Exactprep H12-821_V1.0 Questions

A stateful inspection firewall tracks the state of network connections and only matches the initial packet against its rule set. Subsequent packets in the same connection are matched in the state table. Contrary to this, UDP packets can be inspected by correlating them with connection states, and packets in a single connection are always correlated ​.

Comprehensive and Detailed In-Depth Explanation:

A. TRUE → If preemption is enabled, a higher-priority router can take over as the Master.

B. TRUE → If preemption is disabled, the current Master remains active even if a higher-priority router joins.

C. TRUE → The Master router sends VRRP Advertisement packets to maintain its role.

D. FALSE → If a VRRP router is the IP address owner, it automatically becomes the Master without needing to participate in an election.

???? Reference: Huawei HCIA-Datacom Study Guide, VRRP Priority and Preemption Mechanisms.

By default, Huawei firewalls create security zones such as Trust, Untrust, and Local. The DMZ (Demilitarized Zone) is a security zone explicitly created by users. A DMZ is used to isolate an internal network from the external one, providing an additional layer of security by placing public-facing services (e.g., web servers) in this intermediary zone. This setup ensures that if a public-facing service is compromised, the internal network remains secure. Huawei Firewall configuration steps confirm this zoning principle, making DMZ creation an explicit user-driven action ​.

 In asynchronous mode, BFD control packets are exchanged periodically to detect faults.

 In demand mode, once the session is established, BFD stops sending periodic control packets and relies on external mechanisms to verify connectivity.

 Asynchronous mode is the most commonly used mode. However, the Echo function is supported in asynchronous mode, making Option B incorrect ​.