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Computer Networking

Computer Networking
The OCR reading unit attached to a POS terminal is called a

wand
All of these
cursor
light pen
None of these

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Computer Networking
Data link layer retransmits the damaged frames in most networks. If the probability of a frame's being damaged is p, what is the mean number of transmissions required to send a frame if acknowledgements are never lost.

None of these
KIK (1 + F)
P I (K + 1)
K I (K - P)
1/ (1 - F)

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Computer Networking
What frequency range is used for microwave communications, satellite and radar?

Medium Frequency : 300 kHz to 3 MHz
Extremely High Frequency :30,000 MHz
Low Frequency : 30 kHz to 300 kHz
None of these
Super High Frequency : 3000 MHz to 30000 MHz

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Computer Networking
A network consists of eight NT servers. You are planning to move servers to different segments of your network, what utility should be used at each server to determine which server generates the most traffic?

NBTSTAT
ARP.EXE
NETSTAT.EXE
Network Monitor
Performance Monitor

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Computer Networking
00 represents a pixel that pixel is known as :

Dark gray pixel
Black pixel
White pixel
Light gray

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Computer Networking
Which of the following is required to communicate between two computers?

All of these
access to transmission medium
communications hardware
protocol
communications software

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