H12-821_V1.0 Exam Dumps - Huawei HCIP-Datacom Questions and Answers

Wi-Fi 6 corresponds to the IEEE 802.11ax standard. It offers improved efficiency, higher data rates, and better performance in dense environments compared to its predecessors like 802.11ac (Wi-Fi 5) and 802.11n (Wi-Fi 4) ​.

Understanding DHCPv6 :

DHCPv6 (Dynamic Host Configuration Protocol for IPv6) is used to assign configuration parameters to IPv6 clients.

It supports both stateful and stateless modes:

Stateful : Assigns IPv6 addresses and other configuration parameters.

Stateless : Assigns only configuration parameters (e.g., DNS server) without providing IPv6 addresses.

Understanding the Network Setup:

The OSPF network consists of three areas (Area 1, Area 0, and Area 2).

The server ' s subnet 192.168.1.0/24 is directly connected to R1 and imported into OSPF using the command:

import-route direct type 1 cost 2

The type 1 specifies the route as an OSPF Type 1 external route , meaning both the external cost and the internal OSPF cost will be included when calculating the total cost.

The external cost specified for the imported route is 2 .

Cost Calculation to R2:

The interfaces between the routers are GE interfaces, and the default cost for GE interfaces is 1 .

The path from R2 to the server goes through the following hops:

R2 → R1: Cost = 1 (intra-area link).

R1 → Server: External cost = 2 (specified in the import-route command).

Total cost to R2:

Intra-area cost (1) + External cost (2) = 3

Verification of Each Option:

Option A (2): Incorrect. This only accounts for the external cost, ignoring the internal OSPF cost.

Option B (4): Incorrect. This overestimates the cost by adding an extra hop.

Option C (3): Correct. The total cost is 3 (1 for the intra-area link + 2 for the external cost).

Option D (1): Incorrect. This ignores the external cost of the imported route.

A is false – The default value of Local_Pref is 100 , not 0.

B is false – Local_Pref is not advertised to EBGP peers , it is only sent to IBGP peers .

C is correct – The Local_Pref value stays constant unless modified by a route-policy or filter.

D is correct – Higher Local_Pref values indicate preferred paths , so BGP prefers the path with the highest Local_Pref among multiple options.

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“Local_Pref is used to select the best outbound path for traffic leaving the AS. It is only shared among IBGP peers and defaults to 100. The higher the value, the more preferred the route.”

(Chapter: BGP Path Attributes – Section: Local Preference)

The filter-policy command in IS-IS is used to control the advertisement and filtering of routing information. However, it does not directly filter LSPs (Link State Packets); instead, it controls route advertisements. The false statement here is that it filters LSPs ​.

In a route-policy, attributes such as MED (Multi-Exit Discriminator) and Local-Preference can be used in apply clauses to influence BGP route selection. Attributes like AS_Path and Tag are typically matched or filtered but not directly applied in the apply clause ​.

In VRRP HSB (Hot Standby Backup) mode for WLAN deployments (typically between ACs or access controllers), backup of critical data ensures fast failover and minimal service disruption.

A. Real-time backup – Supported. Configuration and session information are synchronized in real-time between the active and standby ACs.

B. Scheduled synchronization – Not supported . HSB requires instant synchronization, not based on a scheduled time.

C. Batch backup – Supported. Some types of less time-sensitive data (e.g., logs or counters) may be backed up in batches.

D. Cloud backup – Not part of HSB functionality . Cloud backup is a separate mechanism, typically used for archival purposes, not real-time failover.

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“VRRP HSB mode supports real-time and batch backup between ACs to protect WLAN services. Scheduled and cloud backups are not part of HSB functionality.”

(Chapter: WLAN Reliability – Section: AC Redundancy and HSB Mechanism)

In a stateful inspection firewall, if the status detection mechanism is enabled, it tracks and validates the state of connections using the session table. If there is no session table and a SYN+ACK packet reaches the firewall, it checks the security policy. If the policy explicitly permits the packet, it will pass through the firewall, but no session table will be created without the initial SYN packet. The other options are either incorrect or misrepresent the behavior of stateful inspection ​.