H12-821 — HCIP-Datacom-Core Technology V1.0
Huawei

HCIP-Datacom-Core Technology V1.0 (H12-821) Practice Questions

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168 questions
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Domain coverage

  • Routing Basics (3%)
  • OSPF Core Knowledge (16%)
  • IS-IS Core Knowledge (8%)
  • BGP Core Knowledge (17%)
  • Routing and Traffic Control (10%)
  • Switching Core Knowledge (7%)
  • Multicast Basics (9%)
  • IPv6 Core Knowledge (3%)
  • Network Security Basics (9%)
  • Network Reliability Basics (8%)
  • Network Service and Management (2%)
  • Large-scale WLAN Architecture (6%)
  • Network Solution (2%)

Sample Questions (17 of 168 shown)

Q1
A company newly purchased a network device. As a network administrator, through what method is the device usually initially configured?
  1. FTP
  2. Telnet
  3. SNMP
  4. Console port login
✓ Correct Answer: D
A newly purchased device has no IP address configured, so it cannot be reached remotely. The console port provides out-of-band, secure local access for first-time configuration. FTP, Telnet and SNMP all require existing IP connectivity.
Q2
On the VRP platform, which of the following descriptions about the default priorities of various routing protocols is correct?
  1. The priority of OSPF routes is 15
  2. The priority of IS-IS routes is 0
  3. The priority of static routes is 60
  4. The priority of BGP routes is 20
✓ Correct Answer: C
Huawei VRP default protocol priorities: Direct=0, OSPF=10, IS-IS=15, Static=60, RIP=100, OSPF ASE=150, BGP=255. Therefore only "static routes = 60" is correct.
Q3
Which of the following statements about RIB and FIB is incorrect?
  1. The RIB directly guides packet forwarding
  2. The next hops in the RIB are all addresses of the peer's directly connected neighbor interfaces
  3. The FIB is generated from the RIB
  4. The RIB does not directly guide packet forwarding
✓ Correct Answer: B
The RIB (IP routing table) selects the best route per destination and installs active routes into the FIB; the FIB (forwarding table) directly guides forwarding. Some RIB entries such as static and BGP routes may have a next hop that is not a directly connected neighbor interface (route recursion resolves it). So B is false. A is also false strictly, but the standard dump answer targets B; the RIB does not directly forward (the FIB does).
Q4
What is the meaning of the letter "B" in the FLAG field of a Huawei forwarding table entry?
  1. Available route
  2. Static route
  3. Black hole route
  4. Gateway route
✓ Correct Answer: C
Forwarding-table flag letters: G=Gateway, H=Host, U=Up, S=Static, D=Dynamic, B=Black Hole (next hop is the null interface), L=Vlink route. So B stands for Black Hole route.
Q5
A socket is composed of a five-tuple. Which of the following does NOT belong to the five-tuple?
  1. Source IP
  2. Source MAC
  3. Destination IP
  4. Destination port
✓ Correct Answer: B
The five-tuple is source IP, source port, destination IP, destination port, and transport-layer protocol. The source MAC address is a link-layer identifier and is not part of the five-tuple.
Q6
Which of the following modules is unique to forwarding devices (compared with routers and switches)?
  1. Switching fabric board
  2. MPU
  3. LPU
  4. SPU
✓ Correct Answer: D
The SPU (Service Processing Unit) provides value-added services such as firewall, NAT, IPSec and NetStream. The MPU is the main control board, LPU is the line processing (service) board, and the switching fabric is common to switches/routers.
Q7
Which key component, together with Huawei NetEngine intelligent routers, builds the IP wide-area bearer network solution?
  1. iMaster NCE-Fabric
  2. iMaster NCE-IP
  3. iMaster NCE-Campus
  4. iMaster NCE-WAN
✓ Correct Answer: D
iMaster NCE-WAN (WAN = Wide Area Network) is the controller component that works with NetEngine routers to build the IP wide-area bearer network solution.
Q8
Which of the following does NOT belong to an IGP (Interior Gateway Protocol)?
  1. RIP
  2. IS-IS
  3. BGP
  4. OSPF
✓ Correct Answer: C
IGPs include RIP, OSPF, IS-IS, etc. BGP is an Exterior Gateway Protocol (EGP family) used between autonomous systems.
Q9
Which of the following descriptions about default routes of various protocols is incorrect?
  1. BGP can advertise default routes
  2. IS-IS can advertise default routes
  3. OSPF cannot advertise default routes
  4. Static default routes can be configured
✓ Correct Answer: C
Both OSPF (default-route-advertise) and IS-IS (default-route-advertise) can advertise default routes into the domain, BGP can import default routes (default-route imported), and static default routes can always be configured. So C is false.
