H12-891_V1.0 Exam Dumps - HCIE-Datacom V1.0

Comprehensive and Detailed In-Depth Explanation:

The iMaster NCE-IP controller uses Telemetry to collect real-time device running status information efficiently and with low latency.

Telemetry (A): Enables continuous data streaming to the controller, including network performance and link state information.

Telnet (B): Used for manual device management and not suitable for automated data collection.

BGP-LS (C): Used for distributing link-state information, but not for real-time performance data collection.

IS-IS (D): An IGP protocol, not used for collecting device status.

Comprehensive and Detailed Explanation:

✔ BIER vs. PIM Multicast Routing:

BIER (Bit Index Explicit Replication) eliminates the need for multicast distribution trees (MDTs) by encoding receiver information into the packet header.

PIM (Protocol Independent Multicast) requires MDTs to manage multicast forwarding paths.

✔ Correct Statements:

✅ (A) BIER uses a Bitstring field in packet headers for forwarding.

✅ (B) PIM builds MDTs to define multicast paths.

✅ (C) BIER does NOT require MDTs, making it more scalable.

❌ (D) Incorrect → BIER does not require hop-by-hop join messages.

📖 Reference: Huawei HCIE Datacom – BIER and PIM Comparison

VXLAN Inter-Subnet Routing with Symmetric IRB

VXLAN supports inter-subnet routing using Integrated Routing and Bridging (IRB). In symmetric IRB, both ingress and egress VTEPs perform Layer 3 forwarding to ensure efficient packet forwarding across subnets.

✅ A. Both the ingress VTEP and egress VTEP forward packets based on the Layer 3 forwarding table.

In symmetric IRB, both ingress and egress VTEPs perform Layer 3 lookup and forwarding.

The ingress routes packets before encapsulating them in VXLAN, and the egress performs another Layer 3 lookup to determine final delivery.

✅ D. When VTEPs forward inter-subnet user communication packets, the VNI carried in the VXLAN header is the L3VNI.

L3VNI (Layer 3 VXLAN Network Identifier) is used for inter-subnet routing between VXLAN segments.

The command output shows:

* > i before both networks, which means these routes are the preferred routes (*) and are learned via internal BGP (i).

Two networks are listed: 3002::3 and 3002::4, which means R1 does have these two routes in its BGP IPv6 routing table.

For 3002::4, the path origin shows 65001 i, which means this route originated from AS 65001 and was learned through IBGP.

The AS Path attribute is only shown for 3002::4, but both routes are clearly present.

Therefore, the correct conclusion is:

D. R1 has routes 3002::3/128 and 3002::4/128.

Comprehensive and Detailed In-Depth Explanation:

The correct configuration is qos car inbound cir 50000 pir 100000.

CIR (Committed Information Rate): The guaranteed minimum bandwidth, set to 50 Mbit/s (50000 kbps).

PIR (Peak Information Rate): The maximum allowable bandwidth, set to 100 Mbit/s (100000 kbps).

This configuration ensures that during peak hours, the minimum guaranteed bandwidth is 50 Mbit/s, while during off-peak hours, the bandwidth can increase to a maximum of 100 Mbit/s. The settings align with the carrier ' s requirements for dynamic bandwidth allocation based on network load.

Intra-Area-Prefix-LSA (Type 9) is used in OSPFv3 to carry IPv6 prefix information for a router or network and is flooded within the area.

Link-LSA (Type 8) is only sent on the local link and is not flooded throughout the area.

Inter-Area-Prefix-LSA (Type 3) and Inter-Area-Router-LSA (Type 4) are also flooded within an area but originate from ABRs, typically for cross-area route advertisement.

That said, Intra-Area-Prefix-LSA is specifically flooded within an area, matching the context of the question directly.

Exact Extract - Huawei HCIE-Datacom OSPFv3 Module:

“Intra-Area-Prefix-LSAs are flooded within the area and advertise the IPv6 prefixes associated with router and network LSAs.”

Understanding SRv6 (Segment Routing over IPv6) Policies

🔹 What is an SRv6 Policy?

A traffic engineering (TE) mechanism used in SRv6-enabled networks.

Defines a set of Segment Routing (SR) paths that direct packets through a predefined set of waypoints.

Uses SRv6 SIDs (Segment Identifiers) instead of MPLS labels.

🔹 How Can SRv6 Policies Be Configured?

✅ Static SRv6 Policy Configuration:

Manually configured by network administrators.

Used in predictable, fixed network paths.

✅ Dynamic SRv6 Policy Generation:

Created dynamically by an SDN controller (e.g., Huawei iMaster NCE).

The controller analyzes network conditions and adjusts paths automatically based on traffic load and link failures.

Why is the Answer TRUE?

✅ SRv6 policies can be configured manually or dynamically delivered by a controller.

✅ SDN-based SRv6 solutions improve network automation and traffic engineering efficiency.

Real-World Application:

Cloud Data Centers: Uses dynamic SRv6 policies for optimal traffic distribution.

5G Transport Networks: Uses SRv6 TE for low-latency service guarantees.

✅ Reference: Huawei HCIE-Datacom Guide – SRv6 Policy and SDN Integration

In Huawei ' s SRv6 instruction naming system, each letter keyword represents a specific forwarding behavior:

X (Cross): Forwards packets via specified Layer 3 interfaces → ✅

M (MAC): Searches Layer 2 forwarding table for broadcast/multicast, not unicast → ❌

V (VPN): Searches the VPN routing table (VRF) for forwarding → ✅

T (Table): Searches a specific routing table (e.g., user-defined) → ✅

Correct answers: A, C, D