Free H12-811_V1-0 Practice Test Questions and Answers (2026)

The statement is true. Layer 2 loops, created by redundant physical connections between switches without a loop-prevention mechanism, are a primary cause of broadcast storms. When a broadcast frame enters a looped topology, each switch forwards the frame out of all ports except the ingress port. The frame is then received by other switches in the loop, which repeat the process. This creates an endless circulation and exponential multiplication of broadcast traffic, consuming all available bandwidth and switch CPU resources, ultimately leading to a network outage. Spanning Tree Protocol (STP) is the standard mechanism to prevent such loops.

This is a true/false question where 'A' represents 'True'. The statement is a fundamental and accurate description of a common Layer 2 network problem. There are no other options to evaluate.

- Huawei HedEx Documentation for VRP, "STP/RSTP/MSTP Configuration Guide", Section: "STP/RSTP/MSTP Overview > Background". This section explicitly states that loops can cause broadcast storms.

- Tanenbaum, A. S., & Wetherall, D. J. (2011). Computer Networks (5th ed.). Pearson Education. Chapter 4, "The Medium Access Control Sublayer", discusses bridged networks and the problem of loops causing broadcast storms.

- Huawei HCIA-Datacom V1.0 Training Material, "Spanning Tree Protocol (STP)", Section: "Background". This material introduces STP as a solution to problems like broadcast storms caused by network loops.

The statement accurately describes the "first-match" principle for Access Control Lists (ACLs). Network devices process ACL rules sequentially from top to bottom (typically by rule ID). When a packet's attributes match the conditions of a rule, the device immediately executes the specified action (permit or deny) and stops further processing of the ACL for that packet. Consequently, if a general rule (e.g., permit any) is placed before a more specific rule (e.g., deny host 192.168.1.10), the specific rule will never be evaluated for packets that match the general rule. Therefore, it is a critical best practice to place more specific (stricter) rules before more general (looser) rules to ensure the intended filtering logic is correctly applied.

The option 'False' is incorrect because failing to order ACL rules from most specific to most general can lead to unintended network behavior. A general rule can prematurely match traffic, effectively "shadowing" and nullifying the effect of subsequent, more specific rules, thus compromising the security policy.

1. Huawei HCIA-Datacom V1.0 Training Material, "ACL Principles", Section: ACL Matching Mechanism. (This section details that rules are matched in ascending order of rule IDs and the process stops at the first match).

2. Huawei VRP V800R012C10 Configuration Guide - Security, "ACL Configuration", Section: ACL Configuration Notes. (This guide emphasizes that the sequence of rules is crucial and specific rules should be configured before general ones).

3. Comer, D. E. (2018). Internetworking with TCP/IP Volume 1: Principles, Protocols, and Architecture (6th ed.). Pearson. Chapter 28, "Firewalls and Network Address Translation," discusses the importance of rule order in packet filters.

The question's validity cannot be fully confirmed without the referenced figure. However, based on the definition of an OSPF Area Border Router (ABR), the statement is almost certainly false. An ABR is a router that has at least one interface in the backbone area (Area 0) and at least one interface in a non-backbone area. A router with all its interfaces within a single area (including Area 0) is an internal router, not an ABR. A typical multi-area OSPF network will contain internal routers within each area. Therefore, it is highly improbable that "all routers on the network except RTA are ABRs." For example, any router connected only to other routers within Area 1 would be an internal router, not an ABR.

The other option, True, is incorrect because it contradicts the fundamental definitions of OSPF router types. A network topology where every router except one connects to both the backbone and another area is not a standard or efficient design and would imply that almost no routers are internal to their respective areas.

Huawei HedEx Documentation, HCIA-Datacom V1.0 Training Material (Model H12-811), "OSPF Concepts". This material defines the different types of OSPF routers. It specifies that an ABR "connects the backbone area to a non-backbone area" and has interfaces in at least two different areas, one of which must be Area 0. It also defines an internal router as a device with all interfaces belonging to the same OSPF area.

Cisco Press, "CCNP and CCIE Enterprise Core ENCOR 350-401 Official Cert Guide", Chapter 10, "OSPF". This reputable source defines an ABR as a router with interfaces in more than one OSPF area, which is a standard industry definition applicable to Huawei's implementation.

