Just passed the H13-811_V3.5 exam (HCIA-Datacom). It's the updated version of the old Routing & Switching cert with added automation and Python basics.
The HCIA-Cloud Service V3.5 exam focuses on VLANs, OSPF, IPv6 and basic BGP. You'll also get tested on SDN controllers and network automation fundamentals. Make sure you practice with Huawei CLI - theory alone won't cut it.
I used the official Huawei guide and eNSP for labs. Pass4Success HCIA Cloud Service V3 5 practice questions helped me identify weak spots in the automation sections before test day.
If your network runs Huawei gear, this cert is worth it. If you're in a Cisco-only shop, skip it and go for CCNA instead. It's an entry-level exam, so senior architects should aim for HCIP or HCIE.
Happy to answer questions if anyone's preparing for it. Good luck!