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The SecOps Group Certified Network Security Practitioner Sample Questions (Q55-Q60):

NEW QUESTION # 55
Which of the following services use TCP protocol?

A. HTTP
B. IKE
C. SNMP
D. NTP

Answer: A

Explanation:
TCP (Transmission Control Protocol) ensures reliable, ordered data delivery via a connection-oriented handshake, contrasting with UDP's lightweight, connectionless approach. Analyzing each service:
C . HTTP (Hypertext Transfer Protocol): Uses TCP (port 80) for web traffic. TCP's reliability ensures HTML, images, etc., arrive intact. HTTPS (TCP 443) extends this with TLS. RFC 2616 mandates TCP.
A . SNMP (Simple Network Management Protocol): Defaults to UDP (port 161) for monitoring devices. UDP's speed suits its lightweight queries, though TCP variants exist (rarely used).
B . NTP (Network Time Protocol): Uses UDP (port 123) per RFC 5905. UDP minimizes latency for time sync, tolerating occasional packet loss.
D . IKE (Internet Key Exchange): Part of IPsec, uses UDP (port 500) per RFC 7296. UDP suits its negotiation phase; TCP isn't standard.
Security Implications: TCP services like HTTP are more prone to state-based attacks (e.g., SYN floods) than UDP counterparts. CNSP likely contrasts TCP vs. UDP in protocol analysis.
Why other options are incorrect:
A, B, D: All default to UDP for efficiency, not TCP's reliability.
Real-World Context: Firewalls prioritize TCP 80/443 rules for HTTP/HTTPS, while UDP 123 is opened for NTP servers.

NEW QUESTION # 56
Which of the following attacks are associated with an ICMP protocol?

A. Ping of death
B. Smurf attack
C. All of the following
D. ICMP flooding

Answer: C

Explanation:
ICMP (Internet Control Message Protocol), per RFC 792, handles diagnostics (e.g., ping) and errors in IP networks. It's exploitable in:
A . Ping of Death:
Method: Sends oversized ICMP Echo Request packets (>65,535 bytes) via fragmentation. Reassembly overflows buffers, crashing older systems (e.g., Windows 95).
Fix: Modern OSes cap packet size (e.g., ping -s 65500).
B . Smurf Attack:
Method: Spoofs ICMP Echo Requests to a network's broadcast address (e.g., 192.168.255.255). All hosts reply, flooding the victim.
Amplification: 100 hosts = 100x traffic.
C . ICMP Flooding:
Method: Overwhelms a target with ICMP Echo Requests (e.g., ping -f), consuming bandwidth/CPU.
Variant: BlackNurse attack targets firewalls.
Technical Details:
ICMP Type 8 (Echo Request), Type 0 (Echo Reply) are key.
Mitigation: Rate-limit ICMP, disable broadcasts (e.g., no ip directed-broadcast).
Security Implications: ICMP attacks are DoS vectors. CNSP likely teaches filtering (e.g., iptables -p icmp -j DROP) balanced with diagnostics need.
Why other options are incorrect:
A, B, C individually: All are ICMP-based; D is comprehensive.
Real-World Context: Smurf attacks peaked in the 1990s; modern routers block them by default.

NEW QUESTION # 57
Which of the following is not a DDoS attack?

A. NTP Amplification
B. SYN Flood
C. UDP Flood
D. Brute Force

Answer: D

Explanation:
DDoS (Distributed Denial of Service) attacks aim to overwhelm a target's resources with excessive traffic, disrupting availability, whereas other attack types target different goals.
Why D is correct: Brute force attacks focus on guessing credentials (e.g., passwords) to gain unauthorized access, not on denying service. CNSP classifies it as an authentication attack, not a DDoS method.
Why other options are incorrect:
A: SYN Flood exhausts TCP connection resources, a classic DDoS attack.
B: NTP Amplification leverages amplified responses to flood targets, a DDoS technique.
C: UDP Flood overwhelms a system with UDP packets, another DDoS method.

NEW QUESTION # 58
An 'EICAR' file can be used to?

A. Test the encryption algorithms
B. Test the response of an antivirus program

Answer: B

Explanation:
The EICAR test file is a standardized tool in security testing, designed for a specific purpose.
Why A is correct: The EICAR file (a 68-byte string) triggers antivirus detection without harm, testing response capabilities. CNSP recommends it for AV validation.
Why B is incorrect: It has no role in testing encryption; it's solely for AV functionality.

NEW QUESTION # 59
What ports does an MSSQL server typically use?

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

Answer: C

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 # 60
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The SecOps Group Certified Network Security Practitioner Sample Questions (Q55-Q60):

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