試験準備には欠かさない！H12-891_V1.0問題解答でH12-891_V1.0試験問題集
リアルHuawei H12-891_V1.0試験問題 [更新されたのは2026年]
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質問 # 79
Which of the following statements about BGP EVPN principles are correct in a scenario where a VXLAN tunnel is dynamically established through BGP EVPN?
- A. MP_REACH_NLRI is used to carry routing information.
- B. MP_REACH_NLRI is used to carry the RT.
- C. MP_REACH_NLRI is used to carry the RD.
- D. Several BGP EVPN routes are defined through BGP extension.
正解：A、B、D
解説：
BGP EVPN in VXLAN Tunneling
#A. MP_REACH_NLRI is used to carry routing information.
MP_REACH_NLRI (Multiprotocol Reachable Network Layer Reachability Information)is used inBGP updatesto carryVXLAN reachability information.
#B. Several BGP EVPN routes are defined through BGP extension.
BGP EVPN introduces multiple route types, such asType 2 (MAC/IP Advertisement), Type 3 (Inclusive Multicast), and Type 5 (IP Prefix Advertisement).
#D. MP_REACH_NLRI is used to carry the RT.
RT (Route Target) defines route import/export policies in VPN environments.
MP_REACH_NLRI carries the RT attributein BGP EVPN updates.
#Incorrect answer:
#C. MP_REACH_NLRI is used to carry the RD.
Wrong!TheRoute Distinguisher (RD)is carriedinside BGP attributes, but not in MP_REACH_NLRI.
Reference from Huawei HCIE-Datacom Documentation:
Huawei VXLAN BGP EVPN Configuration Guide - BGP EVPN Route Types
HCIE-Datacom Training Material - VXLAN Dynamic Tunnel Establishment
質問 # 80
Network administrator A wants to use an IP prefix-list to match specific routes. Which of the following routes can be matched by the IP prefix-list shown in this figure?
ip ip-prefix TEST permit 10.0.0.0 24 less-equal 30
- A. 10.0.2.0/24
- B. 10.0.0.1/30
- C. 10.0.1.0/24
- D. 10.0.0.0/24
正解：B、D
解説：
Understanding Prefix Lists
* IP Prefix-Lists are used for filtering BGP routes and controlling route advertisement & redistribution.
* The command ip ip-prefix TEST permit 10.0.0.0 24 less-equal 30 means:
* Matches prefix 10.0.0.0/24 exactly.
* Matches any subnet of 10.0.0.0/24 with a prefix length between 24 and 30.
Analysis of Routes:
* # 10.0.0.0/24 # Matches exactly.
* # 10.0.0.1/30 # Falls within 10.0.0.0/24 & length #30.
* # 10.0.1.0/24 # Not within 10.0.0.0/24 range.
* # 10.0.2.0/24 # Not within 10.0.0.0/24 range.
Real-World Use Case:
* BGP route filtering: Only allows 10.0.0.0/24 and its subnets (up to /30).
* Prevents unintended route propagation in large-scale networks.
# Reference: Huawei HCIE-Datacom Guide - BGP Prefix-Lists
Next Steps
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質問 # 81
Regarding the LDP protocol session establishment process, the description is correct?
- A. The party with the larger transmission address initiates the establishment of a TCP connection as the active party
- B. Hello messages discovered by LDP neighbors use TCP messages with a destination address of multicast address 224002
- C. When both parties receive a keepalive message from the peer, the LDP session is successfully established
- D. After the TCP connection is successfully established, the active party sends an initialization message to negotiate the relevant parameters of the LDP session,
正解：A、C、D
質問 # 82
The following description of MED, correct:
- A. MED is an optional non-transitional attribute
- B. MED The default value is 0
- C. MED default value is 100
- D. MED can only be passed within this AS
正解：A、B
質問 # 83
As shown in the figure, there are two IP6 networks that can access the IPv4 network, and the IPsec tunnel needs to be established between the two IPv6 networks to communicate, which of the following requirements?(). Single choice questions).
