Pass the Huawei HCIA-Security H12-711_V4.0 Questions and answers with ValidTests

Explanation From HCIA-Security documents:

In IKEv1 Phase 1 aggressive mode, the negotiation completes in three messages, unlike main mode which uses six.

Message 1 (Initiator → Responder): Contains the IKE proposal, Diffie-Hellman public value, nonce, and the initiator’s identity information.

Message 2 (Responder → Initiator): Returns the selected proposal, responder’s Diffie-Hellman public value, nonce, identity information, and authentication data. At this stage, the initiator can authenticate the responder.

Message 3 (Initiator → Responder): Carries the initiator’s authentication data, allowing the responder to verify and authenticate the initiator.

Therefore, the primary function of message 3 is to provide authentication information so that the responder can confirm the identity of the initiator.

Options A and B correspond to earlier negotiation steps, and C describes part of message 2. Hence, the correct answer is D.

The correct answer is D . In Single Sign-On deployment on Huawei firewalls, the firewall commonly acts as the access control enforcement point , while the actual user authentication is performed by an external or third-party authentication server, such as an LDAP, RADIUS, or other identity system. In this process, the user may enter credentials through the firewall’s Portal page, but the firewall forwards the authentication information to the authentication server rather than locally storing and validating the password itself.

Option A is incorrect because SSO is not based on the firewall storing passwords and independently authenticating users. Option B is also incorrect because it describes a model where the firewall merely records identity and does not participate, while in practice the firewall participates in the access control and authentication interaction workflow. Option C describes an SMS-style verification process, which is not the essential mechanism being tested for SSO here.

Therefore, the correct SSO description is that the firewall receives the credentials, forwards them to a third-party authentication server, and the actual authentication is completed on that server.

Explanation From HCIA-Security documents:

In ESP transport mode, the authentication function provides data integrity and origin authentication for specific parts of the IP packet. The authentication calculation covers the ESP header, TCP/UDP header, user data, and ESP tail (including padding, Pad Length, and Next Header fields) . However, it does not include the outer IP header, because some IP header fields (such as TTL) may change during packet forwarding. It also does not include the ESP Authentication Data field itself, since that field stores the integrity check value result of the calculation.

In the diagram, range 3 correctly represents the portion starting from the ESP header up to the ESP tail, excluding the IP header and excluding the ESP Authentication Data field.

Range 1 only covers part of the payload, range 2 does not include the ESP header, and range 4 incorrectly includes the IP header. Therefore, option 3 accurately describes the authentication scope of ESP in transport mode.