Deck 9: Understanding Wan Connection Choices

Question 1

Both switched and permanent virtual circuits are examples of packet switching.

Answer 1

True

Question 2

Only the bottom layer of SONET has an actual correspondence to the OSI model.

Answer 2

True

Question 3

A(n)____ is a network device that can receive multiple inputs and transmit them to a single shared network medium.

A)multiplexer
B)decoder
C)adder
D)shifter

Answer 3

A

Question 4

Current frame relay implementations can reach maximum speeds of up to ____ over DS-3 links.

A)64 Kbps
B)2.08 Mbps
C)10 Mbps
D)45 Mbps

Question 5

An ATM switched virtual circuit (ATM SVC)is a permanent connection.

Question 6

In the ____ mode service of an ISDN, several circuits can be used during a communications session.

A)circuit
B)switching
C)relay
D)packet

Question 7

The current practical limit for transmitting a user's data with ISDN is 622 Mbps.

Question 8

Frame relay uses only two communications layers: the ____ layer and the Link Access Protocol for Frame Mode Bearer Services (LAPF).

A)Network
B)Transport
C)Physical
D)Presentation

Question 9

The 1992 update of the X.25 protocol includes maximum transmission speeds of up to ____.

A)64 Kbps
B)1 Mbps
C)2.048 Mbps
D)10 Mbps

Question 10

Like some other WAN technologies, such as frame relay, ATM uses virtual circuits that are called ____.

A)channels
B)streams
C)connections
D)bands

Question 11

Circuit mode is most commonly employed in voice transmissions.

Question 12

Switched Multimegabit Data Service (SMDS), which primarily supports data transmission, converts packets received from LANs into ____.

A)frames
B)containers
C)cells
D)messages

Question 13

ISDN Layer ____ manages control signaling and ensures maximum detection of communication errors for highly reliable communications.

A)1
B)2
C)3
D)4

Question 14

ATM employs a ____-layer architecture, called the ATM Protocol Reference Model.

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

Question 15

Two types of virtual connections exist within frame relay: permanent and ____.

A)switched
B)routed
C)bridged
D)gated

Question 16

The maximum upstream transmission rate attainable using DSL is ____ Mbps.

A)1
B)2.3
C)10
D)52

Question 17

The ____-compression multiplexing method sends 16- to 24-bit blocks of data in alternating digital bursts.

A)time
B)voice
C)code
D)data

Question 18

A ____ typically contains a fixed amount of data formatted to be transmitted at high speeds, from 155 Mbps to over 1 Gbps.

A)packet
B)cell
C)frame
D)message

Question 19

An X.25 network can transmit data packets using one of three modes: switched virtual circuits, permanent virtual circuits, and ____.

A)messages
B)datagrams
C)frames
D)pages

Question 20

The Basic Rate Interface (BRI)ISDN has an aggregate data rate of ____.

A)16 Kbps
B)64 Kbps
C)144 Kbps
D)1.536 Mbps

Question 21

What are the advantages and disadvantages of Switched Multimegabit Data Service (SMDS)?

Question 22

Identify and describe three types of services offered by frame relay service providers.

Question 23

To use DSL, you must install a(n)____________________ adapter in the device that is to be connected to the DSL network.

Question 24

____ version offers very high bandwidth and is intended as an alternative to networking technologies that use coaxial or fiber-optic cable.

A)SHDSL
B)SDSL
C)HDSL
D)VDSL

Question 25

____________________ mode means that your communications circuit lasts for the duration of the communications session and is used exclusively by the two connected devices until it is terminated.

Question 26

____ enables the transmission rate to vary depending on whether the communication is data, multimedia, or voice.

A)RADSL
B)ADSL
C)G.lite ADSL
D)IDSL

Question 27

Compare and contrast a DSL adapter with a cable modem.

Question 28

Identify and describe the three principal devices used in X.25 communications.

Question 29

The basic Synchronous Digital Hierarchy (SDH)transmission rate is ____ Mbps.

A)51.84
B)155.2
C)466.56
D)622.08

Question 30

SONET travels in a ____ topology.

A)star
B)ring
C)mesh
D)bus

Question 31

_________________________ are typically privately owned and operated networks that provide data communications services to the public.

Question 32

What is the role of the frame relay assembler/disassembler (FRAD)in frame relay communications?

Question 33

Describe five useful applications for SONET technology.

Question 34

____ is a fiber-optic technology that can transmit data faster than one gigabit per second.

A)ADSL
B)ISDN
C)SONET
D)X.25

Question 35

Describe an ATM switched virtual circuit (ATM SVC).

Question 36

How does ISDN use the echo cancellation method of transmission?

Question 37

High-speed ____________________ Ethernet technologies are alternatives to SONET and frame relay for dominance in Ethernet-based metropolitan area networks (MANs)over fiber-optic cable.

Question 38

____________________ suppression is a technique that detects periods of silence between words, or as a conversation shifts from one person to the other.

Question 39

Provide a high-level description of broadband ISDN (B-ISDN).

Question 40

The ____ layer of SONET encapsulates data, ensures that data is sent in the correct order, ensures the timing of each frame, and checks for transmission errors.

A)Line
B)Path
C)Photonic
D)Section

Question 42

How does SONET use unidirectional path switching to provide failure recovery?