H12-711_V4.0 HCIA-Security V4.0 Exam Question and Answers

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:

IPsec secures user traffic mainly through the ESP or AH mechanisms, delivering a combination of confidentiality and authentication-related protections. Data encryption (A) provides confidentiality so that intercepted packets cannot be read by unauthorized parties. This is typically delivered by ESP using symmetric encryption algorithms negotiated during IKE.

For authentication, IPsec provides data origin authentication (B) , meaning the receiver can confirm that packets were generated by the expected peer (the holder of the correct IPsec SA and keys). Along with that, IPsec performs a data integrity check (D) so that any modification to the protected portion of a packet in transit is detected; integrity is commonly provided using an HMAC or authenticated encryption method.

Finally, IPsec also includes anti-replay (C) protection. By using sequence numbers and a replay window, the receiver can detect and discard duplicated old packets, which prevents attackers from capturing encrypted/authenticated traffic and retransmitting it to disrupt sessions or attempt misuse.

Because IPsec secure transmission depends on encryption plus authentication, integrity, and replay protection working together, all four options are correct.

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.

Explanation From HCIA-Security documents:

All four statements describe standard PKI roles and structure. A PKI entity is any certificate holder or relying participant that uses PKI services, which includes people, organizations, network devices, servers, and even application processes, so A is correct. PKI trust is commonly built using a CA hierarchy, where the root CA anchors trust and subordinate CAs issue certificates under the root’s authority, so B is correct. The CA is the core trusted component that signs (issues) certificates and manages their lifecycle activities such as renewal, suspension or revocation publication, and certificate status services, so C is correct. In many enterprise implementations, the PKI system is presented as three major roles: entities that request/use certificates, the RA that performs identity verification and approval of requests, and the CA that issues certificates based on validated requests, so D is also correct.

Huawei firewalls are stateful devices. This means they do not evaluate every packet only by static rules; instead, they track communications as sessions and then handle subsequent packets based on the session state. When the first packet of a flow arrives, the firewall matches it against the security policy, performs checks (and NAT if configured), and if allowed, it creates a session entry in the session table. That entry records key information such as source/destination IP addresses, protocol, ports or identifiers, zones, NAT translation information, timeout values, and the current state.

After the session is created, later packets of the same TCP/UDP flow, or related ICMP traffic, are forwarded efficiently by querying the session table first. If a matching session exists and the state is valid, the firewall applies the corresponding actions (permit/deny, NAT mapping, logging, QoS, inspection) without repeating the full policy lookup each time. If no session matches, the firewall treats the packet as a new flow and re-evaluates it against policies. Therefore, the statement is true.

Application-layer protocols provide network services directly to user applications and define how clients and servers exchange application data. DNS is an application-layer protocol used to translate domain names into IP addresses (and perform related record lookups), enabling applications to locate services by name instead of by numeric address. Telnet is also an application-layer protocol that provides remote terminal access; it allows a user to interact with a remote system’s command-line interface over the network (though it is insecure because it transmits data in plaintext). HTTP is an application-layer protocol used for web communication, defining request/response behavior between browsers (clients) and web servers for transferring web pages and related content.

In contrast, ARP is not an application-layer protocol. ARP operates at the boundary of Layer 2/Layer 3 to map an IPv4 address to a MAC address on the local network segment, supporting frame delivery on Ethernet. Therefore, the application-layer protocols here are DNS, Telnet, and HTTP.

Explanation From HCIA-Security documents:

Antivirus software relies heavily on its signature database to identify known malware, suspicious files, and malicious behaviors. Because new threats appear continuously and existing malware is frequently modified to evade detection, the signature library must be updated very often to keep protection effective. Updating every day is the best practice in most enterprise and personal environments, and many antivirus products actually update multiple times per day automatically.

If signatures are updated only monthly , half-monthly , or every three months , there is a large window where newly released malware samples and variants will not be recognized, increasing the chance of infection and successful compromise. Daily updates reduce this exposure window and ensure the antivirus engine has the newest detection patterns, reputation indicators, and sometimes updated heuristic rules released by the vendor.

In addition, daily updates align with operational security expectations: endpoints are exposed to internet content, email attachments, removable media, and downloads on a constant basis, so outdated signatures quickly become a weak link. Therefore, the correct answer is Every day .

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:

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.

