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The SecOps Group Certified Network Security Practitioner Sample Questions (Q22-Q27):

NEW QUESTION # 22
What is the response from a closed TCP port which is behind a firewall?

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

Answer: B

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 # 23
The application is showing a TLS error message as a result of a website administrator failing to timely renew the TLS certificate. But upon deeper analysis, it appears that the problem is brought on by the expiration of the TLS certificate. Which of the following statements is correct?

• A. The communication between the browser and the server is now no longer over TLS.
• B. The communication between the browser and the server is still over TLS.

Answer: A

Explanation:
TLS (Transport Layer Security) secures communication (e.g., HTTPS) using certificates, per RFC 8446. A certificate includes:
Validity Period: Start and end dates (e.g., "Not After: March 8, 2025").
Purpose: Authenticates the server and encrypts the session.
Scenario: An expired TLS certificate (e.g., past "Not After" date). Modern browsers (e.g., Chrome, Firefox) validate certificates during the handshake:
ClientHello: Browser initiates TLS.
ServerHello: Server sends its certificate.
Validation: Browser checks expiration, CA trust, etc.
If expired, browsers reject the handshake, displaying errors (e.g., "NET::ERR_CERT_DATE_INVALID"). No session key is negotiated, and communication doesn't proceed over TLS. Users may bypass warnings (e.g., "Advanced > Proceed"), but this is unencrypted or uses a fallback (not standard TLS), breaking security guarantees.
Security Implications: Expired certificates expose sites to MITM attacks, as trust is lost. CNSP likely emphasizes certificate management (e.g., automation with Let's Encrypt) to avoid this.
Why other options are incorrect:
B . The communication is still over TLS: False; an expired certificate halts the TLS handshake in compliant browsers. Legacy systems might negotiate insecurely, but this isn't "TLS" per standards.
Real-World Context: The 2019 Equifax breach partially stemmed from expired certificates missing vulnerabilities.

NEW QUESTION # 24
Which of the following algorithms could be used to negotiate a shared encryption key?

• A. SHA1
• B. AES
• C. Diffie-Hellman
• D. Triple-DES

Answer: C

Explanation:
Negotiating a shared encryption key involves a process where two parties agree on a secret key over an insecure channel without directly transmitting it. This is distinct from encryption or hashing algorithms, which serve different purposes.
Why C is correct: The Diffie-Hellman (DH) algorithm is a key exchange protocol that enables two parties to establish a shared secret key using mathematical operations (e.g., modular exponentiation). It's widely used in protocols like TLS and IPsec, as noted in CNSP for secure key negotiation.
Why other options are incorrect:
A: Triple-DES is a symmetric encryption algorithm for data encryption, not key negotiation.
B: SHA1 is a hash function for integrity, not key exchange.
D: AES is a symmetric encryption algorithm, not a key exchange mechanism.

NEW QUESTION # 25
How would you establish a null session to a Windows host from a Windows command prompt?

• A. net use hostnamec$ "" /u:NULL
• B. net use hostnameipc$ "" /u:""
• C. net use hostnameipc$ "" /u:NULL
• D. net use hostnamec$ "" /u:""

Answer: B

Explanation:
A null session in Windows is an unauthenticated connection to certain administrative shares, historically used for system enumeration. The net use command connects to a share, and the IPC$ (Inter-Process Communication) share is the standard target for null sessions, allowing access without credentials when configured to permit it.
Why C is correct: The command net use \hostnameipc$ "" /u:"" specifies the IPC$ share and uses empty strings for the password (first "") and username (/u:""), establishing a null session. This syntax is correct for older Windows systems (e.g., XP or 2003) where null sessions were more permissive, a topic covered in CNSP for legacy system vulnerabilities.
Why other options are incorrect:
A: Targets the c$ share (not typically used for null sessions) and uses /u:NULL, which is invalid syntax; the username must be an empty string ("").
B: Targets c$ instead of ipc$, making it incorrect for null session establishment.
D: Uses ipc$ correctly but specifies /u:NULL, which is not the proper way to denote an empty username.

NEW QUESTION # 26
How many octets are there in an IPv6 address?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: C

Explanation:
An IPv6 address, defined in RFC 4291, is a 128-bit address designed to replace IPv4's 32-bit scheme, vastly expanding address space (2

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