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

Comprehensive and Detailed In-Depth Explanation:

Thetelemetry protocol stackis structured as follows:

Communication layer (A):Managesdata transmissionbetween the telemetry client (device) and the server.

Transport layer (B):Uses protocols such asgRPC, HTTP/2, or TCPto transmit telemetry data.

Data encoding layer (C):Encodes data using formats likeJSON, Protobuf, or XML.

TheData analysis layer (D)isnot part of the telemetry protocol stackitself.

Data analysis typically occursafter the data has been collected and receivedon the server or collector.

Telemetry focuses ondata collection, encoding, transport, and transmission, not on analysis.

Therefore, the correct answer isD.

Comprehensive and Detailed Explanation:

✔Huawei OPS (Open Programmability System)is aYANG-based network management systemthat usesRESTful APIsfor configuring and managing devices.

✔/ifm/interfaces/interfaceis the RESTfulURI (Uniform Resource Identifier)that:

Represents an interface objectin the network device.

Allows querying, configuring, and modifyingnetwork interfaces via API requests.

Since the statement iscorrect, the answer isTRUE.

📖Reference:Huawei HCIE Datacom – OPS API and Managed Objects

Huawei SD-WAN supports various intelligent traffic steering mechanismsto optimize link utilization andbalance network trafficacross multiple links.

✅D. Traffic bandwidth-based traffic steering

This method ensures that traffic isdistributed across multiple links based on available bandwidth.

SD-WAN dynamically selects linksbased on their real-time bandwidth utilization,ensuring optimal performance and load balancing.

OSPF (Open Shortest Path First) Router-LSA (Type 1 LSA)describesall directly connected OSPF linksof a router and their types. Thefollowing link types can appear in a Router-LSA:

Point-to-Point (P-2-P) (B)– Represents adirect connection between two routers.

Virtual Link (Vlink) (C)– Used toconnect an area to the backbone (Area 0)when a direct connection is unavailable.

Stub Network (StubNet) (D)– Represents anetwork with only one exit point(e.g., a loopback interface or passive interface).

Incorrect Option:

TransNet (A) – Incorrect!

Transit networks appear in Network LSAs (Type 2), not Router LSAs.

Reference from Huawei HCIE-Datacom Documentation:

Huawei OSPF Configuration Guide – Router-LSAs and Link Types

HCIE-Datacom Training Material – OSPF LSAs and Topology Advertisement

Understanding L3VPN over SRv6 BE Networks

🔹What is L3VPN over SRv6?

Layer 3 VPN (L3VPN) allowsmultiple private routing domainsto operate over a shared service provider backbone.

SRv6 (Segment Routing over IPv6) replaces traditionalMPLS labels with IPv6 Segment Identifiers (SIDs).

Best Effort (BE)mode means thatno explicit Traffic Engineering (TE) constraints are applied.

How Routing Works in This Scenario

Key Components in the Network:

PE1 & PE2 (Provider Edge routers): Connect customer networks (CE1 & CE2).

P Router (Core Router): Provides transit between PE routers over SRv6.

SRv6 SID FC00:2::1:79: Used forVPN routing at PE2(End.DT4 function).

Step-by-Step Route Learning Process:

1️⃣PE1 advertises the 192.168.1.0/24 VPN route to PE2 using iBGP VPNv4.

2️⃣PE2 receives the route with next-hop 2001:DB8:1::1 (PE1).

3️⃣PE2 installs the route with the SRv6 Prefix-SID FC00:2::1:79 (End.DT4).

4️⃣The route is imported into the VRF using the import-route command.

Analysis of Each Answer Choice

✅A. An IBGP peer relationship is established between PE2 and PE1, and PE2 learns the route to 192.168.1.0/24 over an IBGP peer relationship.

Correct:The routing table output confirms thatPE2 receives the route via iBGP from PE1.

✅B. The instruction type corresponding to FC00:2::1:79 is End.DT4.

Correct:

End.DT4 is an SRv6 function that represents a Layer 3 VPN endpoint (VRF routing).

PE2 uses End.DT4 to process VPN traffic for 192.168.1.0/24.

✅C. PE2 imports the route 192.168.1.0/24 through the import-route command.

Correct:

Theimport-route command allows BGP-learned routes to be added to the local routing table (VRF).

❌D. The router ID of the BGP process on the P router is 1.0.0.6. (Incorrect Statement)

Incorrect:

The P router is a transit router and does NOT run BGP for VPNv4 routes.

The router ID of PE2 is 1.0.0.11, and the route originator is 1.0.0.2 (likely PE1).

P routers in an SRv6 BE network do NOT need BGP router IDs.

Final Answer: D (The router ID of the BGP process on the P is 1.0.0.6.)

✅Reference:Huawei HCIE-Datacom Guide – SRv6 L3VPN Routing and End.DT4 Function

Real-World Application:

Service Provider Networks:UsesSRv6 to replace MPLS in large-scale VPN deployments.

5G Transport Networks:ImplementsSRv6 L3VPN for high-speed, low-latency services.

In MPLS (Multiprotocol Label Switching), Label Switching Routers (LSRs) handle packets based onFECs (Forwarding Equivalence Classes)and their positions in the label-switched path:

Ingress LSR:The entry point for labeled packets; it classifies packets into FECs and assigns the initial label.

Transit LSR:Intermediate routers that swap labels and forward packets along the LSP.

Egress LSR:The last router in the LSP that removes the label and forwards the packet normally.

An LSRcannotbeboth an ingress and a transit router for the same FEC, because an ingress LSR is defined as thestarting pointfor that specific FEC's LSP. If it’s the ingress, it means the labeled pathstarts there, so it can't be in themiddle (transit)of that same path.

Therefore, the statement isFALSE.

Huawei’sNetwork Access Control (NAC)Portal authentication supports various identity authentication methods for user login via a web page. These include:

Username and password— standard method.

Passcode— one-time password or PIN.

SMS verification code— users receive a dynamic code via SMS for identity verification.

However:

MAC addressauthentication is used inMAC-based authentication, not Portal. MAC authentication allows a device to be authenticated using its MAC address without user interaction (i.e., not via a Portal page).

Correct answer: D. User’s MAC address