Q10
Which of the following descriptions about BGP, OSPF and IS-IS is correct?
  1. A BGP neighbor relationship is established on top of a TCP session using port 179
  2. IS-IS runs on top of the IP protocol using protocol number 89
  3. BGP runs on top of a UDP session using port 179
  4. OSPF runs on top of a data-link-layer protocol
✓ Correct Answer: A
BGP uses TCP port 179 for neighbor establishment. IS-IS is directly encapsulated at the data link layer (not IP/89; that is OSPF). OSPF runs on IP with protocol number 89.
Q11
Which of the following descriptions about the forwarding plane of switching devices is incorrect?
  1. It implements packet encapsulation and decapsulation
  2. It is composed of the main control board and interface boards
  3. It provides high-speed non-blocking data channels
  4. It can implement packet statistics
✓ Correct Answer: B
The forwarding (data) plane handles packet encapsulation/decapsulation, provides non-blocking channels and performs statistics. The main control board (MPU) belongs to the control plane, not the forwarding plane.
Q12
Which of the following descriptions about the OSPF protocol is incorrect?
  1. The connection types described by a Router-LSA can be: P2P / TransNet / Virtual Link
  2. Routing information is only allowed between the backbone area and non-backbone areas; direct advertisement between non-backbone areas is not allowed
  3. Each OSPF router uses only one Router-LSA to describe the local active connection state of an area
  4. The Link State ID in a Type 3 LSA is the router-id of the ABR
✓ Correct Answer: D
In a Type 3 (Network-Summary) LSA the Link State ID is the destination network address (not the ABR's router-id). Router-LSA (Type 1) connection types include P2P, TransNet, Stub and Virtual Link.
Q13
Which of the following descriptions about OSPF multi-process is incorrect?
  1. Multiple different OSPF processes can run on the same router, independent and unaffected by each other
  2. One interface of a router can only belong to one OSPF process
  3. Route interaction between different OSPF processes is equivalent to route interaction between different routing protocols
  4. Different OSPF routers must have the same process number to establish neighbors
✓ Correct Answer: D
The OSPF process number is locally significant only; neighbors are established based on area ID, hello/dead timers, authentication, etc., not the process number.
Q14
Which of the following descriptions about the ASBR-Summary-LSA (Type 4) is incorrect?
  1. Metric indicates the OSPF cost for the ABR to reach the ASBR
  2. Advertising Router indicates the Router ID of the ABR
  3. Link State ID indicates the Router ID of the ASBR
  4. The Advertising Router field in Type 4 LSAs of all areas is the same
✓ Correct Answer: D
A Type 4 LSA is generated by an ABR to describe an ASBR; its Link State ID is the ASBR's Router ID and Advertising Router is the generating ABR. When a Type 4 LSA crosses areas, the Advertising Router changes to the ABR of that area, so it is not the same in all areas.
Q15
Which type of OSPF area can only reach other areas via a default route?
  1. Backbone area
  2. Totally Stub area
  3. NSSA
  4. Non-backbone area
✓ Correct Answer: B
A Totally Stub area blocks Type 3, Type 4 and Type 5 LSAs; the ABR injects a single Type 3 default route, so traffic to other areas must use that default route.
Q16
Which of the following descriptions about LSA3, LSA4 and LSA5 is correct?
  1. LSA5 does not change after traversing different areas, while LSA3 changes
  2. LSA3, LSA4 and LSA5 do not change after traversing different areas
  3. LSA3 does not change after traversing different areas, while LSA4 and LSA5 change
  4. LSA4 does not change after traversing different areas, while LSA3 and LSA5 change
✓ Correct Answer: A
Type 3 and Type 4 LSAs are regenerated by each area's ABR (Advertising Router changes), whereas Type 5 LSAs are external and their Advertising Router (the ASBR) does not change when crossing areas.
Q17
Which of the following descriptions about the output of display ospf peer is correct?
  1. During DD exchange negotiation, the local end becomes the Slave
  2. Address: 10.1.1.1 indicates the local interface address is 10.1.1.1
  3. Router ID indicates the local router ID is 10.1.1.1
  4. The Designated Router (DR) is the address 10.1.1.1
✓ Correct Answer: D
In display ospf peer output, the "DR" field shows the DR's interface address on that network. If it shows 10.1.1.1, the DR for that segment is 10.1.1.1.