- A. ESP + tunnel mode
- B. AH + tunnel mode
- C. AH + transmission mode
- D. None of the above options are correct
正解：A
質問 # 84
On a virtualized network deployed using iMaster NCE-Campus, after creating VNs, you need to configure inter-VN communication. Which of the following configurations is used to achieve VN communication?
- A. Configure traffic filtering.
- B. Create a static route for the VPN instance corresponding to the VN.
- C. Deploy OSPF for the VPN instance corresponding to the VN.
- D. Deploy a routing policy.
正解：D
解説：
In Huawei'sCloudCampus Solution, VNs (Virtual Networks) areisolated by defaultfor security purposes. To enableinter-VN communication, you must explicitly configure policies that allow traffic between different VNs.
The correct way to control and enable this communication is viarouting policies, especiallyinter-VN routing policieson thecore or border nodes.
Static routesorOSPF deploymentsare not sufficient or appropriate for policy-controlled VN communication in this context.
Correct answer: D. Deploy a routing policy
Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: Virtual Network Deployment with iMaster NCESection: Inter-VN Routing Configuration
質問 # 85
Two routers connected through a firewall cannot establish a BGP neighbor relationship. What causes it?
- A. BGP neighbors must form a Layer 2 adjacency
- B. Firewalls that do not have an open UDP port number of 179
- C. EBGP Multi-hop is not configured
- D. The firewall did not release IP protocol number 89
正解：B
質問 # 86
During isis ' broadcast network database synchronization, is the following statement correct?
- A. RI and R3 maintain database consistency by periodically sending PSNP requests.
- B. R2 as DIS does not receive PSNP nouns for other routes.
- C. R2, as DIS, sends CSNP periodically.
- D. R2 As DIS, Hello time is 3 times that of a normal router.
正解：C
質問 # 87
Which of the following statements about RADIUS is correct?( Single choice questions).
- A. RADIUS authentication and Portal authentication cannot be used together because the Portal server can typically be used to authenticate users when portal authentication is deployed.
- B. RADIUS supports both wired and wireless access modes.
- C. MAC authentication does not require a username password, so you cannot use RADIUS to authenticate the user.
- D. SEPARATION OF RADIUS PROTOCOL AUTHENTICATION, AUTHORIZATION, AND AUDIT.
正解：B
質問 # 88
NETCONF provides a set of mechanisms for managing network devices. NETCONF operations take place on a configuration datastore of network devices. Which of the following statements is incorrect about the configuration datastore?
- A. The < commit > operation submits the configuration in a startup configuration datastore to a running configuration datastore.
- B. The configuration datastore of network devices can be classified into the candidate, running, and startup configuration datastores.
- C. The < validate > operation is oriented at the candidate configuration datastore.
- D. The < delete-config > operation is oriented at the startup configuration datastore.
正解：A
解説：
NETCONF definesdatastoresto manage device configurations:
running: Active configuration in use
candidate: Staging area for changes before applying
startup: Configuration loaded on reboot
NETCONF operations:
< commit > : Applies changes fromcandidate # running##
< delete-config > : Deletes a specified datastore (e.g., startup) ##
< validate > : Validates syntax/logic in thecandidate datastore##
Statement D is incorrect: < commit > never submits config from startup to running- that's handled automatically at boot time, not through NETCONF commands.
Correct answer: D
Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: Network Automation and NETCONFSection: NETCONF Datastores and Operations
質問 # 89
How do 8021w and 8021D handle BPDUs?( Confirmed) The
- A. 8021D bridge only forwards BPDU packets received from the root bridge
- B. The 8021D bridge does not forward BPDU messages
- C. 8021w Bridge does not forward BPDU packet
- D. The 8021w bridge forwards only BPDU packets received from the root bridge
正解：A
質問 # 90
SR-MPLS uses IGP extensions to advertise labels and reserve bandwidth to support high-bandwidth services.
