H12-811-V2.0: HCIA-Datacom V2.0

By Huawei · Browse Mode
About the Exam

HCIA-Datacom is Huawei's associate-level certification for foundational datacom and enterprise networking skills. It covers routing and switching, WLAN, network security, network O&M, and SDN/network automation basics, and it is aimed at learners in information science and computer-related majors or anyone interested in datacom. Passing demonstrates basic capability to build small enterprise networks with routers and switches and to perform routine deployment, management, and troubleshooting.

Exam Topics

  • Data communication and network basics8%
  • Build an IP network with interconnection and interworking27%
  • Ethernet switching network construction28%
  • Cyber security infrastructure and network access8%
  • Network services and applications5%
  • WLAN basics10%
  • WAN basics3%
  • Network management and O&M3%
  • IPv6 basics5%
  • SDN and automation basics3%

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  3. Learn Mode — Spaced repetition schedules questions you struggle with for long-term retention.

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Last updated September 15, 2026 at 10:57 PM

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QuestionQ1

Build an IP network with interconnection and interworking

NAPT and Easy IP translate both IP addresses and port numbers, enabling multiple private IP addresses to share multiple public IP addresses.

Explanation

NAPT performs address-and-port translation, distinguishing concurrent private connections through translated port numbers so private hosts can share public address resources. Easy IP uses this address-and-port translation behavior with public addresses associated with an outbound interface.

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QuestionQ2

Cyber security infrastructure and network access

When a Huawei device operates as an SSH client and logs in to another network device for the first time, the ssh client first-time enable command must be executed to enable the SSH client’s first-time login function. Otherwise, the login will fail.

Explanation

SSH client first-time authentication is enabled by default on Huawei network devices, allowing the client to automatically accept and locally save an unrecognized server's public key on the first connection. The ssh client first-time enable command is only required to restore this behavior after it has been explicitly disabled with undo ssh client first-time enable; it is not a mandatory prerequisite that must always be executed before a first-time login can succeed.

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QuestionQ3

Cyber security infrastructure and network access

AAA stands for authentication, authorization, and accounting. The accounting function records only fees incurred when users consume network resources, and does not record Internet-access traffic or duration.

Explanation

AAA accounting collects resource-consumption data for billing, auditing, capacity planning, and trend analysis. It can record Internet-access usage, including traffic volume and session duration; it is not limited to fees. RFC 2975

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QuestionQ4

Build an IP network with interconnection and interworking

R1 has these configurations:

[R1] nat address-group test 1  
[R1-address-group-test] section 1 100.1.23.1 100.1.23.254  
[R1-address-group-test] mode pat  
[R1-address-group-test] quit  
[R1] nat-policy  
[R1-policy-nat] rule name test  
[R1-policy-nat-rule-test] source-address range 192.168.0.0 192.168.255.255  
[R1-policy-nat-rule-test] action source-nat address-group test  
[R1-policy-nat-rule-test] quit  
[R1-policy-nat] quit  
[R1] interface GE 0/0/2  
[R1-GE0/0/2] nat enable  
[R1-GE0/0/2] quit

Which of the following statements is incorrect?

Explanation

PAT performs many-to-one address translation and uses port translation to distinguish concurrent sessions. Consequently, multiple intranet users with different original IP addresses can share the same post-NAT IP address; they are not required to have different translated IP addresses. The configured address pool includes 100.1.23.254 as a possible translated address.

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QuestionQ5

Network services and applications

When an FTP client signs in to a Huawei network device operating as an FTP server, which command can upload a local file to that FTP server?

Explanation

The put command uploads a local file from the FTP client to the remote FTP server. Huawei documents its format as put local-filename [ remote-filename ].

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