Pass the Huawei HCIP-Datacom H12-821_V1.0 Questions and answers with CertsForce

BGP does not advertise all routes learned from peers to other peers. By default, only the best (optimal) routes selected by BGP are advertised to other peers. Additionally, routes learned from IBGP peers are not forwarded to other IBGP peers unless a route reflector or confederation setup is used. The statement claiming all learned routes are advertised is false ​.

The Origin attribute in the display bgp routing-table output is marked as i , indicating that the route was injected into the BGP routing table using the network command. The other options are incorrect because the AS path is not displayed, the MED is 0 , and the route is marked as the best ( > ), meaning it is the optimal route ​.

Comprehensive and Detailed Step-by-Step Explanation:

Definition of Link Aggregation:

Link aggregation combines multiple physical links into a single logical link to improve bandwidth and reliability.

Advantages of Link Aggregation:

Load Balancing (A): Traffic is distributed across all aggregated links to improve performance.

Improved Reliability (B): If one link fails, traffic is rerouted through other links.

Increased Link Bandwidth (C): Bandwidth is effectively the sum of all aggregated links.

Incorrect Option:

Route Backup (D): Route backup is a feature of routing protocols, not link aggregation.

Comprehensive and Detailed In-Depth Explanation:

NET (Network Entity Title) is a special form of NSAP (Network Service Access Point) used in IS-IS routing .

NET consists of three fields :

AFI (Authority and Format Identifier) + IDI (Initial Domain Identifier) + Area Address → Identifies the area .

System ID → Uniquely identifies a router within an area (similar to an OSPF Router ID).

SEL (NSEL - N-selector) → Always 0 in a NET, as IS-IS operates at Layer 3.

Since System ID uniquely identifies a host/router within an area , the correct answer is A .

???? Reference: Huawei HCIA-Datacom Study Guide, IS-IS Addressing and NET Structure.

Comprehensive and Detailed Step-by-Step Explanation:

1. What is VRF (Virtual Routing and Forwarding)?

VRF is a network virtualization technology that enables multiple isolated routing tables to coexist on a single physical device.

Each VRF instance is independent, which ensures separation between different VPNs or users.

2. Resources That VRF Can Independently Own:

Option A: Interface

Correct.

Each VRF instance can have its own set of interfaces. These interfaces are bound to a specific VRF, isolating traffic at the physical or logical port level.

Option B: Routing table

Correct.

VRF instances maintain independent routing tables. This ensures that routes for one VPN do not overlap or interfere with routes of another VPN.

Option C: MAC address table

Incorrect.

The MAC address table is part of Layer 2 operations and is shared by all VRF instances on the device. VRF operates at Layer 3 and does not isolate MAC address tables.

Option D: Routing protocol process

Correct.

Each VRF instance can run its own routing protocol processes (e.g., OSPF, BGP), and these processes are completely independent of other VRF instances.

3. Summary:

The correct resources that can be independently owned by a VRF instance are Interface , Routing Table , and Routing Protocol Process .

A is correct – Removing unused accounts helps minimize the risk surface .

B is false – Email is not a secure method for transferring sensitive information like passwords, even if encrypted.

C is correct – Unique administrator accounts help with accountability and tracking.

D is false – Long-term password validity reduces security. Passwords should be rotated regularly.

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

“To secure admin access, avoid account sharing, delete inactive users, and periodically update credentials through secure channels.”

(Chapter: Device Security – Section: Account Management)

The preference of routing protocols determines the selection order of routes when a router receives multiple routes to the same destination from different routing protocols. For instance, OSPF has a higher preference over RIP, so OSPF routes will be selected first. Huawei routing preferences confirm this behavior ​.

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 ​.