100+ Free Huawei HCIE-Datacom Practice Questions

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Question 1

Score: 0/0

In a multi-area OSPF network with three ABRs connecting area 0 to a regular area 1, which Type-3 LSA originator advertises the area 1 inter-area routes into the backbone?

The DR in area 0

Each ABR independently floods Type-3 LSAs into area 0 summarizing area 1 prefixes

Only the ABR with the lowest router ID

The ASBR in area 1

to track

2026 Statistics

Key Facts: Huawei HCIE-Datacom Exam

Written Questions

H12-891 exam blueprint

90 min

Written Time Limit

Huawei H12-891

800/1000

Written Passing Score

Huawei certification policy

8 hours

Lab Exam Duration

Huawei HCIE Lab

$1,700

Total Cost (Written + Lab)

$300 written + $1,400 lab USD

3 years

Certification Validity

Huawei recertification policy

~30%

First-Attempt Pass Rate

Estimated for combined written + lab

HCIE-Datacom requires a written H12-891 (~70 questions, 90 min, 800/1000) and an 8-hour Lab — total cost $1,700 USD ($300 written + $1,400 lab). Topics span advanced OSPF/IS-IS, BGP route reflectors and confederations, MPLS L3VPN, EVPN VXLAN multi-homing, Segment Routing (SR-MPLS and SRv6), advanced multicast (MVPN, BIER), HQoS, and SDN automation via iMaster NCE with NETCONF/YANG, gNMI, and gRPC telemetry. Certificate is valid 3 years.

Sample Huawei HCIE-Datacom Practice Questions

Try these sample questions to test your Huawei HCIE-Datacom exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a multi-area OSPF network with three ABRs connecting area 0 to a regular area 1, which Type-3 LSA originator advertises the area 1 inter-area routes into the backbone?

A.The DR in area 0

B.Each ABR independently floods Type-3 LSAs into area 0 summarizing area 1 prefixes

C.Only the ABR with the lowest router ID

D.The ASBR in area 1

Explanation: Each ABR independently injects Type-3 (Summary LSA) into area 0 for prefixes learned from non-backbone areas. There is no single elected ABR; all ABRs flood independently. This is why ABR placement and route summarization at the ABR are critical to backbone scalability — duplicate Type-3 LSAs can otherwise bloat the LSDB.

2On a Huawei NE router, OSPF Graceful Restart (GR) helper mode allows the helper neighbor to do which of the following during the restarting router's GR period?

A.Treat the restarting neighbor as down and reconverge immediately

B.Continue forwarding to the restarting router and suppress topology changes for the GR grace period

C.Re-elect the DR/BDR on the segment

D.Tear down the adjacency and rebuild from scratch

Explanation: In OSPF GR helper mode, the helper continues forwarding traffic to the restarting router and does NOT advertise topology changes during the grace period (typically 120 seconds). This preserves data-plane forwarding while the control-plane on the restarting router rebuilds its LSDB. If the restart completes within the grace period, no SPF recalculation propagates network-wide.

3On an Ethernet broadcast segment with five OSPF routers, why is the DR/BDR election necessary?

A.To reduce the number of full adjacencies from O(n^2) to O(n) and limit LSA flooding overhead

B.To select which router will run SPF

C.To assign IP addresses on the segment

D.To choose the routing protocol

Explanation: On a multi-access network, without DR/BDR each router would form full adjacency with every other (n*(n-1)/2 adjacencies). DR/BDR reduces this to a star: every DROther forms full adjacency only with the DR and BDR. LSA flooding is centralized through the DR (using AllDRouters 224.0.0.6), dramatically reducing control-plane chatter on the segment.

4Which OSPF authentication method on Huawei devices is recommended for high-security deployments and uses a per-packet keyed hash with replay protection?

A.Plain-text (Type 1)

B.Null (Type 0)

C.HMAC-SHA256/HMAC-MD5 with cryptographic-authentication and key chain

D.ROT-13

Explanation: OSPFv2 cryptographic authentication using HMAC-SHA family (or MD5) combined with a key chain provides per-packet keyed hashing and an increasing sequence number for replay protection. Plain-text sends the password unencrypted on the wire and is unsuitable for security-sensitive deployments. Huawei NE/CloudEngine support multiple key IDs with rotation via key chains.

5In IS-IS, what is the difference between a multi-instance and a multi-topology deployment?

A.They are identical concepts with different names

B.Multi-instance runs separate IS-IS processes/databases on the same router; multi-topology (MT) runs one process with separate topologies (e.g., IPv4, IPv6) using TLVs 222/229

C.Multi-topology is only for IPv4; multi-instance is only for IPv6

D.Both require RFC 5340

Explanation: Multi-instance IS-IS (RFC 8202) lets one router run multiple independent IS-IS processes (separate LSDBs) on the same interface using Instance Identifier TLV. Multi-topology IS-IS (RFC 5120) extends a single process to maintain separate SPF topologies per address family using MT-ID and TLVs 222 (IS-IS Reachability) and 229 (MT). MT is typical for ships-in-the-night IPv4/IPv6 forwarding.

