साइबर सुरक्षा, IT नीति र विद्युतीय कारोबार ऐन – Cyber Security, IT Policy & ETA MCQ
साइबर सुरक्षा, IT नीति र विद्युतीय कारोबार ऐन – कम्प्युटर र IT
Cyber Security, IT Policy & ETA · Computer & IT (Technical) · ४०४ प्रश्न
४०४ प्रश्न उपलब्ध। मोड छान्नुहोस्:
साइबर सुरक्षा, IT नीति र विद्युतीय कारोबार ऐन: 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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An attack in which valid data transmission, such as a login message, is captured and fraudulently re-sent later is a:
सही उत्तर: क) Replay attack
Timestamps, nonces and session tokens that expire are used to defeat replay attacks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Smurf attack is a denial-of-service attack that:
सही उत्तर: घ) Sends ICMP echo requests with the victim's spoofed address to a network's broadcast address
Every host on the broadcast network replies to the victim, amplifying the traffic; disabling directed broadcasts prevents it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A SYN flood attack works by:
सही उत्तर: ग) Sending many TCP SYN requests without completing the handshake, exhausting the server's connection table
Half-open connections fill the server's backlog so legitimate clients cannot connect; SYN cookies are a common defence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Leaving malware-infected USB drives in a car park in the hope that employees will plug them into office computers is an example of:
सही उत्तर: ख) Baiting
Baiting uses an attractive item to lure victims into compromising their own systems.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A social engineering attack in which the attacker invents a believable scenario, such as pretending to be from the IT help desk, to obtain information is called:
सही उत्तर: क) Pretexting
Pretexting relies on a fabricated story (pretext) to gain the victim's trust.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Searching through an organisation's discarded papers and storage media to find sensitive information is called:
सही उत्तर: घ) Dumpster diving
Shredding documents and securely wiping media before disposal prevents dumpster diving.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Phishing carried out through SMS text messages is called:
सही उत्तर: ग) Smishing
Smishing = SMS + phishing; vishing uses voice calls and whaling targets top executives.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An attack in which stolen username-password pairs from one breached website are automatically tried on many other websites is called:
सही उत्तर: ख) Credential stuffing
Credential stuffing works because people reuse passwords; unique passwords and MFA defeat it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many different 8-character passwords can be formed from uppercase letters, lowercase letters and digits (62 symbols, repetition allowed)?
सही उत्तर: क) 62^8 ≈ 2.18 × 10^14
Each of the 8 positions has 62 choices, so the total is 62^8 = 218,340,105,584,896.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A brute-force attack against a 56-bit key must try, on average, how many keys before finding the right one?
सही उत्तर: घ) 2^55
There are 2^56 possible keys; on average half of them, 2^55, must be tried.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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