RELIABLE CNSP EXAM MATERIALS & RELIABLE CNSP GUIDE FILES

Reliable CNSP Exam Materials & Reliable CNSP Guide Files

Reliable CNSP Exam Materials & Reliable CNSP Guide Files

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The SecOps Group Certified Network Security Practitioner Sample Questions (Q58-Q63):

NEW QUESTION # 58
You are performing a security audit on a company's network infrastructure and have discovered the SNMP community string set to the default value of "public" on several devices. What security risks could this pose, and how might you exploit it?

  • A. None of the above.
  • B. The potential risk is that an attacker could use the SNMP protocol to modify the devices' configuration settings. You might use a tool like Snmpset to change the settings.
  • C. The potential risk is that an attacker could use the SNMP protocol to gather sensitive information about the devices. You might use a tool like Snmpwalk to query the devices for information.
  • D. Both A and B.

Answer: C

Explanation:
SNMP (Simple Network Management Protocol) uses community strings as a basic form of authentication. The default read-only community string "public" is widely known, and if left unchanged, it exposes devices to unauthorized access. The primary risk with "public" is information disclosure, as it typically grants read-only access, allowing attackers to gather sensitive data (e.g., device configurations, network topology) without altering settings.
Why A is correct: With the "public" string, an attacker can use tools like snmpwalk to enumerate device details (e.g., system uptime, interfaces, or software versions) via SNMP queries. This aligns with CNSP's focus on reconnaissance risks during security audits, emphasizing the danger of default credentials enabling passive data collection.
Why other options are incorrect:
B: While modifying settings is a risk with SNMP, the default "public" string is typically read-only. Changing configurations requires a read-write community string (e.g., "private"), which isn't implied here. Thus, snmpset would not work with "public" alone.
C: Since B is incorrect in this context, C (both A and B) cannot be the answer.
D: The risk in A is valid, so "none of the above" is incorrect.


NEW QUESTION # 59
What is the response from a closed TCP port which is not behind a firewall?

  • A. A FIN and an ACK packet
  • B. ICMP message showing Port Unreachable
  • C. A RST and an ACK packet
  • D. A SYN and an ACK packet

Answer: C

Explanation:
TCP uses a structured handshake, and its response to a connection attempt on a closed port follows a specific protocol when unobstructed by a firewall.
Why C is correct: A closed TCP port responds with a RST (Reset) and ACK (Acknowledgment) packet to terminate the connection attempt immediately. CNSP highlights this as a key scanning indicator.
Why other options are incorrect:
A: ICMP Port Unreachable is for UDP, not TCP.
B: FIN/ACK is for closing active connections, not rejecting new ones.
D: SYN/ACK indicates an open port during the TCP handshake.


NEW QUESTION # 60
The Management Information Base (MIB) is a collection of object groups that is managed by which service?

  • A. NTP
  • B. SNMP
  • C. SMTP
  • D. TACACS

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 # 61
Which of the aforementioned SSL/TLS protocols are considered to be unsafe?

  • A. Both A and B
  • B. TLSv1.0 and TLSv1.1
  • C. SSLv2 and SSLv3
  • D. SSLv2, SSLv3, TLSv1.0, TLSv1.1, TLSv1.2, and TLSv1.3

Answer: A

Explanation:
SSL/TLS protocols secure network communication, but older versions have vulnerabilities:
SSLv2 (1995): Weak ciphers, no handshake integrity (e.g., MITM via DROWN attack, CVE-2016-0800). Deprecated by RFC 6176 (2011).
SSLv3 (1996): Vulnerable to POODLE (CVE-2014-3566), weak block ciphers (e.g., RC4). Deprecated by RFC 7568 (2015).
TLSv1.0 (1999, RFC 2246): Inherits SSLv3 flaws (e.g., BEAST, CVE-2011-3389), weak CBC ciphers. Deprecated by PCI DSS (2018) and RFC 8996 (2021).
TLSv1.1 (2006, RFC 4346): Improved over 1.0 but lacks modern cipher suites (e.g., AEAD). Deprecated with 1.0 by RFC 8996.
TLSv1.2 (2008, RFC 5246): Secure with strong ciphers (e.g., AES-GCM), widely used today.
TLSv1.3 (2018, RFC 8446): Latest, removes legacy weaknesses, mandatory forward secrecy.
Why other options are incorrect:
A: Correct but incomplete without B.
B: Correct but incomplete without A.
D: Incorrectly includes TLSv1.2 and 1.3, which are secure and recommended.
Real-World Context: POODLE forced mass SSLv3 disablement in 2014; TLS 1.0/1.1 deprecation hit legacy systems in 2021.


NEW QUESTION # 62
In the context of the SSH (Secure Shell) public-private key authentication mechanism, which key is uploaded to the server and which key is used by the end-user for authentication?

  • A. The private key is uploaded to the server and the public key is used by the end user for authentication.
  • B. The public key is uploaded to the server and the private key is used by the end user for authentication.

Answer: B

Explanation:
SSH (Secure Shell), per RFC 4251, uses asymmetric cryptography (e.g., RSA, ECDSA) for secure authentication:
Key Pair:
Public Key: Freely shareable, used to encrypt or verify.
Private Key: Secret, used to decrypt or sign.
Process:
User generates a key pair (e.g., ssh-keygen -t rsa -b 4096).
Public Key is uploaded to the server, appended to ~/.ssh/authorized_keys (e.g., via ssh-copy-id).
Private Key (e.g., ~/.ssh/id_rsa) stays on the user's machine.
Authentication: Client signs a challenge with the private key; server verifies it with the public key.
Technical Details:
Protocol: SSH-2 (RFC 4253) uses a Diffie-Hellman key exchange, then public-key auth.
Files: authorized_keys (server, 0644 perms), private key (client, 0600 perms).
Security: Private key exposure compromises all systems trusting the public key.
Security Implications: CNSP likely stresses key management (e.g., passphrases, rotation) and server-side authorized_keys hardening (e.g., PermitRootLogin no).
Why other options are incorrect:
B: Uploading the private key reverses the model, breaking security-anyone with the server's copy could authenticate as the user. Asymmetric copyright relies on the private key remaining secret.
Real-World Context: GitHub uses SSH public keys for repository access, with private keys on user devices.


NEW QUESTION # 63
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