6In an IS-IS hierarchy with L1, L2, and L1/L2 routers, by default how do L1 routers reach destinations in another area?

A.Direct L1 adjacencies across areas

B.Via the nearest L1/L2 router which sets the ATT bit, prompting L1 routers to install a default route

C.Through BGP

D.They cannot — additional configuration is mandatory

Explanation: L1 routers maintain detailed knowledge only of their own area. The nearest L1/L2 router with reachability outside the area sets the ATTached (ATT) bit in its L1 LSP, and L1 routers install a default route via the closest such L1/L2 router. To leak specific L2 routes into L1, route-leak (down bit, RFC 2966) must be explicitly configured.

7When IS-IS L2-to-L1 route leaking is configured, what protects against routing loops between levels?

A.TTL decrement

B.The Down (D) bit set in leaked routes prevents the L1 router from re-leaking back into L2

C.Sequence numbers

D.BGP communities

Explanation: RFC 2966 defines the Down (D) bit, which an L1/L2 router sets when leaking a route from L2 into L1. If the same prefix is later seen in an L1 LSP with the Down bit set, an L1/L2 router will NOT re-advertise it back into L2. This breaks the potential loop where a leaked prefix could otherwise oscillate between levels.

8In a BGP route reflector hierarchy, why is the cluster-list attribute required?

A.To carry MED values

B.To detect loops when reflectors at different levels reflect routes among themselves

C.To select the best path

D.To carry communities

Explanation: When a route reflector reflects a route, it prepends its CLUSTER_ID to the CLUSTER_LIST. If a reflector receives a route whose CLUSTER_LIST contains its own CLUSTER_ID, it discards the route — this prevents loops in hierarchical RR designs and in topologies with redundant RRs. ORIGINATOR_ID similarly prevents the originating client from reinstalling its own route.

9A BGP confederation differs from a route reflector design in that it:

A.Requires all routers to be in the same AS

B.Splits one AS into sub-ASes that appear as a single AS to external peers, retaining EBGP loop checks internally via the AS_CONFED_SEQUENCE

C.Eliminates the need for full mesh entirely without any internal subdivision

D.Uses OSPF for the data plane

Explanation: Confederations divide a single AS (the confederation ID) into sub-ASes. Sub-ASes peer using EBGP-like sessions (confed-EBGP) which retain AS_PATH loop prevention via AS_CONFED_SEQUENCE/SET segments — these are stripped before sending to a true external peer. Confederations scale BGP without RR while preserving full BGP attributes. Operational complexity is higher than RR.

10To prefer one EBGP path over another for inbound traffic, an operator manipulates AS_PATH using which mechanism on egress to upstream peers?

A.AS_PATH prepend — adding the local AS multiple times to make the path appear longer to remote ASes

B.Local-preference, which influences only outbound choice

C.MED, which is non-transitive between ASes

D.Origin code

Explanation: AS_PATH prepending lengthens the AS_PATH on a particular outbound advertisement so that, downstream, BGP best-path selection prefers a competing shorter-path advertisement. Local-pref is intra-AS only; MED is generally per-neighbor-AS and non-transitive. Prepending is a coarse but widely supported tool when communities are not honored upstream.

About the Huawei HCIE-Datacom Exam

HCIE-Datacom is Huawei's expert-level enterprise networking certification. It validates expert command of large-scale routed and switched networks, MPLS L3VPN, BGP/MPLS, EVPN VXLAN, Segment Routing (SR-MPLS, SRv6), advanced multicast, HQoS, and SDN automation with iMaster NCE. Certification requires passing two exams: the written H12-891 (~70 questions, 90 minutes, 800/1000 to pass) and the 8-hour hands-on Lab exam (configuration and troubleshooting on real Huawei NE/CE topology). Lab seats are scheduled at Huawei test centers and cost $1,400 USD on top of the $300 written fee.

Questions

70 scored questions

Time Limit

90 minutes (written)

Passing Score

800/1000

Exam Fee

$300 written + $1,400 lab = $1,700 total USD (Huawei / Pearson VUE)

Huawei HCIE-Datacom Exam Content Outline

20%

BGP Advanced & MPLS L3VPN

Route reflector hierarchy, confederations, AS_PATH regex, BGP-MD5/TCP-AO, BGP graceful restart, BGP dampening, MPLS L3VPN PE-CE protocols (OSPF sham-link), inter-AS Option A/B/C, BGP-LU

18%

EVPN VXLAN Deep

Type-1/2/3/4/5 routes, distributed anycast gateway, symmetric vs asymmetric IRB, multi-homing single-active and all-active, ESI, DF election, M-LAG, MAC mobility, ARP suppression

