiber
C)full duplex fiber
D)exceptionally fast

Question 35

UTP categories rate the ________ of UTP cabling.

A)quality
B)speed
C)quality-of-service performance
D)error performance

Question 36

The distance between two corresponding points in adjacent cycles is the ________.

A)frequency
B)wavelength
C)bandwidth
D)span

Question 37

4-pair UTP terminates in a(n)________ connector.

A)USB
B)RJ-45
C)SC
D)standard telephone

Question 38

The longest transmission distances are possible with ________.

A)USB
B)UTP
C)single-mode fiber
D)multimode fiber

Question 39

The main benefit of parallel transmission over serial transmission is ________.

A)reliability
B)speed
C)both A and B
D)neither A nor B

Question 40

Optical fiber cords use two strands ________.

A)for reliability through redundancy
B)to form a complete electrical loop
C)to double the transmission speed
D)for full-duplex transmission

Question 41

Ethernet can offer ________ priority levels.

A)up to 2
B)up to 4
C)up to 8
D)Ethernet cannot offer priority levels.

Question 42

The Ethernet data field contains ________.

A)a packet
B)the LLC subheader
C)both A and B
D)neither A nor B

Question 43

The purpose of LLC subheader is to ________.

A)permit error detection
B)divide the data field from the trailer
C)divide the header from the data field
D)designate the type of packet in the data field

Question 44

Ethernet becomes the dominant of LAN technology primarily because of its ________.

A)high speed, compared with competing technologies
B)use of multiple switches
C)low cost, compared with competing technologies
D)sophistication, compared with competing technologies

Question 45

If an Ethernet receiver detects an error in an arriving frame,it ________.

A)drops the frame
B)sends an ACK to the sender
C)sends a NACK to the receiver
D)sends the sender a retransmission request frame

Question 46

In a ________ topology,there is only one possible path between any two hosts.

A)mesh
B)hierarchical
C)both A and B
D)neither A nor B

Question 47

Creating effective backup links in RSTP is ________.

A)completely automatic
B)simple and largely automatic
C)difficult and time consuming
D)impossible

Question 48

Ethernet is inexpensive thanks to ________.

A)its hierarchical topology
B)its use of multiple switches
C)its use of regeneration
D)its use of the Rapid Spanning Tree Protocol

Question 49

Which of the following can increase reliability considerably in an Ethernet LAN?

A)using a hierarchical topology
B)using a mesh topology
C)using a bus topology
D)using the Rapid Spanning Tree Protocol

Question 50

Link aggregation can increase trunk speed by a factor of ________.

A)two
B)three
C)both A and B
D)neither A nor B

Question 51

Ethernet's hierarchical topology tends to create ________.

A)greater reliability
B)lower cost per frame handled
C)both A and B
D)none of the above

Question 52

An Ethernet switch knows ________.

A)an IP address for each EUI-48 address
B)a single port number for each EUI-48 address
C)multiple port numbers for each EUI-48 address
D)the entire path from the source host to the destination host

Question 53

Ethernet usually has a 100 meter distance limit for ________.

A)physical links
B)data links
C)routes
D)both A and B

Question 54

The Ethernet length field gives the length of the ________.

A)frame
B)frame, less the frame check field's size
C)data field
D)data field plus PAD

Question 55

Using priority in Ethernet requires the use of ________ fields.

A)QoS
B)flag
C)extension
D)tag

Question 56

Ethernet's hierarchical topology makes it ________.

A)expensive
B)reliable
C)both A and B
D)neither A nor B

Question 57

Ethernet addresses were formerly called ________ addresses.

A)MAC
B)EUI-48
C)both A and B
D)neither A nor B

Question 58

Switches in an Ethernet LAN are organized in a ________ topology.

A)mesh
B)hierarchical
C)point-to-point
D)bus

Question 59

At what layer is the 100BASE-TX standard?

A)physical
B)data link
C)Internet
D)physical and data link

Question 60

The official name for Ethernet addresses is the ________ addresses.

A)MAC
B)EUI-48
C)both A and B
D)neither A nor B

Question 61

A man in the middle attack ________.

A)reads traffic traveling between one host to another
B)creates a denial service attack on both parties
C)creates a denial of service attack against the client
D)none of the above

Question 62

The ________ standard was created to prevent attackers from walking in and simply plugging a computer into a wall jack and therefore accessing the network.

A)Ethernet firewall
B)802.1AE
C)802.3X
D)802.1X

Question 63

What is the maximum power for POE Plus in the standard?

A)15 watts
B)25 watts
C)75 watts
D)150 watts

Question 64

Managed Ethernet switches ________.

A)are not standardized
B)are managed by an outsourcing company
C)reduce hardware costs
D)reduce labor costs

Question 65

Which of the following is a benefit of using a central authentication server?

A)consistency in authentication
B)faster changes when authentication information needs to be changed
C)both A and B
D)neither A nor B

Question 66

Under the standard,Ethernet switches can provide enough power over UTP for ________.

A)wireless access points
B)desktop computers
C)both A and B
D)neither A nor B

Question 67

Under the standard,Ethernet switches can provide enough power over UTP for ________.

A)wireless access points
B)voice over IP telephones
C)both A and B
D)neither A nor B

Question 68

In 802.1X,the workgroup switch is the ________.

A)authentication server
B)authenticator
C)both A and B
D)neither A nor B

Question 69

Strong security is needed to ________.

A)collect information from remote switches
B)reconfigure remote switches
C)have a MIB
D)reduce total costs

Question 70

ARP cache poisoning can be defeated using ________.

A)802.1X
B)802.3 Lock
C)802.1AE
D)802.2