While it is true that both alternate and backup ports in RSTP do not forward user traffic (they are in discarding state), the statement is FALSE because these ports DO receive and process BPDUs. In RSTP, alternate and backup ports actively participate in the protocol by:

- Receiving BPDUs from other switches

- Processing received BPDUs to maintain up-to-date topology information

- Being ready to rapidly transition to forwarding state if needed

The key distinction is that while they don't forward user data frames, they maintain full BPDU processing capability to ensure rapid convergence when topology changes occur.

Why the Statement is Wrong:

The second part of the statement - "cannot receive, process, and send BPDU" - is incorrect. RSTP's rapid convergence mechanism depends on all ports (including alternate and backup ports) maintaining current topology information through BPDU exchange. This is a fundamental difference from legacy STP where blocked ports had limited BPDU processing.

This is a True/False question. The alternative, True, is incorrect because it misrepresents the function of Alternate and Backup ports. The core purpose of these port roles in RSTP is to listen to BPDUs to maintain awareness of the network topology and be ready for a fast failover, which requires them to receive and process BPD-Us.

1. IEEE 802.1D-2004 Standard, Section 17.4.1: "Port States and Port Roles" - Details RSTP port behaviors including BPDU processing in discarding state

2. Huawei S5700 Series Switches Configuration Guide - MSTP, Section 1.1.4: "RSTP Port States" - Documents that ports in discarding state still process BPDUs

3. IEEE 802.1w-2001 (RSTP Amendment), Section 17.21: "Port State Transitions" - Specifies BPDU handling requirements for all port roles

4. Huawei HCIA-Datacom V1.0 Training Materials, Chapter 9: "Spanning Tree Protocol," pages 9-15 to 9-17 - Explains RSTP port roles and their BPDU processing capabilities

5. RFC 7727 "Spanning Tree Protocol (STP) Application of the Inter-Chassis Communication Protocol (ICCP)", Section 2.1: References IEEE standards for RSTP behavior including BPDU processing in non-forwarding states

The statement is true. The Wi-Fi Alliance, an industry organization that certifies Wi-Fi products for interoperability, introduced a simplified, generational naming scheme to make it easier for consumers to identify the capabilities of their devices. Under this scheme, the IEEE 802.11ax standard is marketed and known as "Wi-Fi 6". This standard offers significant improvements over its predecessor, Wi-Fi 5 (802.11ac), including higher efficiency, capacity, and performance, especially in dense environments.

This is a true/false question. The statement is factually correct, so any option suggesting it is false would be incorrect.

1. Huawei HCIA-Datacom V1.0 Training Material, "802.11 Protocol Family," Section 5.1.2. This section lists the evolution of Wi-Fi standards and their corresponding names, explicitly mapping 802.11ax to Wi-Fi 6.

2. Wi-Fi Alliance. (2018). Wi-Fi Alliance® introduces Wi-Fi 6. [Press Release]. Retrieved from the official Wi-Fi Alliance website. This official announcement establishes the "Wi-Fi 6" designation for devices supporting the IEEE 802.11ax standard.

3. IEEE 802.11ax-2021 - IEEE Standard for Information Technology--Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks--Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 1: Enhancements for High-Efficiency WLAN. The standard's documentation is the ultimate source for its technical specifications, which are marketed as Wi-Fi 6.

The statement is True. Huawei AR G3 series routers, running the Versatile Routing Platform (VRP) operating system, are designed for enterprise networks and provide comprehensive network management features. The software includes support for all standard versions of the Simple Network Management Protocol (SNMP): SNMPv1, SNMPv2c, and SNMPv3. While they are all supported by the system software by default, an administrator must explicitly enable and configure the SNMP agent to use them.

False – all three versions are included in the base image; only activation/configuration is needed.

- Huawei AR Series Routers V200R008C30 Product Documentation, Configuration Guide - Network Management and Monitoring, "SNMP Configuration". The guide provides configuration procedures for SNMPv1, SNMPv2c, and SNMPv3, confirming that the device software supports all three versions. The presence of configuration commands for all versions indicates default support in the platform.