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Exam overview

The HCIP-Datacom-Core Technology V1.0 (H12-821) certification validates a professional's ability to design, deploy, and operate the core data communication technologies that underpin Huawei enterprise networks. Issued by Huawei and delivered through Pearson VUE, it is the mandatory core exam of the HCIP-Datacom track and the gateway to every downstream elective specialization. Passing it confirms hands-on competence across routing, switching, multicast, and network reliability on Huawei VRP platforms.

This exam suits network engineers, datacom specialists, and ICT professionals who manage enterprise routing and switching infrastructure. Huawei recommends holding HCIA-Datacom-level knowledge or equivalent experience with TCP/IP, OSPF, and VLANs before attempting the test, and building confidence on a simulator such as eNSP pays off because the live exam is scenario-heavy. Candidates typically come from campus, WAN, or data-center operations backgrounds.

The blueprint is organized into thirteen weighted knowledge areas rather than simple topic lists, and three of them dominate the paper: BGP Core Knowledge (17%), OSPF Core Knowledge (16%), and Routing and Traffic Control (10%). Multicast Basics (9%), Network Security Basics (9%), Network Reliability Basics (8%), IS-IS Core Knowledge (8%), and Switching Core Knowledge (7%) form the next tier, followed by Large-scale WLAN Architecture (6%), Routing Basics (3%), IPv6 Core Knowledge (3%), Network Service and Management (2%), and Network Solution (2%). Expect single-answer, multiple-answer, true/false, fill-in-the-blank, and drag-and-drop items that probe both theory and configuration.

For H12-821 candidates, our practice set reproduces the exam's thirteen weighted areas in proportion—from OSPF multi-area Stub/NSSA design and BGP path-attribute route selection through MSTP/RSTP switching, VRRP/BFD reliability, and IGMP/PIM multicast. Every online question ships with a detailed answer explanation that cites the Huawei mechanism or configuration command, while the downloadable PDF packages the full bank for offline review during commutes or lab downtime.

