NEW THE SECOPS GROUP CNSP TEST FORUM - CNSP RELIABLE TEST CAMP

New The SecOps Group CNSP Test Forum - CNSP Reliable Test Camp

New The SecOps Group CNSP Test Forum - CNSP Reliable Test Camp

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The SecOps Group Certified Network Security Practitioner Sample Questions (Q28-Q33):

NEW QUESTION # 28
What is the response from a closed TCP port which is behind a firewall?

  • A. A FIN and an ACK packet
  • B. RST and an ACK packet
  • C. A SYN and an ACK packet
  • D. No response

Answer: D

Explanation:
TCP (Transmission Control Protocol) uses a three-way handshake (SYN, SYN-ACK, ACK) to establish connections, as per RFC 793. When a client sends a SYN packet to a port:
Open Port: The server responds with SYN-ACK.
Closed Port (no firewall): The server sends an RST (Reset) packet, often with ACK, to terminate the attempt immediately.
However, when a firewall is present, its configuration dictates the response. Modern firewalls typically operate in stealth mode, using a "drop" rule for closed ports rather than a "reject" rule:
Drop: Silently discards the packet without replying, resulting in no response. The client experiences a timeout (e.g., 30 seconds), as no feedback is provided.
Reject: Sends an RST or ICMP "Port Unreachable," but this is less common for security reasons, as it confirms the firewall's presence.
For a closed TCP port behind a firewall, "no response" (drop) is the standard behavior in secure configurations, minimizing information leakage to attackers. This aligns with CNSP's focus on firewall best practices to obscure network topology during port scanning (e.g., with Nmap).
Why other options are incorrect:
A . A FIN and an ACK packet: FIN-ACK is used to close an established TCP connection gracefully (e.g., after data transfer), not to respond to an initial SYN on a closed port.
B . RST and an ACK packet: RST-ACK is the host's response to a closed port without a firewall. A firewall's drop rule overrides this by silently discarding the packet.
C . A SYN and an ACK packet: SYN-ACK indicates an open port accepting a connection, the opposite of a closed port scenario.
Real-World Context: Tools like Nmap interpret "no response" as "filtered" (firewall likely present) vs. "closed" (RST received), aiding in firewall detection.


NEW QUESTION # 29
What ports does an MSSQL server typically use?

  • A. 1433/TCP, 2433/UDP, and 1434/TCP
  • B. 1433/TCP, 1434/UDP, and 1434/TCP
  • C. 1433/TCP, 2433/UDP, and 3433/TCP
  • D. 1533/TCP, 1434/UDP, and 2434/TCP

Answer: B

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 # 30
In a Linux-based architecture, what does the /mnt directory contain?

  • A. System configuration files and initialization scripts
  • B. Temporary-mounted filesystems
  • C. Loadable driver modules needed to boot the system
  • D. System files which represent the current state of the kernel

Answer: B

Explanation:
The Linux Filesystem Hierarchy Standard (FHS), per FHS 3.0, defines directory purposes:
/mnt: Designated for temporarily mounted filesystems, typically by system administrators.
Use: Mount points for removable media (e.g., USB drives: mount /dev/sdb1 /mnt/usb) or network shares (e.g., NFS).
Nature: Transient, user-managed, not persistent across reboots (unlike /etc/fstab mounts).
Contrast:
/media: Auto-mounts removable devices (e.g., by desktop environments like GNOME).
/mnt vs. /media: /mnt is manual, /media is system-driven.
Technical Details:
Empty by default; subdirectories (e.g., /mnt/usb) are created as needed.
Permissions: Typically root-owned (0755), requiring sudo for mounts.
Security Implications: Misconfigured /mnt mounts (e.g., world-writable) risk unauthorized access. CNSP likely covers mount security (e.g., nosuid option).
Why other options are incorrect:
B . System config/init scripts: Found in /etc (e.g., /etc/passwd, /etc/init.d).
C . Driver modules: Located in /lib/modules/<kernel-version>.
D . Kernel state: Resides in /proc (e.g., /proc/cpuinfo).
Real-World Context: Admins mount ISOs at /mnt during server provisioning (e.g., mount -o loop image.iso /mnt).


NEW QUESTION # 31
Which of the following is a valid DNS record type?

  • A. All of the above
  • B. NAPTR record
  • C. SRV record
  • D. TXT record

Answer: A

Explanation:
DNS (Domain Name System) records define how domain names are mapped to various types of data, each serving a specific purpose in network operations. The question asks for valid DNS record types, and all listed options are recognized.
Why D is correct:
A . NAPTR record: The Naming Authority Pointer (NAPTR) record is used for service discovery and mapping domain names to services, protocols, and ports (e.g., in SIP or ENUM systems).
B . SRV record: The Service (SRV) record specifies the hostname and port for specific services (e.g., LDAP, XMPP), aiding in service location.
C . TXT record: The Text (TXT) record stores arbitrary text data, often for SPF, DKIM, or domain verification.
All are valid DNS record types per RFC standards and CNSP documentation, making "All of the above" the correct answer.
Why other options are incomplete: A, B, or C alone exclude other valid types listed, so D is the most comprehensive response.


NEW QUESTION # 32
Which built-in Windows utility can be used to verify the validity of a Kerberos ticket?

  • A. Netsh
  • B. Klist
  • C. Kerberos Manager
  • D. Kerbtray

Answer: B

Explanation:
Kerberos is the default authentication protocol in Windows Active Directory environments, and tickets are used to prove identity. Verifying ticket validity involves checking their status, expiration, and attributes, which requires a built-in tool available in modern Windows systems.
Why A is correct: Klist is a command-line utility included in Windows (since Vista/2008) that lists cached Kerberos tickets and their details, such as validity period and renewal status. CNSP recognizes it as the standard tool for Kerberos ticket management in security audits.
Why other options are incorrect:
B: Kerbtray is a graphical tool from the Windows Resource Kit, not a built-in utility, and is outdated.
C: Netsh manages network configurations, not Kerberos tickets.
D: "Kerberos Manager" is not a recognized built-in Windows utility; it's a fictitious name.


NEW QUESTION # 33
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