Huawei H12-711_V4.0 Dumps

In Huawei firewall hot standby, the heartbeat link is mainly used to maintain the backup relationship and monitor peer status. Through this link, the two firewalls periodically exchange heartbeat packets to confirm whether the peer device is alive and operating normally. This makes statement B correct. The heartbeat link also carries VGMP-related packets , which help the devices determine their active or standby roles and decide whether a switchover is necessary when faults or status changes occur. Therefore, statement C is also correct.

In addition, the firewalls can exchange configuration consistency check information to verify whether key configurations on both devices match, so statement D is correct as well.

The incorrect statement is A . Configuration and status synchronization between hot standby firewalls is not described simply as heartbeat packets being used to synchronize configuration commands and status information. Heartbeat packets are mainly for liveness detection and status maintenance , while configuration or session synchronization is handled by dedicated hot standby synchronization mechanisms rather than ordinary heartbeat packets themselves. Therefore, A is the incorrect statement.

Explanation From HCIA-Security documents:

A traditional packet filtering firewall mainly makes forwarding decisions based on information in the packet header, typically using fields such as source/destination IP address, protocol type, and for TCP/UDP traffic the source/destination port numbers in the transport-layer header. This works well for non-fragmented packets, because the IP header and the complete transport-layer header are present, and it can also work for initial fragments because the first fragment usually contains the transport-layer header (including ports) along with the IP header.

However, non-initial fragments (fragments after the first one) usually contain only the IP header and a continuation of the payload, but do not include the TCP/UDP header where port numbers and some key identifying fields exist. Because a packet filtering firewall relies on these transport-layer fields to match many rules, it cannot accurately apply port-based filtering to non-initial fragments. This limitation is why fragmentation can be abused to bypass basic filtering, and why more advanced firewalls/IPS features include fragment reassembly and deeper inspection. Therefore, non-initial fragments are the type that cannot be effectively filtered by a packet filtering firewall.

Explanation From HCIA-Security documents:

A SYN flood attack exploits the TCP three-way handshake mechanism by sending a large number of SYN packets without completing the handshake, causing the server or firewall to maintain excessive half-open connections and exhaust resources. Huawei firewalls provide multiple defense mechanisms at the TCP protocol level to mitigate this threat.

First, limiting the TCP connection establishment rate restricts how many new SYN requests are processed per second, preventing abnormal surges from consuming system resources. Second, limiting the number of half-open TCP connections ensures that the firewall does not allocate excessive memory and session table entries for incomplete handshakes, thereby protecting against resource exhaustion. Third, SYN cookie technology allows the firewall to avoid storing connection state information until the handshake is properly completed, effectively resisting SYN flood attacks without consuming large amounts of memory.

Interzone security policies primarily control traffic access based on zones and rules; they are not specifically designed as a SYN flood defense mechanism. Therefore, A, B, and C are correct.

Explanation From HCIA-Security documents:

L2TP is a Layer 2 tunneling protocol designed to carry PPP frames across an IP network by encapsulating them inside L2TP tunnels. That’s why statement B is correct: L2TP’s job is to transport PPP traffic through a tunnel between an L2TP Access Concentrator and an L2TP Network Server. In typical remote-access VPN use, employees connect from outside (hotel, home, mobile network) and reach internal resources through the VPN, so A and D match common deployment scenarios.

The incorrect statement is C because PPP is not routable over the public Internet by itself. PPP was originally meant for point-to-point links (like dial-up or serial links). On an IP network such as the Internet, PPP frames must be encapsulated by a method like L2TP (often paired with IPsec for confidentiality and integrity) or converted via technologies such as PPPoE/PPPoA for specific access networks.

Explanation From HCIA-Security documents:

PKI is designed to solve trust and security problems in digital communications by using certificates, public/private keys, and signature mechanisms. It helps parties verify each other’s identities through certificate-based authentication, so B is a classic problem PKI addresses. PKI also enables secure key distribution and supports security protocols that provide confidentiality and integrity , which helps protect data against eavesdropping and tampering during transmission, so C is also within PKI’s scope. In addition, PKI supports digital signatures and non-repudiation-style evidence, which can replace or supplement paper receipts by creating verifiable transaction records, making D something PKI can help with in electronic transactions.

