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CNSP - Newest Updated Certified Network Security Practitioner CBT

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The SecOps Group Certified Network Security Practitioner Sample Questions (Q51-Q56):

NEW QUESTION # 51
What ports can be queried to perform a DNS zone transfer?

A. Both 1 and 2
B. 53/UDP
C. None of the above
D. 53/TCP

Answer: D

Explanation:
A DNS zone transfer involves replicating the DNS zone data (e.g., all records for a domain) from a primary to a secondary DNS server, requiring a reliable transport mechanism.
Why A is correct: DNS zone transfers use TCP port 53 because TCP ensures reliable, ordered delivery of data, which is critical for transferring large zone files. CNSP notes that TCP is the standard protocol for zone transfers (e.g., AXFR requests), as specified in RFC 5936.
Why other options are incorrect:
B . 53/UDP: UDP port 53 is used for standard DNS queries and responses due to its speed and lower overhead, but it is not suitable for zone transfers, which require reliability over speed.
C . Both 1 and 2: This is incorrect because zone transfers are exclusively TCP-based, not UDP-based.
D . None of the above: Incorrect, as 53/TCP is the correct port for DNS zone transfers.

NEW QUESTION # 52
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. 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.
B. None of the above.
C. Both A and B.
D. 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.

Answer: D

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 # 53
What is the response from a closed TCP port which is not behind a firewall?

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

Answer: A

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 # 54
Which of the following algorithms could be used to negotiate a shared encryption key?

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

Answer: B

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 # 55
You are performing a security audit on a company's infrastructure and have discovered that the domain name system (DNS) server is vulnerable to a DNS cache poisoning attack. What is the primary security risk?

A. The primary risk is that an attacker could manipulate the cache of the web server or proxy server to return incorrect content for a specific URL or web page.
B. The primary risk is that an attacker could redirect traffic to a malicious website and steal sensitive information.

Answer: B

Explanation:
DNS cache poisoning, also known as DNS spoofing, involves an attacker injecting false DNS records into a resolver's cache, altering how domain names resolve.
Why A is correct: The primary risk is that an attacker can redirect users to malicious websites (e.g., phishing or malware sites) by poisoning the DNS cache with fake IP addresses. This can lead to credential theft, data exfiltration, or malware distribution. CNSP identifies this as the core threat of DNS cache poisoning, aligning with real-world attack vectors.
Why other option is incorrect:
B . Manipulate the cache of the web server or proxy server: This describes web cache poisoning, a different attack targeting HTTP caches, not DNS servers. DNS cache poisoning affects DNS resolution, not web or proxy server caches directly.

NEW QUESTION # 56
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