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Data Communication > Chapter 12: Wide Area Network > Flashcards

Chapter 12: Wide Area Network Flashcards

1
Q

A fractional T1’s bandwidth can be leased multiples of what data rate?

28 Kbps
48 Kbps
32 Kbps
64 Kbps

A

64 Kbps

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2
Q

Considering that multiple users occupy the same channel when using CDMA, how are various calls using this technology kept separate?
The packets include the end user’s SIM IMEI in each packet.

The packets are coded such that individual calls can be distinguished.

The transmissions are encrypted, such that only the appropriate device can decrypt its own call.

The sending and receiving of data is performed on different frequencies.

Users hop between these frequencies to avoid interference.
A

The packets are coded such that individual calls can be distinguished.

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3
Q

In North America, what ISDN connection type used two B channels and one D channel?

Bearer Rate Interface (BRI)
Basic Rate Interface (BRI)
Primary Rate Interface (PRI)
Dedicated Rate Interface (DRI)

A

Basic Rate Interface (BRI)

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4
Q

In a cellular network, where does each wireless base station connect to?

They connect directly to the central office.

They connect to other wireless base stations, then to the central office.

They connect to a wireless station repeater.

They connect to a mobile switching center.

A

They connect to a mobile switching center.

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5
Q

In an ISDN connection, what amount of throughput did a single B channel provide?

48 Kbps
32 Kbps
96 Kbps
64 Kbps

A

64 Kbps

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6
Q

In metro settings, end-to-end, carrier-grade Ethernet networks can be established via what protocol?

Intra-city Ethernet
Metro Carrier Transport
Ethernet SONET
Carrier Ethernet Transport

A

Carrier Ethernet Transport

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7
Q

Of all the DSL standards, which is the most commonly in use today?
VDSL
SDSL
G.Lite
ADSL

A

ADSL

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8
Q

On an ATM network, how is the path that data will take determined?

Data is transmitted, and then the path taken will vary depending on the load encountered at each ATM participant node.

Switches determine the optimal path between sender and receiver, and then establish the path before transmission.

A frame relay route table establishes each hop that will be taken to a single destination.

When data is ready to be transmitted, an ATM participating router will contact the destination ATM router, establish a tunnel, then pass the data.

A

Switches determine the optimal path between sender and receiver, and then establish the path before transmission.

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9
Q

The DTE or endpoint device for a leased line is known as which device below?

CSU/DSU
DSL modem
cable modem
ISDN modem

A

CSU/DSU

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10
Q

The Global System for Mobile Communications (GSM) utilizes what technology to create timeslots on a channel?

time division multiple access (TDMA)
frequency division multiplexing (FDM)
wavelength division multiplexing (WDM)
dense wavelength division multiplexing (DWDM)

A

time division multiple access (TDMA)

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11
Q

What OC level is primarily used as a regional ISP backbone, and occasionally by very large hospitals, universities, or other major enterprises?

OC-12
OC-48
OC-96
OC-3

A

OC-48

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12
Q

What is a data-link connection identifier (DLCI) utilized for?

It is used by routers to establish a packet-switched path to the destination.

It is used by routers to determine which circuit to forward a frame to in a frame relay network.

It is a locally significant ID used to send connectionless information.

It is used by ATM switches to determine how to create a switched virtual circuit.

A

It is used by routers to determine which circuit to forward a frame to in a frame relay network.

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13
Q

What is the size of an ATM cell, including the header?

64 bytes
53 bytes
84 bytes
48 bytes

A

53 bytes

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14
Q

What type of virtual circuit allows connections to be established when parties need to transmit, then terminated after the transmission is complete?
r
switched virtual circuit (SVC)
permanent virtual circuit (PVC)
dynamic virtual circuit (DVC)
looping virtual circuit (LVC)

A

switched virtual circuit (SVC)

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15
Q

When using satellite services for your WAN connection, what statement is accurate?

Satellite services are only available for fixed location clients.

Satellite uplink rates range from 5 to 10 Mbps.

Satellite services suffer more latency and jitter issues.

Satellite downlink rates range from 50 to 100 Mbps.

A

Satellite services suffer more latency and jitter issues.

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16
Q

Where are MPLS labels placed within a frame?

between the layer 2 header and the layer 3 header

between the data payload and the layer 2 trailer

between the layer 3 header and the data payload

at the end of the layer 2 trailer

A

between the layer 2 header and the layer 3 header

17
Q

Which of the following Layer 1 WAN technologies is not normally used as last mile service, but rather traverses multiple ISP networks, connecting these networks to the Internet backbone?

Carrier-Ethernet Transport (CET)

digital subscriber line (DSL)

SONET (Synchronous Optical Network)

T-carrier (T1s, fractional T1s, and T3s)

A

SONET (Synchronous Optical Network)

18
Q

Which of the following is an advantage of leasing a frame relay circuit over leasing a dedicated circuit?

You are guaranteed to receive the maximum amount of bandwidth specified in the circuit contract

The paths that your data will take are always known.

Frame relay is a newly established network technology with more features than other technology.

You pay only for the bandwidth you require.

A

You pay only for the bandwidth you require.

19
Q

Which statement regarding the use of cable modems is NOT accurate?

Cable modems only operate at the Physical layer of the OSI model.

DOCSIS 3.1 allows for full duplex speeds up to 10 Gbps.

Cable broadband provides a dedicated and continuous connection.

Modems that utilize the DOCSIS 3.0 or 3.1 standard are backward compatible with older DOCSIS networks.

A

Cable modems only operate at the Physical layer of the OSI model.

20
Q

Which type of DSL technology has equal download and upload speeds maxing out at around 2 Mbps?

HDSL
ADSL2+
VDSL
SDSL

A

SDSL

Data Communication (12 decks)

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