Deck 6: Switched Wired Networks

Question 1

Which of the following will be a speed for the next generation of Ethernet speeds?

A)40 Gbps.
B)100 Gbps.
C)Both A and B

Answer 1

C

Question 2

Baseband transmission dominates in LANs because it is ________ than broadband transmission.

A)faster
B)less expensive
C)Both A and B
D)Neither A nor B

Answer 2

B

Question 3

The 802.3 100BASE-TX standard is defined at the ________ layer.

A)physical
B)data link
C)Both A and B
D)Neither A nor B

Answer 3

A

Question 4

What 802 Working Group creates Ethernet standards?

A)802.1.
B)802.2.
C)802.3.
D)802.5.
E)802.11.

Question 5

The most widely used Ethernet standard for connecting hosts to switches is ________.

A)100BASE-TX
B)1000BASE-SX
C)Both A and B
D)Neither A nor B

Question 6

The most widely used Ethernet standard for connecting switches to other switches is ________.

A)100BASE-TX
B)1000BASE-LX
C)Both A and B
D)Neither A nor B

Question 7

Ethernet standards are ________.

A)OSI standards
B)TCP/IP standards
C)Both A and B
D)Neither A nor B

Question 8

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

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

Question 9

The 1000BASE-T standard has a maximum distance of 100 meters.When UTP is used,this is the maximum distance span of an Ethernet network.

Question 10

At what layer is the 100BASE-TX standard?

A)Physical.
B)Data link.
C)Internet.
D)All of the above.
E)Physical and data link only.

Question 11

What 802 Working Group creates security standards?

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

Question 12

Ethernet and 802.3 are used interchangeably in this book.

Question 13

LANs that span distances of several kilometers by using multimode fiber are made possible by ________.

A)multimode optical fiber
B)high modal dispersion
C)high modal bandwidth
D)regeneration

Question 14

The use of two or more trunk lines between a pair of switches is ________.

A)possible through link aggregation
B)impossible because it would create a loop

Question 15

Using link aggregation with two or three trunk lines ________ going to a single faster Ethernet port.

A)is less expensive than
B)is just as fast as
C)Both A and B
D)Neither A nor B

Question 16

Ethernet became dominant because ________.

A)it is the least expensive LAN technology
B)it is the most sophisticated LAN technology
C)Both A and B

Question 17

802.2 is the Working Group that creates Ethernet standards.

Question 18

The dominant switched LAN technology today is Ethernet.

Question 19

In broadband transmission,signals are injected directly into a high-speed transmission medium.

Question 20

If both 1000BASE-LX and 1000BASE-SX will serve your needs,which one should you use?

A)1000BASE-LX.
B)1000BASE-SX.
C)Either,because both run at the same speed.

Question 21

If there is a PAD field,it will be added by the receiver.

Question 22

Which of the following is a layer within the data link layer?

A)LLC layer.
B)MAC layer.
C)Both A and B
D)Neither A nor B

Question 23

B2-CC-66-0D-5E is a valid MAC address.

Question 24

An Ethernet data field is 100 octets long.How long will the PAD be?

A)There will not be a PAD.
B)46 octets.
C)1,400 octets.
D)1,500 octets.

Question 25

In Ethernet,synchronization is provided by the ________.

A)preamble field
B)frame check sequence field
C)Both A and B

Question 26

Ethernet has multiple ________.

A)physical layer standards
B)MAC layer standards
C)Both A and B
D)Neither A nor B

Question 27

The Ethernet LLC subheader normally contains an IP packet.

Question 28

The Ethernet data field contains ________.

A)a packet
B)the LLC subheader
C)Both A and B

Question 29

The minimum length of an Ethernet data field is 46 octets.

Question 30

The maximum length of the Ethernet data field is ________ octets.

A)46
B)100
C)1,000
D)10,000
E)None of the above.

Question 31

An Ethernet data field is 40 octets long.How long will the PAD be?

A)There will not be a PAD.
B)6 octets.
C)46 octets.
D)1460 octets.
E)1500 octets.

Question 32

Ethernet addresses are called MAC addresses.

Question 33

H2-BC-66-0D-5E-BA is a valid MAC address.

Question 34

A purpose of the LLC subheader is to describe the type of packet contained in the data field.

Question 35

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
E)address field

Question 36

B2-CC-66-0D-5E-BA is a valid MAC address.

Question 37

Ethernet MAC layer addresses are also called physical addresses.

Question 38

Which data link layer in 802 standards defines specific functionality for a particular LAN technology?