The statement is true. Stacking technology, such as Huawei's iStack, is designed to connect multiple physical switches so they function as a single logical device. This simplifies network management by providing a single management IP address, a unified configuration file, and a single forwarding plane for the entire stack. The number of switches that can be stacked depends on the specific switch model and software version, but it is designed to be more than two to provide scalability and high port density.

This is a true/false question. The statement is factually correct, so there are no incorrect options to evaluate.

1. Huawei CloudEngine S5735-L Series Switches Product Documentation, "Device Management Configuration Guide", Section: "iStack Configuration". This guide details how to configure iStack with multiple member switches (e.g., up to 9 for this series).

2. Huawei HCIA-Datacom V1.0 Training Material, "Ethernet Switching". The courseware describes stacking as a method to virtualize multiple switches into one logical device to expand port capacity and simplify management.

The statement contains a factual error. The TCP three-way handshake (SYN, SYN-ACK, ACK) is used exclusively to establish a connection. To terminate or disable a connection, TCP uses a separate four-way handshake process (FIN, ACK, FIN, ACK). While it is true that TCP supports reliable data transmission, the premise that the three-way handshake is used for both establishing and disabling connections is incorrect, making the entire statement false. TCP's reliability is primarily achieved through mechanisms like sequence numbers, acknowledgments, and data retransmission, not the handshake process alone.

A. Claiming the statement is true ignores the four-way termination defined in RFC 793, so it is wrong.

- Huawei HCIA-Datacom V1.0 Training Material, "Transport Layer Protocols", Section: "TCP Connection Management". This section explicitly details the three-way handshake for connection establishment and the four-way handshake for connection termination.

- J. Postel, "RFC 793 - Transmission Control Protocol," Section 3.5 "Closing a Connection," September 1981. This foundational document specifies the four-packet exchange (four-way handshake) for closing TCP connections.

The statement is false. A core principle of OSPF's hierarchical area-based design is to limit the scope of link-state information flooding. Routers within a specific OSPF area maintain an identical and complete Link-State Database (LSDB) for that area, which contains detailed topology information (Type 1 and Type 2 LSAs). However, this detailed information is not flooded into other areas. Instead, Area Border Routers (ABRs) summarize the routing information from their attached areas and advertise these summaries into the backbone area (Area 0) as Type 3 LSAs (Summary LSAs). Therefore, a router in the backbone area has detailed information only about the backbone area itself, plus summary information about networks in other areas, not the complete LSDBs of those other areas.

The statement claims a backbone router has "complete LSDBs" of other areas. This is fundamentally incorrect; it only has summary LSAs (Type 3) representing networks in other areas, not the full set of Type 1 and Type 2 LSAs that constitute a complete intra-area LSDB. Therefore, the statement cannot be true.

1. Moy, J. (April 1998). RFC 2328: OSPF Version 2. The Internet Society. Section 3.5: "The Area Border Routers". This section explicitly states, "The topology of an area is hidden from the rest of the Autonomous System. This information hiding reduces the amount of routing traffic." It details how ABRs originate summary-LSAs, not flood the entire intra-area LSDB.

2. Huawei. (2020). HCIA-Datacom V1.0 Training Material (Model H12-811). Chapter: "OSPF Basic Principles". This material explains the concept of OSPF multi-area design, the role of ABRs, and the different LSA types, clarifying that Type 1 and Type 2 LSAs are confined within an area, while Type 3 LSAs are used for inter-area communication.

3. Cisco Systems. (2005). OSPF Design Guide. Cisco Press. While a Cisco publication, it describes the vendor-neutral OSPF protocol standard. The section on "OSPF Areas and Border Routers" explains that the primary benefit of areas is that the detailed topology of an area is invisible outside the area, and routes are summarized at the ABR, thus reducing the LSDB size on internal routers.

The statement is true. The root bridge is the origin point for all configuration BPDUs in a stable Spanning Tree Protocol (STP) topology. The Message Age field within a BPDU indicates the time elapsed since the BPDU was generated by the root bridge. Therefore, when the root bridge itself creates and sends a configuration BPDU, it sets the Message Age field to 0. As downstream switches receive and forward this BPDU, they increment the Message Age value, typically by 1.

