20+ practice questions focused on Network Security Controls Protocols And Devices — one of the most tested topics on the EC-Council Certified Network Defender (CND, 312-38, Blueprint v4.0) (CND) exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Network Security Controls Protocols And Devices PracticeA security analyst is troubleshooting an IPsec site-to-site VPN tunnel failure on a Linux-based StrongSwan gateway. The logs indicate an 'ESP packet decryption failed' error. Upon reviewing the security association parameters, the analyst notices a mismatch in the cryptographic checksum algorithm. Which IPsec protocol component is responsible for providing data integrity and authentication for the inner packet?
Explanation: ESP (Encapsulating Security Payload) provides confidentiality, data integrity, and authentication for the inner packet — its integrity check value (ICV) is computed using the negotiated authentication algorithm (e.g., HMAC-SHA256). A mismatch in that checksum algorithm between peers causes the receiver to fail ICV verification, producing the 'ESP packet decryption failed' error.
An organization is configuring an IPsec VPN tunnel between two branch offices using Cisco IOS routers. The engineering team requires the use of a secure key exchange method that provides perfect forward secrecy (PFS) during the Phase 1 Internet Key Exchange (IKEv1) negotiation. Which Phase 1 mode must be selected?
Explanation: Main Mode in IKEv1 protects the identity of the peers and uses Diffie-Hellman exchanges to derive keying material, which ensures Perfect Forward Secrecy (PFS) for the phase 2 keys derived from it. Aggressive Mode does not protect peer identities.
A security engineer is configuring a stateful inspection firewall and needs to handle incoming traffic for an active FTP data connection operating in passive mode. What specific challenge does passive FTP present to the firewall, and how does the firewall resolve it?
Explanation: In passive FTP, the client initiates the control connection to the server on port 21, but then the server opens a random high port and tells the client to connect to it for data transfer. This reverses the typical client-server data connection direction, so a stateful firewall that only allows inbound traffic for established connections will block the server's incoming connection attempt. An Application Layer Gateway (ALG) inspects the FTP control channel, extracts the dynamic port number, and temporarily opens that port to permit the data connection, maintaining security while enabling passive FTP.
A company is implementing a next-generation firewall (NGFW) and wants to inspect encrypted HTTPS traffic traversing the network without triggering browser certificate warning errors on corporate-managed endpoints. Which deployment method achieves this?
Explanation: SSL/TLS inspection (forward proxy decryption) works by having the firewall terminate the client's TLS session, inspect the plaintext, then re-encrypt to the destination server. For managed endpoints to trust the firewall's dynamically generated certificates without browser warnings, the firewall's CA certificate must be installed in each endpoint's Trusted Root store — typically pushed via Group Policy or MDM. An internal Enterprise CA-signed certificate is the cleanest approach because it chains to an already-trusted root.
A security administrator is hardening a network switch against VLAN hopping attacks. Which two configuration steps must be implemented on all user-facing access ports to neutralize this threat?
Explanation: To prevent VLAN hopping via switch spoofing and double tagging, user access ports must be explicitly configured as non-trunking (access ports) and the native VLAN on trunks should be changed from the default VLAN 1.
+15 more Network Security Controls Protocols And Devices questions available
Practice all Network Security Controls Protocols And Devices questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Network Security Controls Protocols And Devices. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Network Security Controls Protocols And Devices questions on the CND frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Network Security Controls Protocols And Devices is tested as part of the EC-Council Certified Network Defender (CND, 312-38, Blueprint v4.0) (CND) blueprint. Practicing with targeted Network Security Controls Protocols And Devices questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free CND practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but Network Security Controls Protocols And Devices is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
Launch a full Network Security Controls Protocols And Devices practice session with instant scoring and detailed explanations.
Start Network Security Controls Protocols And Devices Practice →