Free Huawei H12-821_V1.0 Practice Exam with Questions & Answers | Set: 6

Comprehensive and Detailed In-Depth Explanation:

OSPF-to-BGP route redistribution does not allow modification of MED values directly using a route-policy in Huawei devices.

Instead, MED can be set using a BGP attribute policy, not through the import command .

All other options (B, C, D) are correct :

B → Route-policy can filter imported direct routes .

C → network command does not modify attributes , only announces existing routes.

D → peer command can set Local Preference via route-policy.

???? Reference: Huawei HCIA-Datacom Study Guide, BGP Route Policy and Attribute Modification.

Edge ports are used in RSTP to bypass the spanning tree calculation for ports connected to end devices. By configuring ports like SWD ' s GE0/0/2 and SWC ' s GE0/0/2 as edge ports, they transition directly to the Forwarding state upon activation, ensuring faster convergence. Statement A is incorrect because receiving BPDU invalidates the edge port status ​.

Root protection ensures that a designated port does not become a root port by discarding superior BPDUs. However, if superior BPDUs are no longer received, the port can return to its original forwarding state, meaning its role can change. This makes option B incorrect, while the other options correctly describe RSTP behavior ​.

A is correct – Local attack defense can classify and prioritize packets (e.g., OSPF, BGP, SSH) and ensure critical protocols are processed first by the CPU.

B is correct – The dynamic link protection function ensures session-based applications (like SSH) are not disrupted even during a CPU attack.

C is false – Different protocols have different importance levels , so individual rate limits should be configured, not a uniform one.

D is correct – CPU protection also applies to management interfaces , such as those used for Telnet, SSH, or SNMP.

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

“Devices support local attack defense by classifying packets, setting priorities, and limiting rates to protect CPU resources. These policies also apply to the management interface.”

(Chapter: Network Security – Section: Local Attack Defense)

 IS-IS Overview : Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol. Routers exchange Link State Packets (LSPs) to maintain a synchronized link-state database. These LSPs are categorized into Level-1 LSPs (intra-area routing) and Level-2 LSPs (inter-area routing). Both types share the same packet format.

Comprehensive and Detailed Step-by-Step Explanation:

WAN Definition:

A WAN is a large-scale network spanning a wide geographical area, connecting smaller networks such as LANs and MANs.

Use Cases:

WANs are commonly used for interconnecting campus networks, branch offices, and data centers over long distances.

Correct Statement:

The statement accurately describes the purpose and scope of WANs.

Comprehensive and Detailed In-Depth Explanation:

Type 7 LSAs (NSSA External LSAs) are used in Not-So-Stubby Areas (NSSAs) to carry external routing information.

These LSAs are generated only by ASBRs within an NSSA , and later converted to Type 5 LSAs by the ABR .

Stub areas do not allow ASBRs , meaning Type 7 LSAs cannot exist in a stub area .

The question incorrectly states that Type 7 LSAs can be generated in stub areas , which is false .

???? Reference: Huawei HCIA-Datacom Study Guide, OSPF LSA Types and Area Configurations.

Comprehensive and Detailed In-Depth Explanation:

Neighbor Discovery Protocol (NDP) replaces ARP in IPv6 and uses ICMPv6 messages for:

Router Solicitation (RS) → Sent by hosts to request Router Advertisement (RA) messages .

Router Advertisement (RA) → Sent by routers to announce prefixes and network parameters.

Neighbor Solicitation (NS) → Used for address resolution and Duplicate Address Detection (DAD) .

Neighbor Advertisement (NA) → Sent in response to NS messages .

Redirect → Used by routers to redirect hosts to better gateways .

RS is not directly used for address resolution ; Neighbor Solicitation (NS) does this , so the answer should be D .

???? Reference: Huawei HCIA-Datacom Study Guide, NDP and ICMPv6 Packet Types.