Pass the Huawei HCIE-Datacom V1.0 H12-891_V1.0 Questions and answers with ValidTests

Understanding Huawei SD-WAN VN (Virtual Network) Topologies

Huawei SD-WANusesVirtual Networks (VNs)to providetraffic isolation and policy-based routingfor different services, branches, and applications.

????VN Topologies Can Be Different

Each VN (Virtual Network) can have its own topology.

Some VNs may usefull-mesh, while others may usehub-and-spokeorstar topology.

Different VNs can havedifferent routing and security policies.

✅Example:

Corporate traffic (VN1)→Full-mesh topologyfor efficient inter-branch communication.

Guest Wi-Fi traffic (VN2)→Hub-and-spoke topologyto restrict inter-site communication.

Why is the Answer FALSE?

❌All VNs do not have to use the same topology.

✅Each VN can be configured independently with a unique topology, routing policy, and security settings.

✅Reference:Huawei HCIE-Datacom Guide – SD-WAN VN Topologies and Segmentation

Understanding screen-length Command in Huawei Devices

????What Does screen-length Do?

Controlshow much output is displayed at a timeon the Huawei CLI.

By default, command output is paginated(split-screen display).

screen-length 0 temporarydisables the split-screen display, allowingcontinuous output without pauses.

Analysis of Each Option:

❌A. Performing automatic word wrap→Incorrect

This commanddoes not wrap long text lines, it controlsscreen pagination.

❌B. Performing split-screen display→Incorrect

This commanddisables split-screen display, not enables it.

✅C. Canceling split-screen display→Correct

This allowscontinuous command output without "Press Enter to continue" interruptions.

❌D. Canceling automatic word wrap→Incorrect

Word wrap behavior isnot controlled by screen-length.

Real-World Application:

Automated Network Monitoring:Used inPython scriptsforuninterrupted CLI output collection.

Log Analysis:Helps inextracting large command outputsfortroubleshooting.

✅Reference:Huawei HCIE-Datacom Guide – CLI Configuration and Automation with Paramiko

InHTTP status codes:

401 Unauthorized: The server has received the request butrequires authentication. This typically means:

No token or credentials were provided.

Credentials/token were incorrect or expired.

Other options:

403 (Access Denied)would mean correct credentials butinsufficient permissions.

404: Resource does not exist.

503: Service unavailable.

Correct answer: A. Unauthorized

Huawei’suser access authentication configurationincludes the following components:

AAA scheme: Defines how users are authenticated (local, RADIUS, HWTACACS, etc.).

Domain: Groups users and associates them with an AAA scheme.

Access profile: Defines access control rules like 802.1X, MAC, Portal, or multi-mode authentication.

Correct workflow:

Bind theauthentication profile(which references the access profile) to theuser access interface.

Not the other way around.

Incorrect statement:

D.It incorrectly states youbind the access profile to the authentication profile, when in fact, theauthentication profile binds the access profileand is applied to the interface.

Correct answer: D

OSPFv3 (for IPv6) introduces significant changescompared toOSPFv2 (for IPv4).

While both versions share similarrouting mechanisms, there are keyLSA format and functional differencesbeyond just address changes.

Major Differences Between OSPFv2 and OSPFv3:

Address Independence (LSA Format Changes)

OSPFv3 LSAs do not contain IP addresses directly; they rely onLink-LSA and Intra-Area Prefix LSAto advertise addresses.

InOSPFv2, IP addresses were included in LSA headers.

New LSA Types in OSPFv3

LSA Type 8 (Link-LSA): Advertises a router’s IPv6 address to neighbors.

LSA Type 9 (Intra-Area Prefix LSA): Replaces the address information in Router-LSAs and Network-LSAs.

Support for Multiple Address Families (AF)

OSPFv3 can supportboth IPv4 and IPv6in newer implementations (RFC 5838).

Authentication Mechanism Removed

OSPFv3 relies on IPsec for authentication, whereas OSPFv2 hadbuilt-in authentication mechanisms.

Incorrect Statement Explanation:

❌The statement"LSA formats and functions remain unchanged"isfalsebecause:

LSA structures were modifiedin OSPFv3.

New LSA types were introducedto handle IPv6 addresses separately.

Reference from Huawei HCIE-Datacom Documentation:

Huawei OSPFv3 Configuration Guide – LSA Differences from OSPFv2

HCIE-Datacom Study Material – OSPFv3 Evolution & IPv6 Implementation

Huawei Open Programmability System (OPS) and HTTP Request Headers

HuaweiOPSallowsnetwork automation and programmabilitythroughHTTP-based APIs. When using Python scripts to sendHTTP requests to network devices, the requestheaders must specify the content formatfor data exchange.

✅B. Content-Type: text/json, Accept: text/json (Correct Answer)

Content-Type: text/json→ Specifies that the request bodycontains JSON-formatted data.

Accept: text/json→ Specifies that theresponse should be in JSON format.

BGP EVPN Type 2 Route (MAC/IP Advertisement Route)

This route carriesMAC and IP address bindingsto inform remote VTEPs about locally learned endpoints.

Why Use arp collect host enable?

Collects ARP entriesof locally connected hosts.

EnablesBGP EVPN Type 2 route generationto distribute the learned ARP information.

Incorrect Answer Explanations:❌A. mac-address xxxx-xxxx-xxxx– Manually configures a MAC address butdoes not enable ARP collection for EVPN Type 2 routes.❌B. arp-proxy enable– Enables ARP Proxy butdoes not advertise ARP information using BGP EVPN.❌D. arp distribute-gateway enable– Used inDistributed Anycast Gateway (DAG) modebutnot for collecting host ARP data.

Reference from Huawei HCIE-Datacom Documentation:

Huawei VXLAN EVPN Configuration Guide – ARP Handling and EVPN Type 2 Routes

HCIE-Datacom Training Material – VTEP ARP Advertisement in VXLAN Networks

When selectingcore devicesfor aWANin enterprise networks, considerations typically include:

Service volume: Ensures the core device can handle expected traffic.

Physical location: Important for latency, redundancy, and network design.

Node quantity: Affects topology, scalability, and routing complexity.

Device naming conventions, however, are purely administrative anddo not affectthe functional selection of core devices.

Correct answer: A. Device naming conventions