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| Section | Weight | Objectives |
|---|---|---|
| Network Automation | 17% | - Automation Technologies
|
| WAN Interconnection Network Planning and Deployment | 8% | - MPLS VPN
|
| Bearer WAN Planning and Deployment | 15% | - Traffic Engineering
|
| Advanced Routing and Switching Technology | 37% | - IS-IS
|
| Campus Network Planning and Deployment | 23% | - Campus Network Architecture
|
>> Accurate H12-891_V1.0 Answers <<
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NEW QUESTION # 278
When aclient invokes the iMaster NCE-Campus RESTful API, it sends anHTTP request. The server then returns thestatus code 401.
Which of the following errors has occurred?
Answer: B
Explanation:
Comprehensive and Detailed Explanation:
#HTTP Status Code 401 Unauthorizedindicates thatauthentication credentialswere either:
Missing(e.g., no API key or token).
Invalid(e.g., expired session, incorrect credentials).
#Error Code Breakdown:
#(D) "Unauthorized" (Correct)# Indicates the clientmust authenticate first.
#(A) "Service Unavailable" (503)# Used when theserver is down.
#(B) "Access Denied" (403)# Used when the clientlacks permissioneven after authentication.
#(C) "Not Found" (404)# Used when theresource does not exist.
#Reference:Huawei HCIE Datacom - iMaster NCE-Campus RESTful API Error Codes
NEW QUESTION # 279
BGP EVPN can be used as the VXLAN control plane protocol to completely prevent traffic flooding, such as broadcast ARP packets, on the VXLAN network.
Answer: A
Explanation:
Understanding VXLAN and BGP EVPN Control Plane
VXLAN (Virtual eXtensible LAN) is an overlay network technology that enables Layer 2 (L2) extension over an IP-based network using MAC-in-UDP encapsulation.
# Traditional VXLAN Flooding Issue:
* Without BGP EVPN, VXLAN uses flood-and-learn behavior for MAC address learning.
* Broadcast, Unknown Unicast, and Multicast (BUM) traffic is flooded to all VTEPs, which is inefficient.
# How Does BGP EVPN Solve Flooding?
* BGP EVPN (Ethernet VPN) replaces the flood-and-learn model with a distributed control plane.
* MAC/IP bindings are advertised through BGP EVPN Type 2 routes, eliminating the need for flooding ARP requests.
* VXLAN routers learn MAC addresses proactively instead of relying on flooding.
Why is the Answer TRUE?
# BGP EVPN fully prevents ARP flooding by distributing MAC/IP bindings via control plane updates.# VTEPs only send traffic to known destinations, reducing network congestion.# BGP EVPN is the industry standard for large-scale data center and campus VXLAN deployments.
Real-World Application:
* Data Centers: Avoids unnecessary ARP request flooding in large cloud networks.
* Campus Networks: Reduces L2 broadcast storms, improving network efficiency.
* Service Provider Networks: Enables scalable multi-tenant VXLAN solutions.
# Reference: Huawei HCIE-Datacom Guide - VXLAN BGP EVPN Control Plane Architecture
NEW QUESTION # 280
MPLS implements data forwarding based on two different planes. Which of the following statements regarding the forwarding mechanism are correct?
Answer: D
Explanation:
Understanding MPLS Forwarding Mechanism
MPLS (Multiprotocol Label Switching) is a high-performance forwarding mechanism that operates on two planes:
1## Control Plane:
* Establishes Label Switched Paths (LSPs) using protocols like LDP (Label Distribution Protocol), RSVP-TE (Resource Reservation Protocol - Traffic Engineering), or BGP-LU (BGP Label Unicast).
* Assigns labels to packets based on routing policies.
2## Data Plane (Forwarding Plane):
* Uses a Label Forwarding Information Base (LFIB) instead of traditional IP routing.
* Packets are forwarded based on labels, not IP addresses.
Analysis of the Answer Choices
# C. The system automatically assigns an ID to the upper-layer application that uses a tunnel. This ID is also called the tunnel ID.
* Correct: MPLS assigns a Tunnel ID to applications that utilize tunnels (e.g., VPNs, MPLS-TE, or L2
/L3 services).
* This ID helps differentiate between various tunnel applications, ensuring traffic follows the correct LSP.
# A. After an IP packet enters an MPLS domain, the MPLS device forwards the packet based on FIB table queries.
* Incorrect: MPLS routers do NOT use the FIB (Forwarding Information Base) for forwarding once labels are assigned.
* Instead, they use LFIB (Label Forwarding Information Base) to switch packets based on labels.
# B. If the tunnel ID is 0x0, the MPLS forwarding process starts.
* Incorrect: If the Tunnel ID is 0x0, MPLS does NOT start; it means no label is assigned, and traditional IP forwarding occurs.
# D. If the tunnel ID is not 0x0, the normal IP forwarding process starts.
* Incorrect: If the Tunnel ID is not 0x0, MPLS forwards traffic using label switching, not IP forwarding.
NEW QUESTION # 281
The naming of SRv6 instructions complies with certain rules. You can quickly determine the function of an instruction based on the instruction name. Which of the following statements about the keywords in SRv6 instruction names are correct?
Answer: A,C,D
Explanation:
SRv6 Instruction Naming Conventions
SRv6 (Segment Routing over IPv6) uses segment identifiers (SIDs) with specific functions, indicated by instruction keywords:
✅ A. T: Searches a specified routing table to forward packets.
T (Table Lookup) → Performs a lookup in a specified routing table and forwards packets accordingly.
❌ B. M: Searches a Layer 2 forwarding table for unicast forwarding.
Incorrect! SRv6 does not use M for Layer 2 unicast forwarding.
✅ C. V: Searches a VPN instance routing table to forward packets.
V (VPN Routing Table Lookup) → Performs a lookup in a VPN instance (VRF) table for forwarding.
✅ D. X: Forwards packets through one or a group of specified Layer 3 interfaces.
X (Cross-connect forwarding) → Forwards packets via a specified Layer 3 interface or group of interfaces.
Reference from Huawei HCIE-Datacom Documentation:
Huawei SRv6 Configuration Guide - SRv6 SID Naming and Instruction Set
HCIE-Datacom Study Material - Segment Routing over IPv6 (SRv6) Functionality
NEW QUESTION # 282
The following statement about isis protocol LSP messages is correct
Answer: A,B,C,D
NEW QUESTION # 283
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