Pass the Huawei HCIE-Datacom H12-891_V1.0 Questions and answers with ValidTests

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In Huawei'sSD-WAN architecture, the following channels are defined:

Management Channel (Callout 1)

BetweeniMaster NCEandEdge devices.

Used for deviceregistration, configuration, and monitoring.

Encrypted with HTTPS.

Control Channel (Callout 2)

BetweenEdge devices and RR (Route Reflector).

Used forroute exchangeandcontrol signaling, typically overMPLS or Internet.

Data Channel (Callout 3)

BetweenEdge to Edge(e.g., HQ to branch).

Used for actualservice traffic transmission, carried overMPLS, Internet, or both.

Correct Mapping:

Management channel→ Callout1(from iMaster NCE to Edge)

Control channel→ Callout2(Edge to RR)

Data channel→ Callout3(Edge to Edge, over MPLS/Internet)

In Huawei’sFree Mobility solution:

Authentication Point (AP): Identifies users and associates them with aSecurity Group Tag (SGT)upon access.

Policy Enforcement Point (PEP): Enforces policiesbetween different security groups, such as allowing or denying traffic.

Key points:

Ais correct — The PEP enforces inter-group access based on defined policies.

Bis incorrect — AP and PEPcan be on separate devices, offering deployment flexibility.

Cis incorrect — Thepolicy enforcementhappens at thePEP, not the AP. AP's job is to authenticate and tag traffic.

Dis correct — AP and PEP can be deployed ondifferent devices.

Correct answers: A, D

In BGP, community attributes help control the advertisement scope of BGP routes. Here’s what each option means:

No_Export: This well-known community attribute prevents BGP routes from being advertised to external BGP (EBGP) peers. Routes with this attribute can still be advertised to internal BGP (IBGP) peers within the same AS. This ensures that the route remains within the originating AS.

No_Advertise: This attribute means that the route should not be advertised toanyBGP peer, whether internal or external.

Internet: Indicates that the route can be advertised to all BGP peers, both internal and external, with no restrictions.

No_Export_Subconfed: Similar to No_Export, but it also restricts advertisement to peers within a BGP confederation. It's more specific and not generally used just to keep routes inside one AS.

Therefore, the correct answer isB. No_Export, as it is the attribute that ensures BGP routes remain within the AS by not being sent to EBGP peers.

Comprehensive and Detailed Explanation:

Inter-AS MPLS L3VPN solutions enable communication between differentAutonomous Systems (AS)while maintaining VPN separation. The three primary solutions for inter-AS MPLS L3VPN are:

Option A (Back-to-Back VRF)

MPLS isnot requiredbetween ASBRs.

VPN routes are exchangedwithout label switching.

Each ASBR has aVRF instanceconfigured and forwards traffic usingplain IP routing.

Option B (eBGP Redistribution of Labeled VPNv4 Routes)

MPLSis not requiredbetween ASBRs.

ASBRsexchange labeled VPNv4 routes using eBGP.

The ASBR doesnot perform label switchingbut simply forwards packets based on VPNv4 labels.

Option C (Multi-Hop MP-BGP for VPNv4 Routes)

MPLS is requiredbetween ASBRs.

ASBRs establishlabel-switched paths (LSPs)to forward VPN traffic across AS boundaries.

SinceOption Brelies onlabeled VPNv4 routes via eBGPand does not need MPLS between ASBRs, the correct answer isD.

????Reference:Huawei HCIE Datacom Study Guide - MPLS VPN Inter-AS Solutions

VXLAN networkssuffer from ARP floodingbecause ARP requests arebroadcasted across all VTEPsin a Layer 2 domain. Toreduce ARP flooding, the following mechanisms can be enabled:

✅A. Local Proxy ARP

Allows the local VTEP to respond to ARP requests without forwarding them across the VXLAN network.

The VTEPcaches MAC-IP mappingsand replies directly to ARP requests, reducing unnecessary flooding.

✅B. ARP Broadcast Suppression

Converts ARP broadcast packets into unicast or multicast packetsto minimize network-wide flooding.

✅C. Host Information Collection

Collects and stores MAC-IP bindings of endpoints, which can be used by proxy ARP to reduce flooding.

Incorrect Answer:

❌D. Port Isolation

Port isolation prevents communication between devices within the same VLANbut doesnot help reduce ARP floodingbetween VTEPs.

Reference from Huawei HCIE-Datacom Documentation:

Huawei VXLAN Configuration Guide – ARP Optimization Techniques

HCIE-Datacom Training Material – Reducing ARP Broadcasts in VXLAN Networks

Comprehensive and Detailed In-Depth Explanation:

By default, OSPF does not automatically associate a domain ID with a process ID. The concept of "domain ID" is primarily used when redistributing routes between OSPF and BGP, particularly in MPLS VPN scenarios. The domain ID in OSPF helps maintain loop prevention and correct route advertisement between different OSPF domains. You can manually configure the domain ID using the domain-id command within the OSPF process view, but it is not inherently set to the process ID.

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

Static information collection and analysisrefers to gatheringnon-changing (static) parametersof the network devices. These parameters are mostlyconfiguration-relatedand do not fluctuate dynamically.

Explanation of Correct Options:

✅A. Device types

Includes information about thehardware platform, model, and series of the device.

Example:Huawei NE40E, CE12800, or AR routers.

✅C. License

Licenses define feature capabilities, such as MPLS, BGP, or security functions.

Licenses arestatic parametersbecause they do not change unless manually updated.

Incorrect Options:

❌B. Interface types

Interface types (GigabitEthernet, FastEthernet, Serial, etc.)can changedepending on hardware or software configurations.

They arenot staticbecause interfaces can beadded or removed dynamically.

❌D. Packet loss rate

Packet loss rate is a dynamic parameter, as it varies depending on network conditions, congestion, or faults.

It is used inperformance monitoringrather than static data collection.

Reference from Huawei HCIE-Datacom Documentation:

Huawei Network Management Best Practices – Static & Dynamic Data Collection

HCIE-Datacom Guide – Network Monitoring and Analysis

Huawei NCE-Campus Network Health Check Manual

Comprehensive and Detailed Explanation:

Theregular expression100.s follows these rules:

100 matchesexactlythe sequence 100.

(dot) representsany single character(digit, letter, or symbol).

s specifically looks for the character s, but it isnot included in the given choices.

Now, analyzing each option:

✔1000matches → 1000 (fourth character matches . as a wildcard).

✘100does not match → No extra character after 100.

✘10000does not match → Too many extra characters.

✘1001does not match → s is not present.

Thus,1000 is the correct answer(C).

????Reference:Huawei HCIE Datacom Regex Guide - Regular Expressions in Networking

In OSPF (Open Shortest Path First), routers connected over broadcast networks (like Ethernet) elect aDesignated Router (DR)andBackup Designated Router (BDR).DR election is based on theinterface priority. If the priority is set to0, the routercannot become a DR or BDR.

Whenboth routers have a priority of 0,no DR or BDR will be elected, and since the election fails, the neighbor relationship between the two routers willnot advance beyond the 2-Way state. In this state, the routers acknowledge each other but do not exchange routing information in detail (as they only form full adjacency with the DR/BDR).

Therefore, the OSPF neighbor relationship remains in the2-Way state.