Huawei HCIA-Security V4.0 Exam H12-711_V4.0 Exam Dumps: Updated Questions & Answers (April 2026)

Explanation From HCIA-Security documents:

PKI is mainly used where digital certificates are needed to prove identity, distribute public keys safely, and support functions such as authentication, encryption, and digital signatures . HTTPS web login relies on server certificates (and sometimes client certificates) to build trust and establish encrypted sessions, so D is a classic PKI scenario. SSL VPN also typically uses certificates for gateway identity and often for user/device authentication, so A fits PKI usage as well. IPv6 SEND Secure Neighbor Discovery uses cryptographic mechanisms (such as CGA and signature-based protection) that depend on certificates, making C another PKI-related scenario.

By contrast, IPsec VPN does not necessarily depend on PKI in all deployments. IPsec can authenticate peers using pre-shared keys or other methods without certificates, so it is commonly treated as not strictly a PKI application scenario in basic classification questions. In many training outlines, PKI scenarios are highlighted as HTTPS, SSL VPN, and IPv6 SEND, while IPsec is presented as a separate VPN technology that may or may not integrate certificates. Therefore, the best answer is B .

Explanation From HCIA-Security documents:

The statement is incorrect for two reasons. First, in asymmetric cryptography, encryption and decryption are not restricted to only “public encrypt, private decrypt.” That is one common confidentiality use case (for example, encrypting a session key so only the holder of the matching private key can recover it). However, asymmetric key pairs are also used the other way around for digital signatures : the sender uses the private key to generate a signature (often described conceptually as “private-key operation”), and others use the public key to verify it. So it’s not true that “only public keys can be used to encrypt data” in all cases or contexts.

Second, calling the process “irreversible” is misleading. Asymmetric encryption is designed to be reversible for authorized parties : ciphertext can be decrypted with the corresponding key (private key for public-key encryption). What is “one-way” is the practical difficulty of recovering the plaintext without the correct key. Therefore, the correct choice is FALSE .

Explanation From HCIA-Security documents:

On Huawei firewalls, security protection whitelist rules are used to exclude specific traffic objects (such as certain URLs, domains, or application-identification strings, depending on the feature) from being blocked or inspected by security protection mechanisms. To avoid overly broad exemptions, the whitelist provides clear, controllable string matching modes. Commonly supported modes include prefix matching (the protected object begins with the specified string), suffix matching (the protected object ends with the specified string), and keyword matching (the protected object contains the specified keyword). These modes are deterministic and easy to validate, which helps administrators precisely exempt expected legitimate traffic while reducing the risk of accidentally whitelisting unrelated malicious traffic.

“Fuzzy matching” is not used as a whitelist matching mode because it is inherently ambiguous and may cause unintended matches. In security whitelisting, ambiguous matching would weaken protection by making the exemption scope unpredictable. Therefore, among the options provided, fuzzy matching is the one that is not a supported whitelist matching mode.