This is a true/false question. The statement is factually correct according to the STP standard, making the "False" option incorrect.

1. Huawei, "HCIA-Datacom V1.0 Training Material," Version 2.20, Chapter: "Spanning Tree Protocol," Section: "STP BPDUs," p. 211. (Describes the fields of a configuration BPDU, stating the root bridge sets Message Age to 0).

2. IEEE Std 802.1D-2004, "IEEE Standard for Local and Metropolitan Area Networks--Media Access Control (MAC) Bridges," Clause 9.2.5, "Message Age." (Specifies that the Message Age is zero for Configuration Messages transmitted by the Root Bridge).

3. Huawei HedEx Documentation for S Series Switches, "Ethernet Switching Configuration Guide," Chapter: "STP/RSTP Configuration," Section: "Principles of STP."

The TCP/IP protocol suite operates in layers. Web services (like HTTP and HTTPS) use the Transmission Control Protocol (TCP) at the Transport Layer for reliable data transfer. The Internet Protocol (IP) at the Network Layer encapsulates the TCP segment. The IPv4 header contains an 8-bit "Protocol" field that identifies the transport layer protocol being carried in its payload. The Internet Assigned Numbers Authority (IANA) officially assigns the decimal value of 6 to TCP. Therefore, any IP packet carrying web traffic will have the value 6 in this field.

This is a True/False question. The statement is factually correct based on the official standards of the TCP/IP suite. For instance, if the service used UDP, the value would be 17.

1. Postel, J. (1981). RFC 791: Internet Protocol. The Internet Society. Section 3.1, "Header Format". This foundational RFC specifies the IPv4 header format, including the "Protocol" field. (Available at https://datatracker.ietf.org/doc/html/rfc791)

2. Internet Assigned Numbers Authority (IANA). Protocol Numbers. This official registry lists the value 6 for "Transmission Control Protocol (TCP)". (Available at https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml)

3. Kurose, J. F., & Ross, K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson. Chapter 4, "The Network Layer: Data Plane", discusses the IPv4 datagram format, including the protocol field's function.

The statement is false. The IEEE 802.1Q standard specifies the valid range for VLAN identifiers (VLAN IDs) as 12 bits, which allows for 4096 values (0-4095). However, VLAN ID 0 is used for priority-tagged frames, and VLAN ID 4095 is reserved for protocol use. Therefore, the configurable range for user VLANs is from 1 to 4094. VLAN 4096 is outside this valid range and cannot be configured or used on a trunk interface.

The option "True" is incorrect because VLAN 4096 is an invalid VLAN ID according to the IEEE 802.1Q standard. Network devices, including Huawei switches, adhere to this standard and do not support VLAN IDs outside the 1-4094 range for configuration.

1. Huawei, "HCIA-Datacom V1.0 Training Material," Document Version V1.0, Chapter: "VLAN Principles", Section: "VLAN Overview", Page 107. The document states, "A VLAN ID ranges from 1 to 4094."

2. IEEE Std 802.1Q-2018, "IEEE Standard for Local and metropolitan area networks—Bridges and Bridged Networks," Section 9.6 "VLAN tag format and parameters". This standard defines the 12-bit VLAN Identifier (VID) field, specifying that VID 0x000 and 0xFFF (4095) are reserved, making the usable range 0x001 to 0xFFE (1 to 4094).

The statement is correct. On Huawei switches running the Versatile Routing Platform (VRP), certain VLAN IDs are reserved or have special properties. VLAN 1 is the default VLAN; all ports belong to it by default, and it is used for some control plane protocols. For system stability and default operation, it cannot be deleted. VLAN ID 4095 is reserved by the IEEE 802.1Q standard for implementation use and is used by Huawei's system for internal purposes, making it unavailable for user configuration.

This is a "True or False" question. The statement accurately describes the behavior of VLAN 1 and VLAN 4095 on Huawei devices, so the "False" option is incorrect.

1. Huawei HCIA-Datacom V1.0 Training Material. (2020). Section 2.2.1 VLAN Overview - VLAN ID Range. This section details the VLAN ID range from 0 to 4095, noting that VLAN 1 is the default VLAN and that VLANs 0 and 4095 are reserved by the protocol.

