H12-831_V1.0 Exam Dumps : HCIP-Datacom-Advanced Routing & Switching Technology V1.0

When OSPF detects a failure in the network, it performs a series of actions to ensure traffic is rerouted to a valid path. The phases occur in this strict order:

✅ Fault Detection (A)

OSPF routers use Hello packets to maintain neighbor relationships.

If a Hello timeout or link down is detected, the fault is immediately recognized.

✅ LSA Update (B)

Upon detecting a failure, the router generates a new LSA (e.g., a Router-LSA or Network-LSA) and floods it to all other routers in the same area.

This LSA communicates the change in network topology.

✅ Route Calculation (C)

Each router that receives the updated LSAs runs the SPF algorithm to recompute the best path to every destination.

✅ Entry Delivery to the FIB (D)

After recalculating the routes, the router installs the new forwarding entries into the FIB (Forwarding Information Base), allowing data to be forwarded along the new optimal path.

✅ Official Huawei Reference:

" OSPF convergence after a network failure consists of fault detection, LSA flooding, SPF calculation, and updating the FIB. Each step must be completed for traffic to resume correctly on alternate paths. "

— [Huawei HCIA-Datacom Certification Guide – Chapter: OSPF Convergence and SPF Algorithm]

Comprehensive and Detailed In-Depth Explanation:

The display startup command is used to check the startup and running configuration details of a Huawei network device.

It provides information on:✅ Running system software (currently active firmware).✅ Running configuration file (current settings in use).✅ Startup system software (firmware that will load on reboot).✅ Startup configuration file (configuration that will be applied on reboot).✅ Paths of these files in the storage system.

This command helps network administrators ensure that the correct firmware and configuration files are used when the device boots.

???? Reference: HCIP-Datacom Advanced Routing & Switching Technology – System Management and Configuration Files

OSPFv3 introduces Link-LSAs to advertise link-local addresses, IPv6 prefixes, and relevant interface options to routers connected to the same link.

Unlike Router-LSAs and Network-LSAs, a Link-LSA provides IPv6 addressing information associated with a particular interface.

In the displayed Link-LSA, the field Number of Prefixes has a value of 3. Three IPv6 prefix entries are listed: 2000:14::/64, 2001:14::/64, and 2002:14::/64.

The exhibit also includes a link-local IPv6 address beginning with FE80::. This address belongs to the link-local address space and must not be counted as a global unicast prefix.

Therefore, the intended examination interpretation is that the interface has three global unicast address prefixes.

Strictly, an LSA ' s prefix count does not independently prove the precise number of individual interface addresses, but among the provided options, D is the intended answer.