However, network congestion and service degradation due to heavy traffic (A) is a performance and capacity issue. PKI does not reduce traffic load, increase bandwidth, optimize routing, or fix server resource bottlenecks. Those problems are handled through network engineering measures such as QoS, scaling, load balancing, and capacity planning—not by PKI. Therefore, the correct answer is A .

Explanation From HCIA-Security documents:

In IKEv1 Phase 1 aggressive mode, the negotiation completes in three messages, unlike main mode which uses six.

Message 1 (Initiator → Responder): Contains the IKE proposal, Diffie-Hellman public value, nonce, and the initiator’s identity information.

Message 2 (Responder → Initiator): Returns the selected proposal, responder’s Diffie-Hellman public value, nonce, identity information, and authentication data. At this stage, the initiator can authenticate the responder.

Message 3 (Initiator → Responder): Carries the initiator’s authentication data, allowing the responder to verify and authenticate the initiator.

Therefore, the primary function of message 3 is to provide authentication information so that the responder can confirm the identity of the initiator.

Options A and B correspond to earlier negotiation steps, and C describes part of message 2. Hence, the correct answer is D.

The incorrect statements are A and C .

A router works at the network layer and is used to connect different networks. By default, a router separates broadcast domains , because broadcasts are not forwarded from one interface to another. At the same time, each router interface also represents an independent network segment, so routers effectively separate collision domains as well. Therefore, the statement that routers can isolate broadcast domains but not collision domains is incorrect.

A Layer 2 switch works at the data link layer. Each switch port forms a separate collision domain , which is why switches can isolate collision domains. However, by default, all ports in the same VLAN still belong to the same broadcast domain , so switches forward broadcast traffic out all relevant ports. That makes statement B correct and statement D correct.

Statement C is incorrect because routers generally do not forward broadcast packets . Preventing broadcast propagation between networks is one of the key differences between routers and switches. Therefore, the incorrect options are A and C .

Explanation From HCIA-Security documents:

TCP is a connection-oriented transport protocol, so it must establish a reliable session before user data can be exchanged. To create the session, TCP uses the three-way handshake: the initiator sends a SYN to request a connection and advertise its initial sequence number, the responder replies with SYN/ACK to acknowledge the request and provide its own initial sequence number, and finally the initiator sends an ACK to confirm receipt. This process confirms bidirectional reachability, synchronizes sequence numbers, and prepares both ends for reliable delivery, retransmission control, and flow control.

To end a TCP connection gracefully, TCP performs an orderly close in both directions (full-duplex). One endpoint sends FIN to indicate it has no more data to send, the peer responds with ACK . When the peer is also ready to stop sending, it transmits its own FIN , and the original endpoint responds with a final ACK . Because each direction is closed independently, termination is typically described as a four-way handshake .

By default, a firewall’s security policy is mainly used to control unicast traffic between security zones. Unicast packets are the normal one-to-one communication packets exchanged between a single source host and a single destination host. Because most user service traffic, such as web access, file transfer, remote login, and application communication, is carried in unicast form, firewall security policies are primarily designed to inspect and control this type of traffic.

Broadcast packets are typically used for local network discovery or service announcements within the same broadcast domain, and they are not the standard focus of interzone security policy control. Multicast traffic is one-to-many communication and usually requires additional multicast-specific handling or routing mechanisms rather than ordinary default security policy treatment. Anycast is a special addressing and routing method rather than the usual packet-control category emphasized in firewall default policy behavior.

In Huawei firewall policy design, when administrators configure permit or deny rules between zones, those rules are generally intended to manage unicast service traffic . Therefore, among the options listed, the packet type controlled by a firewall’s security policy by default is Unicast .