- A. TRUE
- B. FALSE
正解：A
解説：
SR-MPLS leverages IGP (OSPF/IS-IS) extensions to advertise Segment IDs (SIDs) and can also integrate with TE (Traffic Engineering) for bandwidth reservation using RSVP-TE or SR-TE.
Exact Extract - Huawei SR-MPLS Configuration Guide:
"SR-MPLS uses extensions in IGP to distribute label bindings and, combined with traffic engineering, supports bandwidth assurance and high-bandwidth services." Reference:
Huawei SR-MPLS Deployment Guide
HCIE-Datacom Training Manual - Traffic Engineering with SR
質問 # 91
Regarding the Stub region in the OSPF protocol, the following statement is correct.
- A. ASBR cannot exist in the Stub zone
- B. Type7 LSA injection is not allowed in the Stub zone
- C. Backbone zones cannot be configured as Stub zones
- D. Virtual connections cannot traverse the Stub region
正解：A、B、C、D
質問 # 92
The following description of the RD attribute filter for BGP is correct?
- A. If RD-filter is configured, but the routed RD is not matched with any of the RDs defined in the rule, the default match result is permit.
- B. There is always an "or" relationship between the rules configured by RD-filter.
- C. If RD-filter is not configured, but the RD-filter is referenced for filtering, the matching result is deny.
- D. Multiple rules are matched in the order in which they are configured.
正解：B、D
質問 # 93
MPLS supports both static and dynamic LSP establishment. Which of the following protocols cannot dynamically establish LSPs in MPLS TE scenarios? (Select all that apply)
- A. RSVP-TE
- B. OSPF
- C. IS-IS
- D. BGP
正解：B、C、D
解説：
InMPLS Traffic Engineering (TE),Label Switched Paths (LSPs)can be established:
Statically: Manual configuration.
Dynamically: Typically viaRSVP-TE.
Protocol roles:
RSVP-TE:Used to dynamically establish and signal TE LSPs##
OSPF / IS-IS: Act asIGP protocolsand provide TE-related link-state information (like bandwidth) butdo not establish LSPs themselves## BGP: Used forroute advertisement, not forLSP setupin MPLS TE ## Correct answers: A, C, D
質問 # 94
The following description of VLANs in Ethernet is correct?
- A. The default reserved VLANs for Huawei devices are 4000~4010
- B. VLANs can be extended through QinQ technology.
- C. VLANs do not support bulk creation on devices
- D. The range of VLANs is 0 to 4096
正解：B
質問 # 95
The following statement about static VXLAN tunnel configuration is correct?
- A. NVE interface, and multiple VXLAN tunnels can create only one NVE interface
- B. A BD needs to create an NVE country, and when there are multiple BDs, multiple NVE interfaces must be created
- C. For a VXLAN tunnel, you need to create a corresponding NVE interface, in which you explicitly specify the source IP address and the destination IP address , so there are multiple VXLAN tunnels on the VTEP that must be vE interfaces The destination address of the VXLAN tunnel is specified in the
- D. An NVE interface can be associated with multiple VNls, so you can create only one NVE interface when there are multiple BDs
正解：A
質問 # 96
The basic header length of an IPv6 message is a fixed value.
- A. TRUE
- B. FALSE
正解：A
質問 # 97
You need to configure smart policy routing on the router to specify that specific traffic is forwarded through an interface. When policy-based routing is applied, what are the two most typical types of information that can be used to forward traffic along a particular path?
- A. Service type header and message length
- B. Source A address and the Layer 2 source address
- C. Source IP address and specific protocol (such as FTP, HTTP, etc.)
- D. The TTL and source IP address of the packet
正解：C
質問 # 98
When you deploy BGP/MPLSIPVPN, when two VPNs have a common site, the common site must not use overlapping address spaces with the other sites of the two VPNs.
