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CNSP Exams Dumps, CNSP Latest Exam Question
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The SecOps Group Certified Network Security Practitioner Sample Questions (Q60-Q65):
NEW QUESTION # 60
Which one of the following services is not a UDP-based protocol?
- A. IKE
- B. SSH
- C. NTP
- D. SNMP
Answer: B
Explanation:
Protocols are defined by their transport layer usage (TCP or UDP), impacting their security and performance characteristics.
Why D is correct: SSH (Secure Shell) uses TCP (port 22) for reliable, connection-oriented communication, unlike the UDP-based options. CNSP contrasts TCP and UDP protocol security.
Why other options are incorrect:
A: SNMP uses UDP (ports 161, 162) for lightweight network management.
B: NTP uses UDP (port 123) for time synchronization.
C: IKE (IPsec key exchange) uses UDP (ports 500, 4500).
NEW QUESTION # 61
Which SMB (Server Message Block) network protocol versions are vulnerable to the EternalBlue (MS17-010) Windows exploit?
- A. Both SMBv1 and SMBv2
- B. SMBv2 only
- C. SMBv3 only
- D. SMBv1 only
Answer: D
Explanation:
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.
NEW QUESTION # 62
What ports does an MSSQL server typically use?
- A. 1433/TCP, 1434/UDP, and 1434/TCP
- B. 1533/TCP, 1434/UDP, and 2434/TCP
- C. 1433/TCP, 2433/UDP, and 3433/TCP
- D. 1433/TCP, 2433/UDP, and 1434/TCP
Answer: A
Explanation:
Microsoft SQL Server (MSSQL) relies on specific ports for its core services, as defined by Microsoft and registered with IANA:
1433/TCP: The default port for the SQL Server Database Engine. Clients connect here for querying databases (e.g., via ODBC or JDBC). It's a well-known port, making it a frequent target for attacks if exposed.
1434/UDP: Used by the SQL Server Browser Service, which listens for incoming requests and redirects clients to the correct port/instance (especially for named instances). It's critical for discovering dynamic ports when 1433 isn't used.
1434/TCP: Less commonly highlighted but used in some configurations, such as dedicated admin connections (DAC) or when the Browser Service responds over TCP for specific instances. While 1433/TCP is the primary engine port, 1434/TCP can be involved in multi-instance setups.
Technical Details:
Ports can be customized (e.g., via SQL Server Configuration Manager), but these are defaults.
Named instances often use dynamic ports (allocated from the ephemeral range), with the Browser Service (1434/UDP) guiding clients to them.
Firewalls must allow these ports for MSSQL to function externally, posing risks if not secured (e.g., brute-force attacks on 1433/TCP).
Security Implications: CNSP likely covers MSSQL port security, as vulnerabilities like SQL Slammer (2003) exploited 1434/UDP misconfigurations. Hardening includes restricting access, changing defaults, and monitoring traffic.
Why other options are incorrect:
A . 1433/TCP, 2433/UDP, 3433/TCP: 2433/UDP and 3433/TCP are not MSSQL standards; they're likely typos or unrelated ports.
C . 1433/TCP, 2433/UDP, 1434/TCP: 2433/UDP is incorrect; 1434/UDP is the Browser Service port.
D . 1533/TCP, 1434/UDP, 2434/TCP: 1533/TCP and 2434/TCP aren't associated with MSSQL; they deviate from documented defaults.
Real-World Context: Tools like netstat -an | find "1433" on Windows confirm MSSQL's port usage during audits.
NEW QUESTION # 63
Which of the following files has the SGID permission set?
-rwxr-sr-x 1 root root 4096 Jan 1 08:00 myfile
-rwsr-xr-x 1 root root 4096 Jan 1 00:08 myprogram
-rw-r--r-s 1 root root 4896 Jan 1 00:00 anotherfile
- A. myprogram
- B. myfile
- C. All of the above
- D. anotherfile
Answer: B
Explanation:
In Linux, the SGID (Set Group ID) bit alters execution or directory behavior:
On executables: Runs with the group owner's permissions (e.g., s in group execute position).
On directories: New files inherit the directory's group ownership.
Notation: s in group execute field (e.g., -rwxr-sr-x), or S if no execute (e.g., -rwxr-Sr-x).
Analysis:
-rwxr-sr-x (myfile): User: rwx, Group: r-s (SGID), Others: r-x. The s in group execute confirms SGID.
-rwsr-xr-x (myprogram): User: rws (SUID), Group: r-x, Others: r-x. The s is in user execute, not group-no SGID.
-rw-r--r-s (anotherfile): User: rw-, Group: r--, Others: r-s. The s is in others execute, but no x exists, rendering it meaningless (not SGID; could be a typo or sticky bit misapplied).
Security Implications: SGID executables (e.g., /usr/bin/wall) or directories (e.g., /var/local) manage group access. Misuse risks privilege escalation. CNSP likely teaches auditing with find / -perm -g=s.
Why other options are incorrect:
B: SUID, not SGID.
C: No valid SGID; s in others is irrelevant without execute.
D: Only A has SGID.
Real-World Context: SGID on /var/mail ensures mail files inherit the mail group.
NEW QUESTION # 64
What is the response from a closed UDP port which is not behind a firewall?
- A. No response
- B. None of the above
- C. A RST packet
- D. ICMP message showing Destination Unreachable
Answer: D
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 # 65
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