Official Exam Domains & Weighting

To successfully pass the H12-821 exam, candidates must master the following core knowledge areas:
  • Domain 1: Routing Basics (3%)
Covers network device frameworks and packet processing on Huawei devices, plus IP routing fundamentals including the routing table, static routing, and route selection principles.
  • Domain 2: OSPF Core Knowledge (16%)
Focuses on OSPF neighbor establishment, area design (including Stub, Totally Stub, NSSA, and Totally NSSA), intra-area/inter-area/external route calculation, route summarization, and the LSA and SPF calculation model.
  • Domain 3: IS-IS Core Knowledge (8%)
Tests IS-IS fundamentals, Level-1 and Level-2 routing, the LSP and SPF mechanism, and DIS election on broadcast networks plus neighbor establishment.
  • Domain 4: BGP Core Knowledge (17%)
Covers BGP route advertisement, path attributes and route reflection (RR), BGP route selection rules, IBGP/EBGP behavior, and MP-BGP EVPN basics.
  • Domain 5: Routing and Traffic Control (10%)
Examines route-policy nodes and matching, traffic filtering, policy-based routing (PBR), and Modular QoS Command-Line (MQC) for forwarding-path control.
  • Domain 6: Switching Core Knowledge (7%)
Focuses on STP/RSTP/MSTP principles, VLAN behavior, and Eth-Trunk link aggregation for bandwidth and reliability.
  • Domain 7: Multicast Basics (9%)
Covers IP multicast fundamentals, multicast forwarding, IGMP operation and features, and PIM-DM/PIM-SM sparse and dense modes.
  • Domain 8: IPv6 Core Knowledge (3%)
Tests IPv6 addressing, ICMPv6 and NDP neighbor discovery, and IPv6 address auto-configuration.
  • Domain 9: Network Security Basics (9%)
Examines Huawei firewall technology, security zones and ASPF, device security features, VPN overview, and VRF fundamentals.
  • Domain 10: Network Reliability Basics (8%)
Focuses on BFD fast failure detection and VRRP gateway redundancy, including preemption and backup-group design.
  • Domain 11: Network Service and Management (2%)
Covers DHCP principles and configuration plus network management protocols such as SNMP and Telemetry.
  • Domain 12: Large-scale WLAN Architecture (6%)
Tests large-scale WLAN networking, VLAN pools, DHCP for wireless, Layer 2/3 roaming, high-reliability techniques, and network admission control.
  • Domain 13: Network Solution (2%)
Introduces enterprise network solutions across campus, data center, SDN, and SD-WAN architectures.

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Frequently Asked Questions

The exam targets network engineers, datacom specialists, and ICT professionals responsible for enterprise routing, switching, and network infrastructure. It is ideal for anyone who manages Huawei-based campus, WAN, or data-center networks and wants to prove professional-level datacom competence. Huawei recommends HCIA-Datacom knowledge or equivalent TCP/IP, OSPF, and VLAN experience before sitting the test.

The blueprint spans thirteen weighted knowledge areas: Routing Basics (3%), OSPF (16%), IS-IS (8%), BGP (17%), Routing and Traffic Control (10%), Switching (7%), Multicast (9%), IPv6 (3%), Network Security (9%), Network Reliability (8%), Network Service and Management (2%), Large-scale WLAN (6%), and Network Solution (2%). Our practice questions are mapped to all thirteen so you can locate weak spots before test day.

After a failed attempt you must wait a cooling-off period—typically 7 to 15 days—before rescheduling, and each retake carries the full exam fee (around 300 USD). Because the paper is scenario-heavy, candidates usually improve most by drilling OSPF area design, BGP route selection, and MSTP/VRRP configuration rather than re-reading theory.

The HCIP-Datacom-Core Technology certification is valid for 3 years. You renew it by passing a current-level or higher Huawei Datacom exam—such as a newer H12-821 version, the H12-831 advanced routing and switching exam, or the HCIE-Datacom written—before the credential expires. No separate renewal fee applies beyond the exam cost.

Yes. Our H12-821 mock exam reproduces the live format—single-answer, multiple-answer, true/false, fill-in-the-blank, and drag-and-drop items—so you can rehearse pacing across the 90-minute window. Use it to build recall on BGP path attributes, OSPF LSA types, and VRRP/BFD scenarios before the real Pearson VUE sitting.

Absolutely. The full question bank is available as a downloadable PDF, letting you review OSPF multi-area Stub/NSSA design, IS-IS DIS election, IGMP/PIM multicast, and WLAN VLAN-pool topics offline—ideal for lab downtime or commutes where a live connection is unavailable.

They are built directly from the official thirteen-area blueprint and emphasize the same practitioner tasks—OSPF inter-area loop prevention and summarization, BGP next-hop and route-reflection behavior, and MSTP/RSTP port-role reasoning. Explanations name the specific Huawei command or protocol mechanism, so you learn the reasoning behind each answer instead of memorizing options.