H12-891_V1.0 Exam Dumps : HCIE-Datacom V1.0

WRED (Weighted Random Early Detection) helps prevent congestion by randomly discarding packets before buffers are full.

Drop Probability Behavior:

Below lower threshold = 0% drop (packets pass normally).

Between lower & upper threshold = Progressively increasing drop probability.

Above upper threshold = 100% drop (probability = 1).

✅ Reference: Huawei HCIE-Datacom Guide - WRED Mechanism

VXLAN Inter-Subnet Routing with Symmetric IRB

VXLAN supports inter-subnet routing using Integrated Routing and Bridging (IRB). In symmetric IRB, both ingress and egress VTEPs perform Layer 3 forwarding to ensure efficient packet forwarding across subnets.

✅ A. Both the ingress VTEP and egress VTEP forward packets based on the Layer 3 forwarding table.

In symmetric IRB, both ingress and egress VTEPs perform Layer 3 lookup and forwarding.

The ingress routes packets before encapsulating them in VXLAN, and the egress performs another Layer 3 lookup to determine final delivery.

✅ D. When VTEPs forward inter-subnet user communication packets, the VNI carried in the VXLAN header is the L3VNI.

L3VNI (Layer 3 VXLAN Network Identifier) is used for inter-subnet routing between VXLAN segments.

Comprehensive and Detailed In-Depth Explanation:

In the Huawei iMaster NCE-Campus solution, when using a third-party Portal authentication application, the following process occurs:

After the Wi-Fi user connects to the network, any attempt to access a website for the first time triggers HTTP redirection.

The user is redirected to the login page provided by the third-party authentication application.

This mechanism ensures that the user authenticates before accessing external resources.

The redirection behavior is consistent with captive portal functionality, which is standard for user authentication on Wi-Fi networks.

Therefore, the statement is TRUE.