2. Huawei VRP V800R021C00 Configuration Guide - VLAN. VLAN Configuration - VLAN Overview - VLAN ID. The guide specifies: "A VLAN ID ranges from 1 to 4094. VLAN 1 is the default VLAN. VLANs 0 and 4095 are reserved for system use." This confirms both parts of the question's statement.

The configuration depicts a standard "router-on-a-stick" model for inter-VLAN routing. Both PCs are correctly configured to use the router's respective sub-interface as their default gateway. When a PC in one VLAN needs to communicate with a PC in another, it sends the traffic to its gateway (the router). The router then performs a routing lookup and forwards the packet to the correct destination VLAN via the appropriate sub-interface. This process relies on standard IP routing and ARP resolution within each VLAN, not Proxy ARP. Proxy ARP is not necessary when end devices have a properly configured default gateway for off-subnet communication.

B. False: The statement is true. Standard inter-VLAN routing does not depend on Proxy ARP, so disabling it will not prevent communication in this correctly configured scenario.

1. Huawei, "HCIA-Datacom V1.0 Training Material," document version C01, Chapter: "VLAN Principles and Configuration," Section: "Inter-VLAN Routing," pp. 28-30. This section details the configuration and data forwarding process for one-armed routing, which does not involve Proxy ARP.

2. Huawei, "HedEx V200R005C00, AR1200 Series Enterprise Routers Configuration Guide - IP Unicast Routing," Section: "ARP Configuration," Subsection: "Configuring Proxy ARP." The documentation explains that Proxy ARP is used to enable communication between hosts on the same network segment but with different network IDs, a scenario different from the one presented.

The provided ACL configuration rule 5 permit source 172.16.105.2 0 uses a basic ACL (number 2000) to explicitly permit traffic originating from the single host IP address 172.16.105.2. The wildcard mask 0 is equivalent to a host mask of 0.0.0.0, ensuring an exact match for only that source IP. Crucially, all Huawei ACLs have an implicit deny any rule at the end. When this ACL is applied to filter incoming traffic on the Telnet (VTY) interface, it will permit connection attempts from 172.16.105.2 and, due to the implicit deny, block connection attempts from all other source IP addresses.

The option 'False' is incorrect. It might be chosen by someone forgetting the implicit deny any rule that is appended to every ACL. Without this implicit rule, the ACL would only permit the specified host but would not explicitly block others, which is not how ACLs function. The combination of the explicit permit and the implicit deny creates a "whitelist" policy.

1. Huawei HCIA-Datacom V1.0 Training Material, "Configuring a Basic ACL", Section: Applying an ACL to a VTY Interface to Control Login Users. (This section provides examples of using basic ACLs to restrict Telnet/SSH access).

2. Huawei VRP V800R012C10 Configuration Guide - Security, "ACL Configuration", Section: Default ACL Rule. (This document explicitly states that "By default, an implicit deny rule exists at the end of each ACL to deny all packets that do not match any rule in the ACL.").

3. Huawei HedEx Documentation for NE40E Routers, "ACL Configuration", Section: Configuring a Basic ACL. (This documentation confirms that a wildcard mask of 0 matches a specific host).

In Spanning Tree Protocol (STP) and its variants (RSTP, MSTP), the Bridge ID is used to elect the root bridge. The Bridge ID consists of a configurable Bridge Priority and the device's MAC address. The default Bridge Priority value for Huawei switches, as with most other vendors following the IEEE 802.1D standard, is 32768. This standardized default ensures predictable behavior and interoperability in multi-vendor network environments. A lower priority value is considered more preferential in the root bridge election process.

This is a True/False question. The statement is true, making option A the correct choice.

1. Huawei HCIA-Datacom V1.0 Training Material. (2020). Chapter: "Spanning Tree Protocol", Section: "STP Basic Concepts". This section explicitly states that the default bridge priority of a device running STP is 32768.

2. Huawei VRP V800R012C00 Command Reference. (2018). Document for S Series Switches, Command: stp priority. The command description confirms that the default priority value is 32768.

The statement is correct. In a Layer 2 switched network, a loop in the topology without a loop-prevention mechanism like Spanning Tree Protocol (STP) will cause broadcast, unknown unicast, and multicast frames to be forwarded endlessly between switches. This continuous circulation of frames rapidly consumes available bandwidth and switch CPU resources, leading to a network outage known as a broadcast storm.

