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Networking > Ch 12: Wide Area Network > Flashcards

Ch 12: Wide Area Network Flashcards

1
Q

What is the maximum throughput of a DS3 connection?

A

44.736 Mbps

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2
Q

Multiplexing enables a single T1 circuit to carry how many channels?

A

24

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3
Q

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

A

64 Kbps

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4
Q

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

A

53 bytes

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5
Q

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

A

You pay only for the bandwidth you require.

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6
Q

Of all the DSL standards, which is the most commonly in use today?

A

ADSL

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7
Q

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

A

CSU/DSU

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8
Q

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

A

OC-48

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9
Q

The C-Band utilized by satellites consists of what frequency range?

A

3.4 - 6.7 GHz

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10
Q

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

A

Carrier Ethernet Transport

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11
Q

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

A

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

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12
Q

The T-carrier standards, also called T-CXR standards, utilize what type of multiplexing over two wire pairs to create multiple channels?

A

time division multiplexing (TDM)

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13
Q

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

A

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

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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?

A

switched virtual circuit (SVC)

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15
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?

A

SONET (Synchronous Optical Network)

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16
Q

Where are MPLS labels placed within a frame?

A

between the layer 2 header and the layer 3 header

17
Q

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

A

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

18
Q

Which statement regarding the Asynchronous Transfer Mode (ATM) technology is accurate?

A

ATM can provide 4 levels of QoS, from best effort delivery to guaranteed, real-time transmission.

19
Q

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

A

time division multiple access (TDMA)

20
Q

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

A

Satellite services suffer more latency and jitter issues.

21
Q

Considering that multiple users occupy the same channel when using CDMA, how are various calls using this technology kept separate?

A

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

22
Q

Which SONET OC level is a popular choice for large businesses, and is equivalent to 100 T1s?

A

OC-3

23
Q

With a SIP trunk, what is the only limitation on the number of calls that can run at any one time?

A

The amount of available bandwidth.

24
Q

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

A

Basic Rate Interface (BRI)

25
Q

In a public switched telephone network, what portion of the network is known as the local loop?

A

It is the portion that connects any residence or business to the nearest central office.

26
Q

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

A

SDSL

27
Q

When using DOCSIS 3.0, what is the minimum number of channels that can be used?

A

4

28
Q

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

A

64 Kbps

29
Q

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

A

They connect to a mobile switching center.

30
Q

How many transponders are contained within a typical satellite?

A

24 to 32

Networking (13 decks)

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