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Computer Networking

Computer Networking
Which of the following network access standard is used for connecting stations to a circuit-switched network?

X.25
X.75
X.3
None of these
X.21

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Computer Networking
Which statements are true regarding ICMP packets?1. ICMP guarantees datagram delivery.2. ICMP can provide hosts with information about network problems.3. ICMP is encapsulated within IP datagrams.4. ICMP is encapsulated within UDP datagrams.

1 only
1 and 4
2 and 3
All of these

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

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

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Computer Networking
A remote batch-processing operation in which data is solely input to a central computer would require a:

All listed here
simplex lines
telegraph line
None of these
mixedband channel

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Computer Networking
For connecting modem, a computer must be equipped with a port that conforms to the RS-232 standard of the Electronic Industries Association of America. What do the letters 'RS' stand for?

None of these
Registered source
Recognised standard
Recommended standard
Random sequence

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Computer Networking
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?

IPSec
HDLC
xDSL
VPN
Cable

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