POWER SYSTEMS QUIZ

How often are BPDUs sent from a layer 2 device?

Every 30 seconds

Every 2 seconds

Never

Every 10 minutes

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Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?

HDLC

VPN

Cable

IPSec

xDSL

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If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is

9600 bands

None of these

4800 bands

3200 bands

1200 bands

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A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

64 Kbps

32 Kbps

None of these

8 Kbps

128 Kbps.

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Contention is

a continuous frequency capable of being modulated or impressed with a second signal

One or more conductors that serve as a common connection for a related group of devices

None of these

the condition when two or more stations attempt to use the same channel at the same time

a collection of interconnected functional units that provides a data communications service among stations attached to the network

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What is the result of segmenting a network with a bridge (switch)?1. It increases the number of collision domains.2. It decreases the number of collision domains.3. It increases the number of broadcast domains.4. It decreases the number of broadcast domains.5. It makes smaller collision domains.6. It makes larger collision domains.

3, 4 and 6

2, 3 and 5

1, 3 and 6

1 and 5

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With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts?

240

248

224

192

252

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Carrier is

a continuous frequency capable of being modulated or impressed with a second signal

a collection of interconnected functional units that provides a data communications service among stations attached to the network

None of these

the condition when two or more sections attempt to use the same channel at the same time

One or more conductors that serve as a common connection for a related group of devices

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Which file transfer protocol uses UDP?

None of these

TFTP

TELNET

NFS

FTP

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The synchronous modems are more costly than the asynchronous modems because

they transmit the data with stop and start bits.

they produce large volume of data

they contain clock recovery circuits

None of these

they operate with a larger bandwidth

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