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

Error analysis:

The error SSLError and CertificateError indicates the server's SSL certificate'shostname doesn't match the IP addressbeing used in the request.

This happens when acertificate is issued for a domain (like devzone.huawei.com), but the client accesses it via an IP address (139.9.213.72), causing atrust failure.

Correct statements:

A—✅: The client doesn't trust the SSL certificate → correct.

B—✅: SSL verification fails due to hostname mismatch.

C—✅: Disabling verification with verify=False bypasses the check (only recommended in lab/testing environments).

D—❌: Uses http instead of https, which changes protocol and defeats the purpose of SSL. Also uses POST without API path.

Correct answers: A, B, C

IS-IS Multi-Process:

Huawei devices support runningmultiple IS-IS processes simultaneously.

These processes arecompletely independentof one another: different LSDBs, interfaces, routing tables, etc.

Each process can be associated with aseparate VPN instance, and asingle VPN instance can be served by multiple IS-IS processes.

IS-IS Multi-Instance:

One IS-IS process canrun multiple instances, typically used formulti-VPN scenarios.

However, Huawei's current implementation prefersone VPN per processfor clarity and control.

Based on Huawei’s design:

Ais incorrect — an IS-IS processcanserve multiple VPNs in other vendors, but Huawei typically uses one process per VPN for clean separation.

Bis correct — a VPN instance can be associated withmultiple IS-IS processes.

Cis incorrect in Huawei implementation context.

Dis correct —IS-IS processes are independent.

Correct answers: B, D

Understanding User Isolation in the Same VLAN

In a traditional VLAN,all devices within the same VLAN can communicateunless additional security policies are applied.To isolate users within the same VLAN, the following technologies can be used:

✅B. Port Isolation (Private VLAN or Layer 2 Isolation)

Prevents communication between ports within the same VLAN.

Common in enterprise and campus networksto improve security.

Example:Isolating guest users from employees within the same VLAN.

✅C. IPSG (IP Source Guard)

BlocksIP address spoofingwithin the same VLAN.

UsesDHCP snooping binding tableto verify whether a device is using anauthorized IP address.

✅D. Ethernet Port Security

Limits the number of MAC addressesallowed per port.

Preventsunauthorized devicesfrom communicating within the VLAN.

❌A. Super VLAN (Incorrect Choice)

Super VLANgroups multiple VLANs under a single Layer 3 gateway, but it doesnot provide isolationwithin the same VLAN.

Real-World Application:

Public Wi-Fi Networks:Ensures thatusers within the same VLAN cannot communicatewith each other.

Enterprise Security:Prevents unauthorized access or attacks withinshared VLANs.

✅Reference:Huawei HCIE-Datacom Guide – VLAN Security and User Isolation Technologies