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NEW QUESTION # 31
What is the response from an open UDP port which is behind a firewall (port is open on the firewall)?
Answer: D
Explanation:
UDP (User Datagram Protocol), per RFC 768, is connectionless, lacking TCP's handshake or acknowledgment mechanisms. When a UDP packet reaches a port:
Closed Port: The host typically sends an ICMP "Destination Port Unreachable" (Type 3, Code 3) unless suppressed (e.g., by firewall or OS settings).
Open Port: If a service is listening (e.g., DNS on 53/UDP), it processes the packet but doesn't inherently reply unless the application protocol requires it (e.g., DNS sends a response).
Scenario: An open UDP port behind a firewall, with the firewall rule allowing traffic (e.g., permit udp any host 10.0.0.1 eq 123). The packet reaches the service, but UDP itself doesn't mandate a response. Most services (e.g., NTP, SNMP) only reply if the packet matches an expected request. In this question's generic context (no specific service), no response is the default, as the firewall permits the packet, and the open port silently accepts it without feedback.
Security Implications: This silence makes UDP ports harder to scan (e.g., Nmap assumes "open|filtered" for no response), but exposed open ports risk amplification attacks (e.g., DNS reflection). CNSP likely contrasts UDP's behavior with TCP for firewall rule crafting.
Why other options are incorrect:
A . ICMP message showing Port Unreachable: Occurs for closed ports, not open ones, unless the service explicitly rejects the packet (rare).
C . A SYN Packet: SYN is TCP-specific (handshake initiation), irrelevant to UDP.
D . A FIN Packet: FIN is TCP-specific (connection closure), not UDP.
Real-World Context: Testing UDP 53 (DNS) with dig @8.8.8.8 +udp yields a response, but generic UDP probes (e.g., nc -u) often get silence.
NEW QUESTION # 32
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?
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 # 33
Which one of the following is not an online attack?
Answer: A
Explanation:
Online attacks require real-time interaction with a target system (e.g., a login interface), whereas offline attacks occur without direct system interaction, typically after obtaining data like password hashes. A rainbow table attack is an offline method that uses precomputed tables of hash values to reverse-engineer passwords from stolen hash databases, distinguishing it from the other options, which are online.
Why B is correct: Rainbow table attacks are performed offline after an attacker has already acquired a hash (e.g., from a compromised database). The attacker matches the hash against precomputed tables to find the plaintext password, requiring no interaction with the target system during the attack. CNSP classifies this as an offline password recovery technique.
Why other options are incorrect:
A: Brute force attacks involve repeatedly submitting password guesses to a live system (e.g., via SSH or a web login), making it an online attack.
C: Password spraying attacks test a few common passwords across many accounts on a live system, also an online attack aimed at avoiding lockouts.
D: Phishing attacks trick users into submitting credentials through fake interfaces (e.g., emails or websites), requiring real-time interaction and thus classified as online.
NEW QUESTION # 34
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?
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 # 35
What ports does an MSSQL server typically use?
Answer: D
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 # 36
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