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| Section | Weight | Objectives |
|---|---|---|
| Campus Network Planning and Deployment | 23% | - Overlay Network (VXLAN)
|
| WAN Interconnection Network Planning and Deployment | 8% | - MPLS VPN
|
| Bearer WAN Planning and Deployment | 15% | - Traffic Engineering
|
| Network Automation | 17% | - iMaster NCE
|
| Advanced Routing and Switching Technology | 37% | - Route Control
|
>> Technical H12-891_V1.0 Training <<
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NEW QUESTION # 137 
As shown in the following figure, an engineer tests network interconnection between two branches. To implement network interconnection, OSPF is deployed on R1, R2, and R3 of branch 1, and IS-IS is deployed on R2, R3, and R4 of branch 2. Which of the following operations needs to be performed to allow R1 to access R4's loopback interface address?
Answer: A
Explanation:
Understanding the Network Scenario:
* R2 is the boundary router between OSPF and IS-IS.
* OSPF and IS-IS do not automatically redistribute routes between each other.
* R4's loopback (10.1.4.4/32) exists in the IS-IS domain.
* To allow R1 (OSPF) to reach R4's loopback, R2 must redistribute IS-IS routes into OSPF.
Why Option C Is Correct (#)
# default-route-advertise in OSPF on R2:
* This advertises a default route into the OSPF domain, allowing OSPF routers (R1, R3) to forward unknown traffic to R2.
* Since IS-IS routes are not automatically injected into OSPF, this ensures R1 can reach R4.
# IS-IS Already Has Routes to OSPF
* IS-IS routers (R3, R4) already learn routes from OSPF via R2 (assuming route redistribution is properly configured).
* No need to run default-route-advertise in IS-IS.
Why Other Options Are Incorrect (#)
# A. Run default-route-advertise in both OSPF and IS-IS views on R2
* Unnecessary in IS-IS. The IS-IS domain already learns OSPF routes from R2 via redistribution.
* Only OSPF needs a default route to forward unknown traffic to R2.
# B. No configuration is required
* Incorrect, because OSPF does not automatically learn IS-IS routes.
* A default route or redistribution is needed for R1 to reach R4.
# D. Run default-route-advertise only in the IS-IS view on R2
* Incorrect, because IS-IS already has routing information from OSPF.
* The issue is with OSPF not learning IS-IS routes, so the command needs to be in OSPF view.
# Reference: Huawei HCIE Datacom - OSPF and IS-IS Route Redistribution and Interoperability
NEW QUESTION # 138
To allow only authorized users (users who obtain IP addresses through authorized DHCP servers or use specified static IP addresses) to access the network shown in the figure, which of the following solutions can be used?
Answer: A
Explanation:
Understanding Network Security for Authorized User Access
🔹 Problem Scenario:
Only authorized users should be allowed network access.
Users can obtain IP addresses either via DHCP or a predefined static IP list.
Unauthorized users (e.g., attackers using rogue DHCP servers or spoofed IPs) must be blocked.
🔹 Required Technologies for Securing Access:
1️⃣ DHCP Snooping - Protects against rogue DHCP servers and builds a binding table of legitimate DHCP clients.
2️⃣ IP Source Guard (IPSG) - Ensures that only authorized IP-MAC bindings can send traffic.
Analysis of the Answer Choices:
❌ A. DAI + Port Security (Incorrect)
DAI (Dynamic ARP Inspection) prevents ARP spoofing but does not validate IP-MAC-DHCP bindings.
Port Security only limits MAC addresses per port but does not verify IP addresses.
Does NOT protect against unauthorized static IP users.
✅ B. DHCP Snooping + IPSG (Correct)
DHCP Snooping:
Prevents rogue DHCP servers from assigning unauthorized IPs.
Builds a DHCP binding table (IP-MAC-Port).
IP Source Guard (IPSG):
Blocks traffic from IPs not listed in the DHCP snooping binding table.
Can be configured to allow manually specified static IP addresses.
Best choice to allow only authorized users (both DHCP and static IP users).
❌ C. DHCP Snooping + DAI (Incorrect)
DAI (Dynamic ARP Inspection) prevents ARP spoofing but does not block unauthorized static IP users.
Lacks IP-level access control needed to enforce static IP policies.
❌ D. DAI + IPSG (Incorrect)
IPSG (IP Source Guard) needs DHCP Snooping to build the binding table.
Without DHCP Snooping, IPSG cannot function properly.
DAI does not provide complete protection against unauthorized users.
Why is the Answer B (DHCP Snooping + IPSG)?
✅ Ensures only users assigned a DHCP IP (or authorized static IPs) can send traffic.
✅ Blocks rogue DHCP servers and unauthorized static IP users.
Real-World Application:
Enterprise Networks: Prevents unauthorized static IP users or attackers from accessing VLANs.
Public Wi-Fi Security: Ensures only authorized users receive IPs and can send traffic.
✅ Reference: Huawei HCIE-Datacom Guide - DHCP Snooping and IPSG Security Mechanisms
NEW QUESTION # 139
In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network.
Answer: B
Explanation:
InMPLS LDP (Label Distribution Protocol), label retention modes control how labels are stored in theLabel Forwarding Information Base (LFIB).
DU Label Advertisement Mode (Downstream Unsolicited):
Labels areadvertised to all LDP peers without a request.
The receiving routerdecides which label to usefor forwarding.
Liberal vs. Conservative Label Retention:
#Liberal Label Retention Mode (Correct Answer)
All received labels from all LDP peers are stored.
Even if apeer is not the optimal next hop, its label is retained.
Allowsfaster convergenceduring failures.
#Conservative Label Retention Mode
Only the label from the best next-hop peer is stored.
Reduces memory usage but can slow down convergence in case of failure.
Reference from Huawei HCIE-Datacom Documentation:
Huawei MPLS LDP Configuration Guide - Liberal vs. Conservative Label Retention HCIE-Datacom Training Material - Label Advertisement in MPLS Networks
NEW QUESTION # 140
There is a concept of FEC-Forwarding Equivalence Class in MPLS, so what criteria can FEC not allocate based on?
Answer: B
NEW QUESTION # 141
A home user has opened a 1Mb/s bandwidth, and in order to improve the user experience, the operator can stabilize 2Mb/s when measuring speed If we use the listening bucket technology to achieve this requirement, which of the following methods is optimal.
Answer: B
NEW QUESTION # 142
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