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| Section | Weight | Objectives |
|---|---|---|
| Network Automation | 17% | - iMaster NCE
|
| WAN Interconnection Network Planning and Deployment | 8% | - MPLS VPN
|
| Campus Network Planning and Deployment | 23% | - Campus Network Architecture
|
| Bearer WAN Planning and Deployment | 15% | - VPN Services
|
| Advanced Routing and Switching Technology | 37% | - Ethernet Switching
|
>> H12-891_V1.0 New Braindumps <<
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NEW QUESTION # 181
The following information is displayed during OSPF troubleshooting. Based on this information, which of the following is the cause of the failure in establishing an OSPF adjacency relationship?
<Huawei>display ospf error interface GigabitEthernet 0/0/0
OSPF Process 1 with Router ID 10.0.12.2
OSPF error statistics
Interface: GigabitEthernet0/0/0 (10.0.12.2)
General packet errors:
0 : Bad version 0 : Bad checksum
0 : Bad area id 0 : Bad authentication type
0 : Bad authentication key 0 : Unknown neighbor
0 : Bad net segment 0 : Extern option mismatch
0 : Router id confusion
HELLO packet errors:
2 : Netmask mismatch 0 : Hello timer mismatch
0 : Dead timer mismatch 0 : Invalid Source Address
Answer: B
Explanation:
According to the displayed OSPF error statistics from the Huawei device, the key HELLO packet error shown is:
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2 : Netmask mismatch
This indicates that the OSPF adjacency formation is failing due to a subnet mask mismatch between the two OSPF neighbors on the corresponding interface (GigabitEthernet 0/0/0). OSPF uses the subnet mask in Hello packets to ensure that neighbors are in the same network. If the masks do not match, OSPF will not form an adjacency.
From the Huawei Official HCIE-Datacom Study Guide (Version 3.0) - under the OSPF Troubleshooting Section:
"Netmask mismatch: If the subnet mask configured on the interfaces of OSPF neighbors does not match, a 'Netmask mismatch' error occurs. OSPF requires neighbors to be on the same subnet to establish an adjacency. This is a common reason for failure in adjacency formation." (Reference: Huawei HCIE-Datacom V3.0, OSPF Troubleshooting Chapter, Section 4.2 - OSPF Hello and Adjacency Establishment Issues) Thus, among the given options:
A . Area type inconsistency would result in an area ID mismatch error, not netmask.
B . Authentication mismatch would show a bad authentication key or type error.
D . Hello interval mismatches would trigger a Hello timer mismatch error.
Only C. The IP address masks of the interfaces are inconsistent directly matches the actual error observed: Netmask mismatch.
NEW QUESTION # 182
During the configuration of L3VPNv4 over SRv6 BE, if an RR is deployed in the SR domain, which command must be run on the RR to ensure that the PEs at both ends can correctly learn VPNv4 routes?
On a VXLAN-based virtualized network, if the fabric networking mode is centralized gateway networking, the gateway is located on the _____ device. (Capitalize the first letter.)
Answer:
Explanation:
SpineIn VXLAN centralized gateway networking, the default gateway (for both intra- and inter-subnet traffic) is placed on the Spine node, which acts as a centralized gateway device.This architecture simplifies routing and enables centralized control for inter-VNI routing. It is often contrasted with distributed gateway mode, where gateways reside on leaf nodes.Huawei Datacom Reference:"In centralized gateway mode, the spine node functions as the gateway and processes both inter-VNI routing and gateway services."(Source: HCIE- Datacom V1.0 Official Training - VXLAN & Fabric Networking Chapter, Section: VXLAN Gateway Deployment Modes) peer retain-route-target all Explanation:
Understanding L3VPNv4 Over SRv6 BE
# What is L3VPNv4?
L3VPNv4 (Layer 3 VPN over IPv4) allowsMPLS-based VPN servicesover anSRv6 backbone.
UsesMP-BGP (Multiprotocol BGP)to distribute VPN routes.
# Why is an RR (Route Reflector) Needed?
AnRR simplifies BGP route exchangebetween multiple PEs (Provider Edge routers).
Without proper configuration, RRs may filter VPNv4 routes, preventing PEs from learning routes correctly.
Why is the Command peer retain-route-target all Needed?
#Ensures that the RR retains all VPNv4 routes.
#Prevents the RR from filtering route targets (RTs), allowing full VPN reachability.
#Without this command, the RR might not reflect all VPNv4 routes, causing connectivity issues.
Real-World Application:
Enterprise MPLS VPNs:Ensurescorrect BGP route reflection in an SRv6-based L3VPN.
Carrier Networks:Helpsservice providers maintain full BGP VPN route distribution.
#Reference:Huawei HCIE-Datacom Guide - BGP Route Reflectors in L3VPN over SRv6
NEW QUESTION # 183
There is an existing switch running the RSTP protocol. If the network topology changes, what happens to the Layer 2 forwarding table that is automatically learned by the switch?
Answer: D
NEW QUESTION # 184
Network Admission Control (NAC) needs to be deployed on the network shown in the figure. Drag a proper authentication mode to each authentication point.
Answer:
Explanation:
Explanation:
Correct Matching of Authentication Methods:
1# 802.1X authentication # PC (GE0/0/2 on SW3)2# MAC address authentication # IP Phone (GE0/0/3 on SW3)3## Portal authentication # Wireless Clients (Connected via SW2/AP) Understanding Network Admission Control (NAC) Authentication Methods
# Network Admission Control (NAC) enforces security policies before allowing devices onto the network
.# Different types of devices require different authentication methods based on capabilities and security requirements.
Analysis of Each Authentication Type:
# 1## 802.1X Authentication (Used for PC on GE0/0/2 of SW3)
* Best for devices that support user authentication (e.g., PCs, Laptops).
* Requires supplicant software (e.g., Windows or macOS built-in 802.1X client).
* Provides strong security using EAP (Extensible Authentication Protocol) over RADIUS.
# 2## MAC Address Authentication (Used for IP Phone on GE0/0/3 of SW3)
* Best for devices that do not support username/password authentication (e.g., IP Phones, IoT devices).
* Uses MAC addresses as identity credentials.
* Suitable for VoIP networks, industrial IoT, and surveillance cameras.
# 3## Portal Authentication (Used for Wireless Clients on SW2/AP)
* Best for guests or mobile users accessing Wi-Fi networks.
* Redirects users to a web-based login page before granting access.
* Used in public hotspots, campus Wi-Fi, and enterprise guest networks.
Why These Assignments Are Correct?
1## 802.1X for PC:
* PCs support 802.1X authentication via supplicants (EAP-MD5, PEAP, etc.).
* Ensures high security by verifying user credentials.
2## MAC Address Authentication for IP Phone:
* IP Phones lack a username/password interface, so authentication is done via MAC addresses.
* Simplifies authentication while maintaining security.
3## Portal Authentication for Wireless Clients:
* Wireless users do not use 802.1X authentication directly; instead, they are redirected to a web login page.
* Common in enterprise guest Wi-Fi and public hotspots.
Real-World Application:
* Enterprise NAC Deployment: Ensures only authorized users and devices access the corporate network.
* Campus & Hotel Wi-Fi Security: Uses Portal Authentication for guests, 802.1X for employees, and MAC-based for VoIP.
# Reference: Huawei HCIE-Datacom Guide - NAC Authentication Methods & Best Practices
NEW QUESTION # 185
As shown in the figure, PC1 and PC2 are hosts that belong to the same network segment, below about between PC1 and PC2 What are the correct descriptions of IPv6 neighbor states?
Answer: A,B
NEW QUESTION # 186
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