Pass the Huawei HCIP-Datacom H12-831_V1.0 Questions and answers with Dumpstech

Traditional BGP-4 was designed primarily to advertise IPv4 unicast routing information between autonomous systems.

However, BGP/MPLS IP VPN networks require additional capabilities to transport VPN-specific route information, including Route Distinguishers, Route Targets, and VPN labels.

Multiprotocol BGP (MP-BGP) provides these capabilities by extending BGP through attributes such as MP_REACH_NLRI and MP_UNREACH_NLRI.

MP-BGP supports VPNv4 address families, enabling Provider Edge routers to exchange customer VPN routes while preserving routing separation between VPN instances.

The VPNv4 address family combines a 64-bit RD with a 32-bit IPv4 address, forming a 96-bit VPNv4 address.

Therefore, ordinary BGP-4 IPv4 unicast route advertisements are insufficient for exchanging VPNv4 routing information.

The statement is FALSE because VPNv4 route exchange requires MP-BGP capabilities rather than conventional BGP-4 IPv4 unicast advertisement.

???? Objective:

Asymmetric routing via OSPF cost manipulation

PC1 to PC2 must go through: R1 → R3 → R2

PC2 to PC1 must go through: R2 → R1

???? Step-by-Step Cost Logic:

Path PC1 → R1 → R2 (direct path) must be less preferred than PC1 → R1 → R3 → R2➤ Therefore, make Cost A (R1–R2) high (least preferred)✅ Set A = 50

Path PC1 → R1 → R3 → R2 should be preferred➤ Cost = C (R1–R3) + 10 (R3–R2)✅ Set C = 30, so total = 30 + 10 = 40, which is less than 50

From PC2 to PC1, we want to use R2 → R1➤ So R2 must see R1 as best next-hop to PC1➤ Ensure B (R2–R3) + C is higher than A✅ Set B = 10, so B + C = 10 + 30 = 40, which is more than A = 50 only if C were higher (which it isn’t), but in reverse direction it’s fine because R2 will still prefer direct 10 over B + 10 = 40.

✅ Final Answer Summary:

Label

Value

A

50

B

10

C

30

Official Huawei Extract:

" In OSPF, routing decisions are made based on cost. By manipulating interface costs, you can influence directional path selection (asymmetric routing). Lower total cost equals higher preference. "

— [Huawei HCIA-Datacom Certification Guide – OSPF Cost and Path Selection]