Explanation From HCIA-Security documents:

In the TCP/IP and OSI reference models, the transport layer is responsible for end-to-end communication between hosts. It provides services such as segmentation, multiplexing through port numbers, and (depending on the protocol) reliability, flow control, and congestion control. The two core transport layer protocols are TCP and UDP.

TCP is connection-oriented and reliable: it establishes a session using the three-way handshake, uses sequence numbers and acknowledgments for retransmission, and supports flow and congestion control to ensure ordered delivery. UDP is connectionless and best-effort: it does not build a session or guarantee delivery, which makes it lightweight and suitable for scenarios such as voice/video streaming and simple query/response services.

By contrast, FTP and DHCP are application layer protocols. FTP provides file transfer services and runs over TCP ports, while DHCP provides dynamic IP address assignment and uses UDP at the transport layer but is itself an application-layer protocol. Therefore, the transport-layer protocols in the options are UDP and TCP.

Protocol identification and analysis

Application data reassembly

Signature matching

Attack response

The correct IPS processing order starts with protocol identification and analysis . Before an IPS can judge whether traffic is malicious, it must first determine what protocol is being used and analyze the packet structure according to the expected protocol behavior. This helps the device understand whether the traffic is HTTP, FTP, SMTP, DNS, or another protocol and prepares it for deeper inspection.

After that, the IPS performs application data reassembly . Many attacks are not visible in a single packet, so the IPS must reconstruct fragmented or segmented traffic into complete application data. This allows the device to inspect the real payload content rather than isolated packet pieces.

Once the data is reassembled, the IPS performs signature matching . At this stage, the traffic content and behavior are compared with known attack signatures, protocol anomalies, and detection rules to determine whether the traffic matches a malicious pattern such as injection, buffer overflow, or directory traversal.

Finally, the IPS performs the attack response . Based on the detection result, it may permit, block, reset, alarm, or log the traffic. Therefore, the correct order is D → A → B → C .

Explanation From HCIA-Security documents:

PKI is mainly used where digital certificates are needed to prove identity, distribute public keys safely, and support functions such as authentication, encryption, and digital signatures . HTTPS web login relies on server certificates (and sometimes client certificates) to build trust and establish encrypted sessions, so D is a classic PKI scenario. SSL VPN also typically uses certificates for gateway identity and often for user/device authentication, so A fits PKI usage as well. IPv6 SEND Secure Neighbor Discovery uses cryptographic mechanisms (such as CGA and signature-based protection) that depend on certificates, making C another PKI-related scenario.

By contrast, IPsec VPN does not necessarily depend on PKI in all deployments. IPsec can authenticate peers using pre-shared keys or other methods without certificates, so it is commonly treated as not strictly a PKI application scenario in basic classification questions. In many training outlines, PKI scenarios are highlighted as HTTPS, SSL VPN, and IPv6 SEND, while IPsec is presented as a separate VPN technology that may or may not integrate certificates. Therefore, the best answer is B .

Explanation From HCIA-Security documents:

Huawei firewalls use security zones to classify interfaces and apply interzone access control and security policies. Some zones are predefined default zones that are built into the system to represent common network roles, such as Trust and Untrust. These default zones are foundational for typical deployments and are generally not allowed to be deleted, because many policy and security mechanisms rely on them as standard references.

In contrast, DMZ is commonly used as a semi-trusted zone for servers that must be reachable from the Internet while still being isolated from the internal network. On Huawei firewalls, DMZ is treated as a configurable zone: administrators can create it when needed, remove it when it is not required, and adjust its priority value so that zone-based matching and policy selection behave as intended in multi-zone deployments.

“ISP” is not a standard default security zone name in the typical Huawei firewall zone model presented at HCIA level. Therefore, among the options, DMZ is the zone that can be deleted and whose priority can be reconfigured.

Explanation From HCIA-Security documents:

On Huawei firewalls, a physical interface such as GE0/0/1 can be split into multiple sub-interfaces to support VLAN-based networking. Each sub-interface can be configured with an 802.1Q VLAN tag, allowing a single physical port to carry traffic for multiple VLANs (trunk-style access). This is commonly used when the firewall must provide Layer 3 gateway or security control for several VLANs over one uplink.

