Huawei HCIA-Datacom study guide
Huawei HCIA-Datacom · Work through your exam, one topic at a time.
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 study guide has 8 sections and about 2,599 words.
01Data Communication and Network Fundamentals
You must be able to map the OSI seven layers onto the TCP/IP four-layer model and say which device works where: hubs/repeaters at L1, switches and bridges at L2, routers at L3, firewalls and load balancers at L4-L7. Encapsulation adds a header per layer and the PDU is renamed at each step (data → segment → packet → frame → bits).
337 words, about 2 min02IP Addressing and Routing Fundamentals (Static Routing, OSPF Basics)
Know the classful ranges, private space (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), loopback 127.0.0.0/8 and link-local 169.254.0.0/16. Subnet maths: hosts per subnet = 2^h − 2; subnets created by borrowing n bits = 2^n.
318 words, about 2 min03Ethernet Switching Fundamentals (VLAN, STP/RSTP, Link Aggregation)
A VLAN is a broadcast domain; VLAN 1 exists by default and every port starts in it. Access ports carry one VLAN with untagged frames, trunk ports carry many VLANs with 802.1Q tags (4 bytes, 12-bit VLAN ID → 4094 usable VLANs).
331 words, about 2 min04Network Security and Services Fundamentals (ACL, AAA, NAT, DHCP)
Huawei ACL ranges: basic 2000-2999 (source IP only), advanced 3000-3999 (source/destination IP, protocol, ports), Layer 2 4000-4999, user 6000-6999. Rules are evaluated top-down on first match, so order matters - a permit-any placed above a deny makes the deny unreachable.
328 words, about 2 min05WAN Technologies (PPP, HDLC, WAN Access)
PPP is a layered data-link protocol: LCP establishes, configures and tests the link; NCPs (IPCP for IPv4, IPv6CP for IPv6) negotiate network-layer parameters; authentication is optional. Its phases are link dead → establish (LCP) → authenticate → network (NCP) → terminate.
309 words, about 2 min06Network Management and O&M (SNMP, NTP, Telnet/SSH, FTP/TFTP, Syslog)
SNMP has a manager (NMS) and an agent on the device. The MIB is the tree of managed objects and SMI defines the data types.
328 words, about 2 min07IPv6 Fundamentals
An IPv6 address is 128 bits written as eight 16-bit hexadecimal groups. Compression rules: drop leading zeros inside a group, and replace exactly one contiguous run of all-zero groups with :: (used only once).
308 words, about 2 min08SDN, VXLAN and Network Automation Basics (Python, RESTful, NETCONF)
SDN separates the control plane (path computation) from the forwarding plane (packet handling) and centralises control in a controller. Southbound interfaces connect the controller to devices (OpenFlow, NETCONF, SNMP, PCEP); northbound interfaces expose the network to applications through RESTful APIs.
340 words, about 2 min