A)LLC.
B)MAC.
C)Both A and B
D)Neither A nor B

Question 39

Ethernet addresses are called ________ addresses.

A)MAC
B)physical
C)Both A and B
D)Neither A nor B

Question 40

Ethernet receivers detect errors by using the value in the ________ field.

A)PAD
B)preamble
C)data
D)frame check sequence
E)error

Question 41

Ethernet's hierarchical topology makes it ________.

A)expensive
B)reliable
C)Both A and B
D)Neither A nor B

Question 42

A VLAN ID would be found in a ________ field.

A)Tag Protocol ID
B)Tag Control Information
C)Logical Link Control Subheader
D)Broadcast

Question 43

Managed switches ________.

A)increase overall costs
B)decrease overall costs
C)have no impact on overall costs

Question 44

Ethernet became the dominant LAN technology 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
E)All of the above.

Question 45

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

A)mesh
B)hierarchy
C)point-to-point
D)loop
E)bus

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

Ethernet is inexpensive thanks to ________.

A)its hierarchical topology
B)its use of multiple switches
C)its use of regeneration
D)its use of RSTP
E)All of the above.

Question 48

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 49

Which of the following usually has higher port speeds?

A)Workgroup switches.
B)Core switches.
C)Both A and B
D)Neither A nor B

Question 50

Creating effective backup links in RSTP is ________.

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

Question 51

A routers must spend more time deciding how to forward a packet than a switch must spend to forward a frame.

Question 52

VLANs address the problem of ________.

A)congestion
B)reliability
C)convergence
D)loops

Question 53

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

A)Using a hierarchical topology.
B)Using a mesh topology.
C)Using a ring topology.
D)Using the Rapid Spanning Tree Protocol.

Question 54

________ connect hosts to the network.

A)Core switches
B)Workgroup switches
C)Both A and B

Question 55

In an Ethernet LAN,switches know the entire data link between the source and destination host.

Question 56

An Ethernet switch knows ________.

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

Question 57

VLANs can be used to provide security.

Question 58

Hosts in a VLAN can only communicate with each other.

Question 59

________ connect switches to other switches.

A)Core switches
B)Workgroup switches
C)Both A and B

Question 60

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 61

A leased line runs at a speed of 256 kbps.This probably is a ________ line.

A)64x4 kbps bonded
B)T1
C)T3
D)fractional T1
E)fractional T3

Question 62

E1 leased lines run at a speed of about ________.

A)10 kbps
B)50 kbps
C)750 kbps
D)2 Mbps
E)34 Mbps

Question 63

Which of the following are more widely used?

A)T1 lines.
B)SONET lines.
C)Both are used about equally.

Question 64

LANs can be ________

A)switched networks
B)routed networks
C)Either A or B

Question 65

A company has more choices with LANs than WANs.

Question 66

Which of the following is a fractional T1 line speed?

A)128 kbps.
B)1.544 Mbps.
C)Both A and B
D)Neither A nor B

Question 67

Because of greater transmission distances,WAN transmission speeds are ________ LAN transmission speeds.

A)faster than
B)about the same as
C)slower than

Question 68

What is the maximum power for POE?

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

Question 69

In telecommunications,carrier prices are tightly tied to costs.

Question 70

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)STP
B)802.1AE
C)POE
D)802.1X
E)None of the above.

Question 71

Which of the following is a main purpose of WANs?

A)To provide remote access to individuals.
B)To provide site-to-site networking.
C)To provide access to the Internet.
D)All of the above.

Question 72

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 73

In a routed LAN,routers divide the LAN into smaller groups of Ethernet switches called ________.

A)segments
B)Ethernet LANs
C)clusters
D)subnets
E)VLANs

Question 74

________ can install transmission lines between corporate sites.

A)Corporations themselves
B)Carriers
C)Both A and B

Question 75

Most ________ links operate at 256 kbps to 50 Mbps.

A)LAN
B)MAN
C)WAN
D)All of the above.
E)Both a.and c.

Question 76

Leased lines standards are different around the world at speeds ________.

A)below about 50 Mbps
B)above about 50 Mbps
C)Leased line speeds around the world are about equally different in both speed ranges.

Question 77

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 78

In 802.1X,the workgroup switch is the ________.

A)authentication server
B)authenticator server
C)Both A and B
D)Neither A nor B

Question 79

T1 leased lines run at a speed of about ________.

A)10 kbps
B)50 kbps
C)750 kbps
D)1 Mbps
E)Any of the above.

Question 80

Ethernet switches can provide enough power over UTP for ________.

A)wireless access points
B)laptop computers
C)Both A and B
D)Neither A nor B