15%

Segment Routing (SR-MPLS & SRv6)

Prefix-SID, adjacency-SID, SRGB, SR-TE policies and candidate paths, binding-SID, flex-algo, SRv6 SID format (locator/function/argument), End/End.X/End.DT4 functions, H.Encaps, PSP/USP/USD

12%

MPLS Deep

LDP DoD vs DU, RSVP-TE with CSPF, FRR link/node protection, RECORD_ROUTE_OBJECT, PHP with implicit/explicit null, MPLS QoS uniform/pipe/short-pipe, MSD signaling

10%

IGP Advanced (OSPF & IS-IS)

OSPF multi-area, NSSA, opaque LSAs (OSPF-TE), graceful restart, sham-link, IS-IS multi-instance, multi-topology, route leak with D-bit, wide metric, IS-IS-TE sub-TLVs

Multicast Advanced

PIM-SM with Anycast RP and MSDP, BSR vs AutoRP, NG-MVPN with BGP C-multicast routes, mLDP P2MP, BIER stateless multicast, IGMP snooping, multicast over MPLS profiles

SDN, Telemetry & Automation

iMaster NCE-Campus/Fabric, NETCONF over SSH with YANG, OpenConfig and IETF YANG, gNMI gRPC, streaming telemetry to Kafka with protobuf, Python pyhuawei, Ansible network_cli/netconf

QoS Deep

HQoS hierarchical scheduling (port/subscriber/queue), CIR/PIR dual-rate, MPLS QoS edge classification, Y.1731 OAM CCM/LMM/DMM

IPv6 Advanced

DS-Lite (4-in-6 to AFTR), NAT64/DNS64, MAP-T/MAP-E, 6PE and 6VPE label stacking over MPLS

Security & Container Networking

Smart Policy Routing, GREv2-over-IPsec, MACsec (IEEE 802.1AE) with MKA, Control Plane Protection (CPP/CPCAR), Calico BGP-mode, SRv6 for cloud-native fabrics

How to Pass the Huawei HCIE-Datacom Exam

What You Need to Know

Passing score: 800/1000
Exam length: 70 questions
Time limit: 90 minutes (written)
Exam fee: $300 written + $1,400 lab = $1,700 total USD

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Huawei HCIE-Datacom Study Tips from Top Performers

1Focus heavy on BGP and MPLS L3VPN (20%) and EVPN VXLAN (18%) — together they account for nearly 40% of written content and most of the lab

2Master Segment Routing both flavors: SR-MPLS (prefix/adjacency-SID, SRGB) and SRv6 (locator/function/argument, End functions, H.Encaps) — Huawei is pushing SRv6 hard

3Practice on Huawei eNSP simulator or real NE/CE hardware — the lab is unforgiving of vendor-specific syntax (e.g., 'segment-routing mpls' under IS-IS, summary command on Huawei VRP)

4Memorize EVPN route types 1-5 cold and how multi-homing all-active uses ESI label for split-horizon vs single-active using DF election + Type-1 EAD-per-EVI

5Build muscle memory for time management: in the 8-hour lab, set hard time boxes (IGP+BGP+MPLS in first 2 hours, services next 5, verify in final 30 min)

6Know the iMaster NCE / NETCONF / YANG / gNMI / Kafka stack — automation and telemetry are growing exam topics and reflect modern Huawei deployments

Frequently Asked Questions

How many exams are required for HCIE-Datacom and what does each cost?

Two: the written H12-891 (~70 questions, 90 minutes, $300 USD at Pearson VUE) and the 8-hour hands-on Lab ($1,400 USD at a Huawei test center). Total cost is $1,700 USD. The written must be passed before scheduling the lab.

What is the passing score for the H12-891 written exam?

800 out of 1000 points (80%). The written tests theory across BGP, MPLS, EVPN VXLAN, Segment Routing, multicast, QoS, SDN, automation, and IPv6 transition. The 90-minute time budget averages about 77 seconds per question.

What does the HCIE-Datacom lab actually involve?

The 8-hour lab requires hands-on configuration and troubleshooting on a real multi-device Huawei NE/CloudEngine topology. Tasks span IGP, BGP/MP-BGP, MPLS L3VPN, EVPN VXLAN, multicast, QoS, security, and automation. Time management — building foundations first, then services — is critical to passing.

How long is HCIE-Datacom certification valid?

3 years. Recertification can be done by passing a current Datacom HCIE recertification exam, achieving a higher Huawei expert certification, or completing Huawei's continuing education / re-examination paths within the 3-year window.

What jobs does HCIE-Datacom qualify you for?

Senior network architect and engineering roles at telcos, enterprises, and Huawei partners — especially in regions where Huawei equipment dominates (APAC, MEA, parts of Europe and Latin America). Common titles include Senior Network Engineer, Network Architect, Service Provider Engineer, and Datacom Solution Architect.