नेटवर्किङ र इन्टरनेट – Networking & Internet MCQ
नेटवर्किङ र इन्टरनेट – कम्प्युटर र IT
Networking & Internet · Computer & IT (Technical) · ४०१ प्रश्न
४०१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
नेटवर्किङ र इन्टरनेट: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Wired Ethernet operating in half-duplex mode on a shared medium uses which media access method?
सही उत्तर: ख) CSMA/CD
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) senses the cable, detects collisions and retransmits after a random backoff.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Manchester encoding, used in classic 10 Mbps Ethernet:
सही उत्तर: घ) There is a transition in the middle of every bit period
The mid-bit transition carries both data and clock, which makes synchronization easy but doubles the required bandwidth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A signal travels 2000 km through a cable in which the propagation speed is 2 × 10^8 m/s. What is the propagation delay?
सही उत्तर: ग) 10 ms
Propagation delay = distance / speed = 2 × 10^6 m / 2 × 10^8 m/s = 0.01 s = 10 ms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A modem transmits at 4800 baud using 16-QAM, in which each signal element carries 4 bits. What is its bit rate?
सही उत्तर: ग) 19200 bps
Bit rate = baud rate × bits per symbol = 4800 × log2(16) = 4800 × 4 = 19200 bps.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which multiplexing technique is used in optical fibre to send several signals on different wavelengths (colours) of light?
सही उत्तर: क) Wavelength Division Multiplexing (WDM)
WDM is essentially frequency division multiplexing for light, with each channel on its own wavelength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with multimode fibre, single-mode optical fibre:
सही उत्तर: क) Has a very thin core and supports much longer distances
Single-mode fibre (core about 9 µm) carries one light mode with little dispersion, so it is used for long-haul links.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which type of UTP cable is traditionally used to connect two computers directly to each other (like devices) without a switch?
सही उत्तर: घ) Crossover cable
A crossover cable swaps the transmit and receive pairs; many modern NICs with Auto-MDIX can also adapt automatically.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the name 100BASE-TX, the word 'BASE' indicates:
सही उत्तर: ग) Baseband signalling
In Ethernet names the number is the speed in Mbps, BASE means baseband transmission and the suffix shows the medium (T = twisted pair).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum recommended length of a single UTP (twisted pair) Ethernet cable segment, such as Cat5e or Cat6 for 1000BASE-T, is:
सही उत्तर: ख) 100 metres
Twisted-pair Ethernet standards specify up to 100 m per segment between devices.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the IEEE 802 model, the data link layer is divided into which two sublayers?
सही उत्तर: घ) LLC (Logical Link Control) and MAC (Media Access Control)
The LLC sublayer interfaces with the network layer, while the MAC sublayer controls access to the shared medium and handles MAC addresses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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