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CompTIA Network+ Study Guide, Fourth Edition (Exam N10-007) > Wide Area Networks > Flashcards

Wide Area Networks Flashcards

1
Q

Which of the following is not a WAN protocol or technology?

ATM

MPLS

RIP

A

RIP

Routing Information Protocol (RIP) is not a WAN protocol but a routing protocol used in internetworks

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2
Q

What OSI model layers do WAN protocols operate in?

Layer 6, Layer 4, Layer 2

Transport, Data Link, Network

Physical, Data Link, Network

A

Physical, Data Link, Network

These different protocols and technologies all occupy the lower three layers of the OSI model: the Physical layer, the Data Link layer, and sometimes the Network layer. Most WAN protocols work only at the Physical layer and Data Link layer

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3
Q

If you have a device in a telecommunications closet owned and installed by the telecommunications company (telco) and it’s your responsibility to cable from this box to the CPE, which term should you use to refer to the device?

Customer premises equipment

Demarcation point

Toll network

A

Demarcation point

The demarcation point is the precise spot where the service provider’s responsibility ends and the CPE begins

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4
Q

You have an E1. How many DSOs are used in this point-to-point connection?

24

30

32

A

32

The European version of the T1 is the E1, which operates at 2.048 Mbps and uses 30 64 Kbps channels (30 DS0s), and two channels are used for D channels, which makes 32 total DS0s

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5
Q

Where does the local exchange carrier responsibility end and your responsibility begin on a WAN link?

POP

Central office

Demarc

A

Demarc

The demarc is the precise spot where the service provider’s (local exchange carrier’s) responsibility ends and the CPE begins. It’s generally a device in a telecommunications closet owned and installed by the telecommunications company (telco)

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6
Q

You have a small office, home office environment. What WAN technology would most likely be used?

T3

Frame Relay

Cable modem

A

Cable modem

Cable is a great cost-effective connection for a small office or home office (SOHO)

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7
Q

Which type of communication has a line speed of 1.544 Mbps (millions of bits per second)?

T3

T1C

T1

A

T1

A T1 has a line speed of 1.544 Mbps. This 1.544 Mbps connection uses Digital Signal 1 (DS1) and aggregates 24 discrete 64 Kbps channels that use Digital Signal 0 (DS0). Other T-series connections have greater maximum connection speeds

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8
Q

Which cellular WAN technology has the best data rate?

HSPA

HSPA+

LTE

A

LTE

LTE is true 4G and has the best data rates

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9
Q

Which is not a common optical carrier level (OC-x)?

OC-1

OC-4

OC-12

A

OC-4

OC-1, OC-3, OC-12, OC-48, and OC-192 are the normal service offerings. OC-1 has the lowest data rate at 51.84 Mbps, and OC-192 is the highest at 9.953 Gbps

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10
Q

Which wireless protocol utilizes a short-range communications technology facilitating data transmission from fixed and/or mobile devices, creating wireless personal area networks (PANs)?

Bluetooth

Microwave radio relay

Comsat

A

Bluetooth

Bluetooth uses a radio technology called Frequency Hopping Spread Spectrum. It chops up the data being sent and transmits chunks of it through the air on up to 75 different frequencies

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11
Q

What does the x in xDSL represent?

Wire type

Transmission speed

DSL type

A

DSL type

The x in xDSL represents the different letters that refer to the DSL flavors. xDSLs use high-frequency signals, whereas regular phone calls use low-frequency signals over the same lines

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12
Q

Which is not a type of xDSL?

ADSL

HDSL

SONET

A

SONET

ADSL, HDSL, SDSL, VDSL or VHDSL, and VDSL2 are all common xDSL types. Synchronous Optical Network (SONET) is the standard for synchronous data transmission on optical fiber

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13
Q

What does the acronym DOCSIS stand for?

Data over cable systems Internet specification

Data over cable service Internet specification

Data over cable service interface specifications

A

Data over cable service interface specifications

DOCSIS stands for data over cable service Interface Specifications. All cable modems and like devices have to measure up to this standard

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14
Q

What is the bandwidth for OC-12?

1.544 Mbps

45 Mbps

622 Mbps

A

622 Mbps

Optical carrier 12 has speeds up to 622 Mbps

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15
Q

Which WAN protocol utilizes cell-switching technology?

Frame Relay

ISDN

ATM

A

ATM

ATM uses a high-speed cell-switching technology that can handle data as well as real-time voice and video. The ATM protocol breaks up transmitted data into 53-byte cells

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16
Q

Which WAN protocol utilizes packet-switched technology?

Frame Relay

ISDN

ATM

A

Frame Relay

Frame Relay is the frame WAN technology in which variable-length packets are transmitted by switching

17
Q

What is the CIR in Frame Relay?

Virtual circuit that is established when data needs to be transmitted

Maximum speed at which the Frame Relay interface can transmit

Rate at which the Frame Relay switch guarantees to transfer data

A

Rate at which the Frame Relay switch guarantees to transfer data

The committed information rate (CIR) is the rate, in bits per second, at which the Frame Relay switch guarantees to transfer data

18
Q

You are having DSL Internet connection issues and time-outs. You check the interface on your router and notice a lot of input errors. What could the problem be?

CSU/DSU

Demarc

Duplex configuration

A

Duplex configuration

We’re thinking in terms of a DSL, so a CSU/DSU is not used, nor is a demarc. If clocking was down, your Internet would be completely down. Input errors could be indicative of a duplex issue

19
Q

Which part of a SIP trunk is the responsibility of the provider?

Private domain

Community domain

Public domain

A

Public domain

The public domain (responsibility of the provider) is the part of the network that allows access into the PSTN (Public Switched Telephone Network) or PLMN (Public Land Mobile Network)

20
Q

Which technology can eliminate VPN traffic between remote sites traversing the hub?

DMVPN

SIP trunk

DMDW

A

DMVPN

Benefits of Dynamic Multipoint VPN include elimination of traffic between remote sites traversing the hub, elimination of additional bandwidth requirements at the hub, elimination of additional network delays, conservation of WAN bandwidth, lower costs for VPN circuits, and increased resiliency and redundancy

CompTIA Network+ Study Guide, Fourth Edition (Exam N10-007) (22 decks)

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