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Free PDF Quiz 2025 Marvelous The SecOps Group CNSP: Detail Certified Network Security Practitioner Explanation
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The SecOps Group Certified Network Security Practitioner Sample Questions (Q49-Q54):
NEW QUESTION # 49
What is the response from a closed UDP port which is not behind a firewall?
- A. No response
- B. None of the above
- C. ICMP message showing Destination Unreachable
- D. A RST packet
Answer: C
Explanation:
UDP is a connectionless protocol, and its behavior when a packet reaches a port depends on whether the port is open or closed. Without a firewall altering the response, the standard protocol applies.
Why A is correct: When a UDP packet is sent to a closed port, the host typically responds with an ICMP Type 3 (Destination Unreachable), Code 3 (Port Unreachable) message, indicating no service is listening. CNSP notes this as a key indicator in port scanning.
Why other options are incorrect:
B: RST packets are TCP-specific, not used in UDP.
C: No response occurs for open UDP ports unless an application replies, not closed ports.
D: A is correct, so "none of the above" is invalid.
NEW QUESTION # 50
The Management Information Base (MIB) is a collection of object groups that is managed by which service?
- A. NTP
- B. SNMP
- C. TACACS
- D. SMTP
Answer: B
Explanation:
The Management Information Base (MIB) is a structured database defining manageable objects (e.g., CPU usage, interface status) in a network device. It's part of the SNMP (Simple Network Management Protocol) framework, per RFC 1157, used for monitoring and managing network devices (e.g., routers, switches).
SNMP Mechanics:
MIB Structure: Hierarchical, with Object Identifiers (OIDs) like 1.3.6.1.2.1.1.1.0 (sysDescr).
Ports: UDP 161 (agent), 162 (traps).
Operation: Agents expose MIB data; managers (e.g., Nagios) query it via GET/SET commands.
MIB files (e.g., IF-MIB, HOST-RESOURCES-MIB) are vendor-specific or standardized, parsed by SNMP tools (e.g., snmpwalk). CNSP likely covers SNMP for network monitoring and securing it against enumeration (e.g., weak community strings like "public").
Why other options are incorrect:
A . SMTP (Simple Mail Transfer Protocol): Email delivery (TCP 25), unrelated to MIB or device management.
C . NTP (Network Time Protocol): Time synchronization (UDP 123), not MIB-related.
D . TACACS (Terminal Access Controller Access-Control System): Authentication/authorization (TCP 49), not MIB management.
Real-World Context: SNMP misconfiguration led to the 2018 Cisco switch exploits via exposed MIB data.
NEW QUESTION # 51
Which of the following represents a valid Windows Registry key?
- A. HKEY_ROOT_CLASSES
- B. HKEY_LOCAL_MACHINE
- C. HKEY_LOCAL_USER
- D. HKEY_INTERNAL_CONFIG
Answer: B
Explanation:
The Windows Registry is a hierarchical database storing system and application settings, organized into predefined root keys (hives). Only specific names are valid as top-level keys.
Why A is correct: HKEY_LOCAL_MACHINE (HKLM) is a standard root key containing hardware and system-wide configuration data. CNSP references it for security settings analysis (e.g., auditing policies).
Why other options are incorrect:
B: HKEY_INTERNAL_CONFIG is not a valid key; no such hive exists.
C: HKEY_ROOT_CLASSES is a misspelling; the correct key is HKEY_CLASSES_ROOT (HKCR).
D: HKEY_LOCAL_USER is incorrect; the valid key is HKEY_CURRENT_USER (HKCU).
NEW QUESTION # 52
WannaCry, an attack, spread throughout the world in May 2017 using machines running on outdated Microsoft operating systems. What is WannaCry?
Answer: B
Explanation:
WannaCry is a ransomware attack that erupted in May 2017, infecting over 200,000 systems across 150 countries. It exploited the EternalBlue vulnerability (MS17-010) in Microsoft Windows SMBv1, targeting unpatched systems (e.g., Windows XP, Server 2003). Developed by the NSA and leaked by the Shadow Brokers, EternalBlue allowed remote code execution.
Ransomware Mechanics:
Encryption: WannaCry used RSA-2048 and AES-128 to encrypt files, appending extensions like .wcry.
Ransom Demand: Displayed a message demanding $300-$600 in Bitcoin, leveraging a hardcoded wallet.
Worm Propagation: Self-replicated via SMB, scanning internal and external networks, unlike typical ransomware requiring user interaction (e.g., phishing).
Malware Context: While WannaCry is malware (malicious software), "ransomware" is the precise subcategory, distinguishing it from viruses, trojans, or spyware. Malware is a broad term encompassing any harmful code; ransomware specifically encrypts data for extortion. CNSP likely classifies WannaCry as ransomware to focus on its payload and mitigation (e.g., patching, backups).
Why other options are incorrect:
B . Malware: Correct but overly generic. WannaCry's defining trait is ransomware behavior, not just maliciousness. Specificity matters in security taxonomy for threat response (e.g., NIST IR 8019).
Real-World Context: WannaCry crippled NHS hospitals, highlighting patch management's criticality. A kill switch (a domain sinkhole) halted it, but variants persist.
NEW QUESTION # 53
What types of attacks are phishing, spear phishing, vishing, scareware, and watering hole?
- A. Probes
- B. Social engineering
- C. Insider threats
- D. Ransomware
Answer: B
Explanation:
Social engineering exploits human psychology to manipulate individuals into divulging sensitive information, granting access, or performing actions that compromise security. Unlike technical exploits, it targets the "human factor," often bypassing technical defenses. The listed attacks fit this category:
Phishing: Mass, untargeted emails (e.g., fake bank alerts) trick users into entering credentials on spoofed sites. Uses tactics like urgency or trust (e.g., typosquatting domains).
Spear Phishing: Targeted phishing against specific individuals/organizations (e.g., CEO fraud), leveraging reconnaissance (e.g., LinkedIn data) for credibility.
Vishing (Voice Phishing): Phone-based attacks (e.g., fake tech support calls) extract info via verbal manipulation. Often spoofs caller ID.
Scareware: Fake alerts (e.g., "Your PC is infected!" pop-ups) scare users into installing malware or paying for bogus fixes. Exploits fear and urgency.
Watering Hole: Compromises trusted websites frequented by a target group (e.g., industry forums), infecting visitors via drive-by downloads. Relies on habitual trust.
Technical Details:
Delivery: Email (phishing), VoIP (vishing), web (watering hole/scareware).
Payloads: Credential theft, malware (e.g., trojans), or financial fraud.
Mitigation: User training, email filters (e.g., DMARC), endpoint protection.
Security Implications: Social engineering accounts for ~90% of breaches (e.g., Verizon DBIR 2023), as it exploits unpatchable human error. CNSP likely emphasizes awareness (e.g., phishing simulations) and layered defenses (e.g., MFA).
Why other options are incorrect:
A . Probes: Reconnaissance techniques (e.g., port scanning) to identify vulnerabilities, not manipulation-based like these attacks.
B . Insider threats: Malicious actions by authorized users (e.g., data theft by employees), not external human-targeting tactics.
D . Ransomware: A malware type (e.g., WannaCry) that encrypts data for ransom, not a manipulation method-though phishing often delivers it.
Real-World Context: The 2016 DNC hack used spear phishing to steal credentials, showing social engineering's potency.
NEW QUESTION # 54
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