Huawei HCIA-Datacom case studies
Huawei HCIA-Datacom · Put your knowledge to work in context.
The Huawei Certified ICT Associate – Datacom (HCIA-Datacom, exam code H12-811) is Huawei's entry-level certification for data communication networking. It is aimed at candidates starting a career in network engineering or administration - network operations staff, pre-sales and field engineers, students in networking programmes, and IT generalists who need to work confidently with Huawei routers and switches - and it serves as the prerequisite foundation for the higher HCIP-Datacom track. The Huawei HCIA-Datacom case studies are 5 cases and about 4,386 words.
1OSPF over GRE Stuck in EXCHANGE - Partial Reachability and Backup Path Judgement
An enterprise connects HQ and a branch over a GRE tunnel across the internet. Tunnel addresses are 172.16.1.1/30 at HQ and 172.16.1.2/30 at the branch; OSPF area 0 runs over the tunnel while the physical uplinks sit in area 1.
892 words, about 4 min2RSTP Root in the Access Layer Plus an Undocumented Loop
A three-floor campus runs RSTP throughout. Each access switch is dual-homed to distribution switches SW-D1 and SW-D2, and the two floor-3 access switches are also joined by an undocumented patch lead.
864 words, about 4 min3Web Server Unreachable from the Internet - NAT Is Working, Routing Is Not
A company hosts a web server at 192.168.10.20/24 on its internal LAN. The server's default gateway is still configured as 192.168.10.1, the address of a firewall that was removed last month; the AR router's LAN interface is 192.168.10.254/24 and its WAN interface is 200.1.1.2/30.
841 words, about 4 min4Two IPv6 Routers Advertising - Wrong Default Gateway and DHCPv6 Flags
A branch LAN uses prefix 2001:db8:10:1::/64. Two routers advertise RAs on it.
891 words, about 4 min5VXLAN Fabric - Wrong Suspect, Right Problem (MTU)
A small data center runs VXLAN over an OSPF-routed underlay; every underlay link has MTU 1500. Leaf1 (VTEP 10.0.0.1) and Leaf2 (VTEP 10.0.0.2) use static VTEP peers with no multicast.
898 words, about 4 min