In networking terminology UTP means
Answer: A
Correct answer: Unshielded Twisted pair
UTP is Unshielded Twisted Pair - pairs of wires twisted together to cancel interference, with no metal screen around them. Shielding gives STP.
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Number of cross point needed for 10 lines in a cross point switch which is full duplex in nature and there are no self-connection is
Answer: B
Correct answer: 45
A full-duplex line serves both directions, and no station connects to itself, so the number of connections is the number of unordered pairs:
\[ \binom{10}{2} = \frac{10\times 9}{2} = 45 \]
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Collision domain can be compared to which distance data travels between two stations ?
Answer: B
Correct answer: Maximum
The collision domain is bounded by the greatest distance a frame may travel and still be detected as a collision by the sender before it finishes transmitting. It is therefore a maximum distance, and it shrinks as the data rate rises.
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Which of these correctly states De Morgan’s first theorem?
Answer: A
Correct answer: \( \overline{A + B} = \bar{A} \cdot \bar{B} \)
De Morgan’s first theorem states that the complement of a sum is the product of the complements: \[ \overline{A + B} = \bar{A} \cdot \bar{B}. \] In words, NOT (A OR B) is the same as (NOT A) AND (NOT B). The second theorem is its dual: \[ \overline{A \cdot B} = \bar{A} + \bar{B}. \] A truth table confirms the first at once. Taking A and B as 0,0 gives \( \overline{0} = 1 \) on the left and \( 1 \cdot 1 = 1 \) on the right; every other combination gives 0 on both sides. The practical rule for applying either theorem is: break the bar, change the sign. Split the overbar, and swap AND for OR or OR for AND. The theorems matter because they allow any circuit to be rebuilt using only NAND gates or only NOR gates, which is why those two are called universal.
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What is the decimal equivalent of the hexadecimal number 2F?
Answer: B
Correct answer: 47
Each hexadecimal digit carries a place value that is a power of 16, read from the right: \( 16^{0} = 1 \) and \( 16^{1} = 16 \). In 2F the digit F stands for 15, so \[ 2 \times 16 + 15 = 32 + 15 = 47. \] The letters run A = 10, B = 11, C = 12, D = 13, E = 14, F = 15, and it is worth memorising them, since almost every hexadecimal question depends on the conversion. A quicker route for small values goes through binary. Each hexadecimal digit is four bits: 2 is 0010 and F is 1111, giving 00101111, which is \( 32 + 8 + 4 + 2 + 1 = 47 \). Conversion by grouping is faster than arithmetic once the sixteen four-bit patterns are familiar. The largest two-digit hexadecimal number is FF, which is 255 - the maximum value of one byte, and the reason colour codes and byte values are so often written this way.
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A terminal multiplexer has six 1200 bps terminals and n 300 bps terminals connected to it. The outgoing line is 9600 bps. What is the maximum value of n?
Answer: C
Correct answer: 8
The 300 bps terminals may use whatever the 1200 bps terminals leave:
\[ 9600 - 6\times 1200 = 2400\ \text{bps} \qquad n = \frac{2400}{300} = 8 \]
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The frequency range at which land coaxial cables are used is
Answer: A
Correct answer: 106 to 108 Hz
Land coaxial cable is used from about 1 MHz to 100 MHz. Below that the cable's advantage over twisted pair is slight; above it attenuation rises sharply and waveguide or fibre is preferred.
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In BCD, the decimal number 25 is represented as
Answer: A
Correct answer: 0010 0101
In binary coded decimal each decimal digit is encoded separately in four bits. So 25 becomes 2 and 5 encoded individually: 2 is 0010 and 5 is 0101, giving 0010 0101. This is not the same as the pure binary value of 25, which is 11001 - the second option, and the usual trap. BCD deliberately sacrifices compactness for ease of conversion. Because only ten of the sixteen four-bit patterns are used, the six combinations from 1010 to 1111 are invalid in BCD, and arithmetic must correct for them: when a BCD addition produces a result above 9 or generates a carry, 6 is added to bring it back into range. The code is used wherever numbers are displayed or entered digit by digit - calculators, digital clocks, instrument panels - because converting each digit to a seven-segment display needs no division. The waste is about 20 per cent of the available codes.
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Which among the following communications lines is best suited to interactive processing applications?
Answer: C
Correct answer: full duplex lines
Interactive work means a rapid exchange in both directions, and a full duplex line carries both at once so neither side waits for the line to turn round. A simplex line carries one direction only.
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Thick coax have maximum segment of
Answer: A
Correct answer: 500 m
Thick coaxial cable, the 10Base5 of the original Ethernet, allows a 500 m segment - the 5 in the name records it. Thin coax, 10Base2, manages about 185 m.
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