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The SecOps Group Certified Network Security Practitioner 認定 CNSP 試験問題 (Q26-Q31):

質問 # 26
What is the response from an open UDP port which is behind a firewall (port is open on the firewall)?

• A. ICMP message showing Port Unreachable
• B. A SYN Packet
• C. No response
• D. A FIN Packet

正解：C

解説：
UDP (User Datagram Protocol), per RFC 768, is connectionless, lacking TCP's handshake or acknowledgment mechanisms. When a UDP packet reaches a port:
Closed Port: The host typically sends an ICMP "Destination Port Unreachable" (Type 3, Code 3) unless suppressed (e.g., by firewall or OS settings).
Open Port: If a service is listening (e.g., DNS on 53/UDP), it processes the packet but doesn't inherently reply unless the application protocol requires it (e.g., DNS sends a response).
Scenario: An open UDP port behind a firewall, with the firewall rule allowing traffic (e.g., permit udp any host 10.0.0.1 eq 123). The packet reaches the service, but UDP itself doesn't mandate a response. Most services (e.g., NTP, SNMP) only reply if the packet matches an expected request. In this question's generic context (no specific service), no response is the default, as the firewall permits the packet, and the open port silently accepts it without feedback.
Security Implications: This silence makes UDP ports harder to scan (e.g., Nmap assumes "open|filtered" for no response), but exposed open ports risk amplification attacks (e.g., DNS reflection). CNSP likely contrasts UDP's behavior with TCP for firewall rule crafting.
Why other options are incorrect:
A . ICMP message showing Port Unreachable: Occurs for closed ports, not open ones, unless the service explicitly rejects the packet (rare).
C . A SYN Packet: SYN is TCP-specific (handshake initiation), irrelevant to UDP.
D . A FIN Packet: FIN is TCP-specific (connection closure), not UDP.
Real-World Context: Testing UDP 53 (DNS) with dig @8.8.8.8 +udp yields a response, but generic UDP probes (e.g., nc -u) often get silence.

質問 # 27
What kind of files are "Dotfiles" in a Linux-based architecture?

• A. Driver files
• B. Library files
• C. Hidden files
• D. System files

正解：C

解説：
In Linux, file visibility is determined by naming conventions, impacting how files are listed or accessed in the file system.
Why D is correct: "Dotfiles" are files or directories with names starting with a dot (e.g., .bashrc), making them hidden by default in directory listings (e.g., ls requires -a to show them). They are commonly used for user configuration, as per CNSP's Linux security overview.
Why other options are incorrect:
A: Library files (e.g., in /lib) aren't inherently hidden.
B: Driver files (e.g., kernel modules in /lib/modules) aren't dotfiles by convention.
C: System files may or may not be hidden; "dotfiles" specifically denotes hidden status.

質問 # 28
Which SMB (Server Message Block) network protocol versions are vulnerable to the EternalBlue (MS17-010) Windows exploit?

• A. SMBv2 only
• B. SMBv3 only
• C. Both SMBv1 and SMBv2
• D. SMBv1 only

正解：D

解説：
EternalBlue (MS17-010) is an exploit targeting a buffer overflow in Microsoft's SMB (Server Message Block) implementation, leaked by the Shadow Brokers in 2017. SMB enables file/printer sharing:
SMBv1 (1980s): Legacy, used in Windows NT/XP.
SMBv2 (2006, Vista): Enhanced performance/security.
SMBv3 (2012, Windows 8): Adds encryption, multichannel.
Vulnerability:
EternalBlue exploits a flaw in SMBv1's SRVNET driver (srv.sys), allowing remote code execution via crafted packets. Microsoft patched it in March 2017 (MS17-010).
Affected OS: Windows XP to Server 2016 (pre-patch), if SMBv1 enabled.
Proof: WannaCry/NotPetya used it, targeting port 445/TCP.
SMBv1 Only: The bug resides in SMBv1's packet handling (e.g., TRANS2 requests). SMBv2/v3 rewrote this code, immune to the specific overflow.
Microsoft: Post-patch, SMBv1 is disabled by default (Windows 10 1709+).
Security Implications: CNSP likely stresses disabling SMBv1 (e.g., via Group Policy) and patching, as EternalBlue remains a threat in legacy environments.
Why other options are incorrect:
B, C: SMBv2/v3 aren't vulnerable; the flaw is SMBv1-specific.
D: SMBv2 isn't affected, only SMBv1.
Real-World Context: WannaCry's 2017 rampage hit unpatched SMBv1 systems (e.g., NHS), costing billions.

質問 # 29
If a hash begins with $2a$, what hashing algorithm has been used?

• A. Blowfish
• B. SHA256
• C. SHA512
• D. MD5

正解：A

解説：
The prefix $2a$ identifies the bcrypt hashing algorithm, which is based on the Blowfish symmetric encryption cipher (developed by Bruce Schneier). Bcrypt is purpose-built for password hashing, incorporating:
Salt: A random string (e.g., 22 Base64 characters) to thwart rainbow table attacks.
Work Factor: A cost parameter (e.g., $2a$10$ means 2