H12-711_V4.0 Exam Dumps - Huawei HCIA-Security Questions and Answers

Explanation From HCIA-Security documents:

IKE-based SA establishment is designed to automate IPsec parameter negotiation and key management, which makes it especially suitable for environments where configuring many tunnels manually would be inefficient. That is why B is correct: IKE scales better for medium and large networks because it negotiates policies, authenticates peers, and builds SAs dynamically instead of relying on fixed, manually configured keys.

A is incorrect because Security Associations have lifetimes. Both IKE SAs and IPsec SAs are created with time-based and/or traffic-based lifetimes and must be refreshed or renegotiated when they expire to maintain security. Permanent SAs would increase risk because long-lived keys are more exposed to compromise.

C is correct : SPI is a 32-bit identifier used by the receiver to find the correct SA for inbound traffic, and it is typically chosen by the receiving side in a way that avoids collisions—commonly treated as randomly generated in foundational descriptions.

D is correct because IKE uses Diffie-Hellman to derive shared keying material securely over an untrusted network, and then refreshes keys by rekeying based on SA lifetime, achieving dynamic updates.

This statement is TRUE . When an administrator logs in to a device through the web UI over HTTPS , the device acts as the HTTPS server and presents a local certificate to the web browser during the TLS handshake. If this certificate is issued by a CA trusted by the browser , the browser can verify the certificate chain, confirm the identity of the device, and establish an encrypted session without certificate warning messages.

This process improves security in two important ways. First, it provides server identity authentication , which helps the administrator confirm that the browser is connected to the legitimate device rather than an impersonated or spoofed host. Second, once the certificate is trusted and the TLS session is established, the communication is encrypted and protected for integrity , which reduces the risk of eavesdropping, tampering, and man-in-the-middle attacks during administrator login.

If a trusted CA certificate is not used, administrators may see browser warnings and may not be able to reliably confirm the server identity. Therefore, configuring a CA-issued certificate for HTTPS management helps prevent malicious attacks and ensures more secure administrator access.

Explanation From HCIA-Security documents:

Huawei firewalls use security zones to classify interfaces and apply interzone access control and security policies. Some zones are predefined default zones that are built into the system to represent common network roles, such as Trust and Untrust. These default zones are foundational for typical deployments and are generally not allowed to be deleted, because many policy and security mechanisms rely on them as standard references.

In contrast, DMZ is commonly used as a semi-trusted zone for servers that must be reachable from the Internet while still being isolated from the internal network. On Huawei firewalls, DMZ is treated as a configurable zone: administrators can create it when needed, remove it when it is not required, and adjust its priority value so that zone-based matching and policy selection behave as intended in multi-zone deployments.

“ISP” is not a standard default security zone name in the typical Huawei firewall zone model presented at HCIA level. Therefore, among the options, DMZ is the zone that can be deleted and whose priority can be reconfigured.

Explanation From HCIA-Security documents:

A SYN flood attack exploits the TCP three-way handshake mechanism by sending a large number of SYN packets without completing the handshake, causing the server or firewall to maintain excessive half-open connections and exhaust resources. Huawei firewalls provide multiple defense mechanisms at the TCP protocol level to mitigate this threat.

First, limiting the TCP connection establishment rate restricts how many new SYN requests are processed per second, preventing abnormal surges from consuming system resources. Second, limiting the number of half-open TCP connections ensures that the firewall does not allocate excessive memory and session table entries for incomplete handshakes, thereby protecting against resource exhaustion. Third, SYN cookie technology allows the firewall to avoid storing connection state information until the handshake is properly completed, effectively resisting SYN flood attacks without consuming large amounts of memory.

Interzone security policies primarily control traffic access based on zones and rules; they are not specifically designed as a SYN flood defense mechanism. Therefore, A, B, and C are correct.

The correct operation is D because email attachments are a common carrier for malware, phishing payloads, ransomware, Trojans, and malicious scripts. In enterprise security practice, a user should not trust an attachment only because the message looks work-related or appears to come from a company mailbox . Attackers can spoof sender information, disguise malicious content, or compromise legitimate accounts. Therefore, simply checking the content or sender is not enough to ensure safety.

A safer process is to verify the sender and the email details carefully , such as the address, subject, wording, unexpected urgency, and whether the attachment type matches the business context. After that, the attachment should be scanned with antivirus or endpoint security software before opening or saving it. This helps detect known malicious files and reduces the chance of infecting the host or internal network.

Option A is unsafe because work relevance alone does not prove the file is harmless. B is clearly wrong because attachments can directly affect information security. C is also unsafe because internal-looking mail can still be malicious. Therefore, D is the correct answer.