This question is a "TRUE OR FALSE" type. The provided statement is factually correct according to fundamental networking principles, so the "False" option would be incorrect.

1. Huawei, "HCIA-Datacom V1.0 Training Material," Document Version V1.0, Chapter: "Spanning Tree Protocol," Section: "Background of STP." This section explicitly describes how Layer 2 loops lead to broadcast storms, MAC address table instability, and duplicate frame transmission.

2. Kurose, J. F., & Ross, K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson. Chapter 6, "The Link Layer and LANs," discusses the function of link-layer switches and the problem of forwarding loops, which necessitate protocols like STP.

The statement is incorrect. The "Protocol" field in the IPv4 header identifies the next-level protocol encapsulated within the IP datagram. According to the Internet Assigned Numbers Authority (IANA), the assigned protocol number for the User Datagram Protocol (UDP) is 17. The protocol number 6 is reserved for the Transmission Control Protocol (TCP). Therefore, if the transport-layer protocol is UDP, the value in the network layer's "Protocol" field must be 17, not 6.

This is a True/False question. The statement is factually incorrect as the protocol number for UDP is 17. The number 6 corresponds to TCP.

1. Postel, J. (1981). RFC 791: Internet Protocol. Internet Engineering Task Force. Section 3.1, "Header Format". This document defines the Protocol field in the IPv4 header.

2. Postel, J. (1980). RFC 768: User Datagram Protocol. Internet Engineering Task Force. This document defines UDP.

3. Internet Assigned Numbers Authority (IANA), "Protocol Numbers". The official registry lists UDP as protocol number 17 and TCP as protocol number 6.

SNMPv3 was specifically designed to address the significant security weaknesses of SNMPv1 and SNMPv2c. Its architecture is built around a modular framework that introduces robust security and enhanced administration capabilities.

Security: SNMPv3's User-based Security Model (USM) provides message integrity (preventing tampering), authentication (verifying the source), and encryption (ensuring privacy of the data). This is a major enhancement over the clear-text community strings used in earlier versions.

Administration: SNMPv3 provides a more flexible administrative framework, including the View-based Access Control Model (VACM), which allows for granular control over which users can access which parts of the Management Information Base (MIB). The concepts of notification originators and proxy forwarders are also integral parts of this advanced administrative structure.

A. SNMPv2c: This version still relies on the insecure community-string-based security model from SNMPv1. It does not offer authentication or encryption.

B. SNMPv1: This is the original version and has the most basic security, using only a clear-text community string for access, which provides no real security.

D. SNMPv2: This refers to the collection of standards that includes SNMPv2c. Like SNMPv2c, it lacks the security features described in the question.

1. Huawei. (2020). HCIA-Datacom V1.0 Training Material (H12-811). Section: Network Management and O&M, Subsection: SNMP Versions. "SNMPv3 provides encryption and authentication functions based on the User-based Security Model (USM) and access control functions based on the View-based Access Control Model (VACM). It is the most secure version."

2. Blumenthal, U., & Wijnen, B. (Eds.). (2002). RFC 3411: An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks. IETF. This document provides an overview of the SNMPv3 architecture, explicitly detailing its focus on security and administration.

3. Wijnen, B., Presuhn, R., & McCloghrie, K. (Eds.). (2002). RFC 3414: User-Based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3). IETF. This RFC specifies the security model for SNMPv3, detailing the mechanisms for authentication and privacy (encryption).

802.3ad link aggregation combines several physical Ethernet links into a single logical channel. Aggregation distributes frames across member links (load-balancing), sums the bandwidth of the links (higher throughput), and keeps traffic flowing when a member fails (reliability/ redundancy). It does not add any intrinsic security features; the security posture is unchanged.

D. Improves neither encryption nor authentication; aggregation only groups links.

1. Huawei S-Series Switches Configuration Guide – Ethernet Link Aggregation, 7.0, §1.1 “Advantages” (bandwidth, load balancing, reliability).

2. IEEE 802.3ad-2000, Clause 43 “Objectives of aggregation”.