The statement becomes incorrect because sub-interfaces can be assigned to security zones. In Huawei’s zone-based policy model, security zones are logical groupings of interfaces used for policy enforcement, NAT direction, and security inspection decisions. A sub-interface behaves like an independent logical interface: it has its own IP configuration (if used at Layer 3), can participate in routing, and can be placed into a specific security zone just like a physical interface. This is necessary so that traffic between VLANs (mapped to different sub-interfaces) can be controlled using interzone security policies. Therefore, the claim that sub-interfaces cannot be added to security zones is false.

The correct answer is D . In Single Sign-On deployment on Huawei firewalls, the firewall commonly acts as the access control enforcement point , while the actual user authentication is performed by an external or third-party authentication server, such as an LDAP, RADIUS, or other identity system. In this process, the user may enter credentials through the firewall’s Portal page, but the firewall forwards the authentication information to the authentication server rather than locally storing and validating the password itself.

Option A is incorrect because SSO is not based on the firewall storing passwords and independently authenticating users. Option B is also incorrect because it describes a model where the firewall merely records identity and does not participate, while in practice the firewall participates in the access control and authentication interaction workflow. Option C describes an SMS-style verification process, which is not the essential mechanism being tested for SSO here.

Therefore, the correct SSO description is that the firewall receives the credentials, forwards them to a third-party authentication server, and the actual authentication is completed on that server.

This statement is TRUE . In VRRP, a device in a virtual router group can exist in three defined states : Initialize , Master , and Backup . These states determine how the device participates in gateway redundancy and packet forwarding.

The Initialize state is the beginning state of a VRRP router. In this state, the device is not yet acting as the active virtual gateway and is preparing to participate in the VRRP election process. After VRRP negotiation or election, one router becomes the Master . The Master router owns the virtual IP address for the group, forwards user traffic sent to that virtual gateway, and periodically sends VRRP advertisement packets to inform the other routers that it is operating normally.

The other routers remain in the Backup state. Backup routers do not normally forward traffic for the virtual gateway, but they continuously monitor the Master’s advertisements. If the Master fails or stops sending advertisements within the expected time, one of the Backup routers is elected to take over and become the new Master. This failover mechanism ensures default gateway redundancy , reduces service interruption, and improves network reliability. Therefore, the statement is correct.

Explanation From HCIA-Security documents:

3-tuple NAT is used to publish internal services to external users by translating destination IP address, destination port, and protocol so that an Internet user can reach an intranet server using a public address and specific service port. So the first part of the statement about enabling proactive external access through translated addresses and ports matches what 3-tuple NAT is used for.

However, NAT translation and firewall access control are two different functions. NAT only defines how addresses and ports are translated; it does not replace the firewall’s security policy decision. On a Huawei firewall, whether a packet is allowed to pass is determined by the configured security policy (interzone policy). If no relevant security policy exists to permit the traffic from the external zone to the internal zone and the mapped service, the firewall will not automatically allow it just because a NAT mapping is present.

Therefore, without an appropriate permit security policy, the access packets will be denied even if 3-tuple NAT is configured.

This statement is TRUE . When an administrator logs in to a device through the web UI over HTTPS , the device acts as the HTTPS server and presents a local certificate to the web browser during the TLS handshake. If this certificate is issued by a CA trusted by the browser , the browser can verify the certificate chain, confirm the identity of the device, and establish an encrypted session without certificate warning messages.

This process improves security in two important ways. First, it provides server identity authentication , which helps the administrator confirm that the browser is connected to the legitimate device rather than an impersonated or spoofed host. Second, once the certificate is trusted and the TLS session is established, the communication is encrypted and protected for integrity , which reduces the risk of eavesdropping, tampering, and man-in-the-middle attacks during administrator login.

If a trusted CA certificate is not used, administrators may see browser warnings and may not be able to reliably confirm the server identity. Therefore, configuring a CA-issued certificate for HTTPS management helps prevent malicious attacks and ensures more secure administrator access.