- A. When an LSR is TransitLSR, you need to configure both ln Label and Out Label, both of which are
161023 The Out Label ranges from 16 to 1048575 - B. When an LSR is An Egyptian LSR, only in Label needs to be configured, ranging from 16-1023
- C. TRUE
- D. When an LSR is Ingress LSR, only configure Out Label, which ranges from 16-1048575
- E. FALSE ?:B
499The series description for configuring static lSPs in MPLS networks is correct? - F. When an LSR is a Transit LSR, you need to configure both In Label and Out label, both in the range of
16-1023
正解：E、F
質問 # 99
Complete the basic processing procedure for DiffServ model-based QoSshown in the figure
正解：
解説：
Explanation:
TheDifferentiated Services (DiffServ) modelforQuality of Service (QoS)enables traffic management based on predefined priorities. This involvesclassifying, policing, queuing, and scheduling trafficto ensure efficient network resource utilization.
Breakdown of Each QoS Processing Step:
#Step 1: Traffic Classification and Marking
Purpose:Identifies and marks packets based onQoS attributessuch asDSCP (Differentiated Services Code Point) or 802.1p priority bits.
Function:Assigns aQoS labelto packets for further processing.
Example:Packets carryingvoice traffic (EF - Expedited Forwarding)are marked forhigh-prioritytreatment.
#Step 2: Traffic Policing (CAR - Committed Access Rate)
Purpose:Enforcesbandwidth limitson specific traffic flows to prevent excessive usage.
Function:Drops or re-marks packetsexceeding the assigned bandwidth threshold.
Example:If avideo stream exceeds 10 Mbps, excess packets may bedropped or re-marked.
#Step 3: Congestion Management (Queuing and Scheduling)
Purpose:Managestraffic flow through queuesbased on assigned QoS levels.
Function:Places packets in appropriatepriority queues (e.g., Strict Priority, Weighted Fair Queuing - WFQ, CBWFQ).
Example:Voice packets are assigned tohigh-priority queuesforlow-latency forwarding.
#Step 4: Congestion Avoidance
Purpose:Prevents networkbuffer overflows and excessive packet drops.
Function:Uses mechanisms likeWRED (Weighted Random Early Detection)to drop lower-priority packets before congestion occurs.
Example:If a queuereaches 80% capacity, WRED may droplow-priority packetsto maintain QoS.
#Step 5: Traffic Shaping
Purpose:Smooths out traffic burststo maintain a consistenttransmission rate.
Function:Buffers and delays packetsto prevent excessive packet drops.
Example:Ifoutgoing traffic exceeds 50 Mbps, shaping ensures itdoes not exceedthis limit while maintaining steady flow.
質問 # 100
The following figure shows the inter-AS MPLS VPN Option B solution. If ASBR-PE1 and ASBR-PE2 only transmit VPNv4 routes, you can run the following command on ASBR-PE1:
[ASBR-PE1-bgp-af-vpnv4] undo peer 10.0.34.4 enable
- A. FALSE
- B. TRUE
正解：A
解説：
Comprehensive and Detailed In-Depth
In the inter-AS MPLS VPN Option B solution:
Option B establishes a multi-hop eBGP connection between the ASBRs (ASBR-PE1 and ASBR-PE2) to exchange VPNv4 routes.
In this setup, the ASBRs exchange labeled VPNv4 routes via MP-BGP (Multiprotocol BGP).
The command:
[ASBR-PE1-bgp-af-vpnv4] undo peer 10.0.34.4 enable
is used to disable VPNv4 route exchange between the ASBR-PE1 and ASBR-PE2.
If this command is executed, ASBR-PE1 will not transmit VPNv4 routes to ASBR-PE2, breaking the inter-AS VPN connectivity.
Therefore, the statement is FALSE because ASBR-PE1 and ASBR-PE2 must exchange VPNv4 routes to maintain connectivity between the VPN sites across different ASes.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei MPLS VPN Configuration Guide
Inter-AS Option B (eBGP Multi-Hop) for MPLS VPNs
質問 # 101
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