This statement is TRUE . On Huawei firewalls, security policies are mainly used to control traffic between different security zones . The firewall determines policy matching based on the source zone and destination zone , and these interzone policies decide whether traffic is permitted or denied.

For traffic between users in the same zone , permit security policies generally do not need to be configured. This is because hosts and interfaces belonging to the same security zone are considered to have the same trust level, and their communication is not normally controlled by interzone security policy rules in the same way as traffic moving from one zone to another. In other words, the main purpose of zoning is to define boundaries between different trust levels, not to force permit rules for communications inside a single zone.

This behavior simplifies firewall policy deployment. Administrators mainly need to focus on policy design for traffic such as Trust to Untrust , Untrust to DMZ , or DMZ to Trust , where different trust levels exist. Therefore, for traffic between users in the same zone , a permit action security policy is generally not required .

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 .

On Huawei firewalls, traffic direction is determined according to the priority of security zones . When traffic moves from a low-priority zone to a high-priority zone , that direction is called Inbound . For example, traffic going from the Untrust zone to the Trust zone is considered inbound because Untrust has a lower security priority than Trust.

By contrast, traffic moving from a high-priority zone to a low-priority zone is called Outbound . A common example is internal users in the Trust zone accessing resources on the Internet in the Untrust zone. This zone-priority concept is important because firewall security policies, packet filtering behavior, and session control are all evaluated according to the source zone and destination zone.

Understanding inbound and outbound directions is essential when configuring interzone security policies. Administrators must know whether traffic is flowing from low to high priority or high to low priority in order to apply the correct permit, deny, NAT, and inspection rules. Since the question specifically asks for the direction from a low-priority zone to a high-priority zone, the correct answer is Inbound .

Huawei firewalls support creating multiple sub-interfaces on a single physical interface such as GE0/0/1 so that one physical link can carry traffic for multiple VLANs. Each sub-interface is configured with an 802.1Q VLAN tag, which allows it to logically represent one VLAN or one Layer 3 gateway interface for that VLAN. This design is commonly used when the firewall connects to a switch through a trunk and needs to provide routing and security control for several VLANs simultaneously.

The statement is incorrect because sub-interfaces can be added to security zones. A security zone is a logical security domain used for policy enforcement, and Huawei firewalls allow both physical interfaces and logical interfaces (including VLAN sub-interfaces) to be assigned to zones. This is essential for implementing interzone security policies between VLANs. For example, if two VLANs are mapped to two different sub-interfaces, placing each sub-interface into a different zone allows the firewall to apply access control, inspection profiles, and NAT based on zone-to-zone rules. Therefore, the claim that sub-interfaces cannot be added to security zones is false.

A packet filtering firewall mainly works by examining the header information of packets and making forwarding or blocking decisions based on predefined rules. Its inspection is primarily focused on the network layer , where it checks information such as the source IP address , destination IP address , protocol type, and related packet header fields. Because of this, the correct answer is Network layer .

Packet filtering firewalls can also use some transport-layer information such as TCP or UDP port numbers in practical policy matching, but their fundamental classification in traditional firewall technology is based on network-layer packet filtering rather than deep inspection of application content. They do not analyze user data in the same detailed way as application-layer gateways or next-generation firewalls.

The physical layer only deals with bit transmission and hardware signaling, so it is not the layer used for packet filtering decisions. The data link layer focuses on MAC addresses and frame transmission within a local segment, while the application layer deals with application protocols such as HTTP, FTP, and DNS. Therefore, for a packet filtering firewall, the correct layer checked is the Network layer .

In IPsec ESP transport mode , the authentication process protects most of the ESP packet except the outer IP header and the authentication data field itself. Specifically, the authentication calculation covers the ESP header, the encrypted payload (such as the TCP header and application data), and the ESP trailer . The IP header is not included , because it may change during packet transmission, and the ESP authentication data field is also excluded because it stores the result of the authentication calculation.

Looking at the packet structure in the figure, the order is: IP Header → ESP Header → TCP Header → Data → ESP Tail → ESP Auth Data . The correct authentication range therefore begins at the ESP header and ends at the ESP tail , but it does not include the IP header or the ESP authentication data.

In the diagram, option 3 represents the range starting from the ESP header and ending at the ESP tail , which matches the actual authentication coverage of ESP in transport mode. Therefore, the correct answer is 3 .