Huawei H12-711_V4.0 - HCIA-Security V4.0 Exam

Explanation From HCIA-Security documents:

PKI is designed to solve trust and security problems in digital communications by using certificates, public/private keys, and signature mechanisms. It helps parties verify each other’s identities through certificate-based authentication, so B is a classic problem PKI addresses. PKI also enables secure key distribution and supports security protocols that provide confidentiality and integrity , which helps protect data against eavesdropping and tampering during transmission, so C is also within PKI’s scope. In addition, PKI supports digital signatures and non-repudiation-style evidence, which can replace or supplement paper receipts by creating verifiable transaction records, making D something PKI can help with in electronic transactions.

However, network congestion and service degradation due to heavy traffic (A) is a performance and capacity issue. PKI does not reduce traffic load, increase bandwidth, optimize routing, or fix server resource bottlenecks. Those problems are handled through network engineering measures such as QoS, scaling, load balancing, and capacity planning—not by PKI. Therefore, the correct answer is A .

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 .

In Huawei firewall hot standby, the heartbeat link is mainly used to maintain the backup relationship and monitor peer status. Through this link, the two firewalls periodically exchange heartbeat packets to confirm whether the peer device is alive and operating normally. This makes statement B correct. The heartbeat link also carries VGMP-related packets , which help the devices determine their active or standby roles and decide whether a switchover is necessary when faults or status changes occur. Therefore, statement C is also correct.

In addition, the firewalls can exchange configuration consistency check information to verify whether key configurations on both devices match, so statement D is correct as well.

The incorrect statement is A . Configuration and status synchronization between hot standby firewalls is not described simply as heartbeat packets being used to synchronize configuration commands and status information. Heartbeat packets are mainly for liveness detection and status maintenance , while configuration or session synchronization is handled by dedicated hot standby synchronization mechanisms rather than ordinary heartbeat packets themselves. Therefore, A is the incorrect statement.