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

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 .

In LDAP, a Distinguished Name or DN is used to uniquely identify an entry in the directory tree. The DN is composed of a sequence of attribute-value pairs that describe the exact location of an object within the LDAP directory hierarchy. Common attributes used in a DN include CN , DC , and OU .

CN stands for Common Name and is often used to identify a specific user, host, or object. OU stands for Organizational Unit and is used to represent a department or subdivision within the directory structure. DC stands for Domain Component and is commonly used to describe parts of a domain name, such as dc=example,dc=com .

On the other hand, DIT stands for Directory Information Tree . It refers to the overall hierarchical structure of the LDAP directory, not an attribute contained inside a DN. In other words, DIT describes the tree itself, while CN, OU, and DC are actual naming attributes used to build the DN of an LDAP object.

Therefore, the correct attributes contained in the DN are CN, DC, and OU .

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 .

This statement is correct because it accurately reflects the basic objective of information security. In HCIA-Security, information security is concerned with protecting information assets and the systems that store, process, and transmit them. These assets include hardware devices, software platforms, network resources, and the data itself. The purpose is to prevent unauthorized access, accidental loss, malicious tampering, disclosure, destruction, or interruption of services.

Information security is not limited to confidentiality alone. It also includes maintaining integrity , which means preventing unauthorized modification of data, and availability , which means ensuring that systems and services remain usable and continuous for authorized users. In practical terms, this means using controls such as access management, firewalls, intrusion prevention, antivirus protection, encryption, backup, authentication, and monitoring to reduce both accidental and intentional threats.

The phrase about ensuring proper system running and uninterrupted information services also matches the availability goal of security. Therefore, the statement correctly describes the overall aim of information security and is TRUE .

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.

Intrusion Prevention (IPS) detects and blocks attacks primarily by analyzing traffic patterns and payload characteristics against known signatures, protocol anomalies, and behavioral rules. Many common application-layer exploits have recognizable request structures that IPS engines can match.

An injection attack (such as SQL injection or command injection) typically contains suspicious characters, keywords, and abnormal parameter patterns within application requests. IPS signatures can detect these malicious payload characteristics and either block the session or generate alarms. Directory traversal attacks also have distinct patterns, such as attempts to access unauthorized paths using sequences like ../ (or encoded variants). These are classic web-attack signatures commonly covered by IPS rule sets. Buffer overflow attacks often exploit protocol or application parsing weaknesses by sending overly long fields, malformed headers, or abnormal protocol sequences; IPS can detect these through signature matching and protocol anomaly detection.

A Trojan horse , however, is malware residing on an endpoint (often delivered via files, email attachments, downloads, or user execution). While some network security features (like antivirus/URL filtering/sandboxing) may detect Trojan delivery or command-and-control traffic, “Trojan horse” itself is not typically classified as an IPS-detected attack type in this context. Therefore, A, B, and D are correct.

Explanation From HCIA-Security documents:

In a typical PKI workflow, the CA is mainly responsible for certificate issuance and lifecycle management, but it usually does not handle direct identity verification for most end users. Instead, the user submits a certificate application request (often a CSR) through a defined enrollment channel, and the RA performs the key step of validating the requester’s identity and authorization according to the organization’s certificate policy. After the RA approves the request, it is forwarded to the CA for signing and issuance. This separation of duties improves security and scalability: the CA stays protected and focused on signing operations, while the RA enforces registration, approval, and identity-proofing processes close to the user or business unit.

Therefore, saying “in most cases the user applies to the CA and the CA approves the application” is inaccurate in standard enterprise PKI designs. The CA issues the certificate, but approval and verification are commonly handled by the RA, with the CA acting on the RA’s validated decision.

Security zones are used to classify interfaces by trust level and simplify policy control. Traffic control decisions are usually applied between zones (interzone), and many firewall products (including Huawei) treat intrazone traffic differently from interzone traffic. Typically, communications between hosts within the same zone are not the primary target of security policy control, and mutual access within a zone does not have to be explicitly permitted by security policies in the same way as traffic between different zones. Therefore, statement A is correct in the context of zone-based policy control.

Firewall policies are created with a source zone and destination zone (and other match conditions), and they can be written to allow traffic in a specific direction (for example, Trust → Untrust) while denying the reverse direction (Untrust → Trust). That makes statement B correct: policies can be directional.

Statement C is incorrect because Huawei firewalls also include a default Local zone in addition to Trust, Untrust, and DMZ. Statement D is incorrect because an interface (or sub-interface) is assigned to one security zone; assigning the same interface to multiple zones would break the trust-boundary model and policy evaluation.

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 .

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.

In Huawei firewall hot standby and reliability deployment, the VGMP group can operate in several different states that reflect the working role of a device in the backup system. These states are used to identify whether a device is currently forwarding service traffic, waiting as a backup device, balancing traffic, or still in the startup phase.

Initialize refers to the initialization state, in which the VGMP group has not yet fully completed role negotiation or status establishment. Active indicates that the firewall is currently the primary device responsible for forwarding traffic and providing services. Standby means the firewall serves as the backup device, ready to take over if the active device fails. Load-balance is used in scenarios where traffic is distributed between devices according to the load-balancing mechanism rather than relying on only one active forwarding device.

These VGMP status values help administrators understand device roles and cluster behavior during deployment, failover, and service switching. Since all four listed items are recognized VGMP group states in Huawei firewall high availability scenarios, A, B, C, and D are all correct .

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.

Explanation From HCIA-Security documents:

AAA provides a unified framework for Authentication, Authorization, and Accounting, and on Huawei devices the AAA authentication method can be selected according to the management and deployment requirements. Local authentication uses user accounts stored on the device itself, which is suitable for small environments, emergency access, or when external servers are unavailable. RADIUS authentication relies on a centralized RADIUS server, commonly used for large-scale user access control and unified credential management. HWTACACS authentication is another centralized mode that supports fine-grained control and is often preferred in scenarios requiring stronger separation of authentication and authorization, as well as detailed command-level management in some deployments. In addition, AAA can be configured for no authentication (also called none), meaning the device does not verify user identity for a specific access scenario. This mode is typically used only in controlled environments or for specific services where authentication is handled elsewhere, because it reduces security. Therefore, all listed modes are supported by AAA.

A. Scanning attacks → Attackers use ICMP packets to probe the target IP address to identify active hosts that connect to the target network.

B. Malformed packet attacks → Attackers send considerable malformed packets in an attempt to crash targeted hosts or servers.

C. Special packet control attacks → Such attacks are reconnaissance activities for attacks but not real attacks. That is, attackers send special packets to probe network structures.

In HCIA-Security, single-packet attacks are commonly categorized by the purpose and structure of the packets being sent. Scanning attacks are mainly used to discover targets and collect information before a real attack begins. A common example is using ICMP probe packets to identify whether hosts are alive and reachable on a network. This makes the ICMP host-discovery description the correct match for scanning attacks.

Malformed packet attacks involve sending packets with abnormal, invalid, or deliberately corrupted structures. Their purpose is to exploit weaknesses in protocol handling or operating system processing so that the target host, device, or server becomes unstable, crashes, or stops responding. Therefore, the description about sending many malformed packets to crash targets clearly matches this category.

Special packet control attacks are also more related to probing than direct destruction. In this case, attackers send specially crafted control or probe packets to learn network structure, device behavior, or service characteristics. These activities are considered reconnaissance rather than full attacks. That is why the description about probing network structures with special packets belongs to special packet control attacks.

Explanation From HCIA-Security documents:

The question describes a NAT mode that does two things at the same time:

it translates IP addresses and port numbers (so multiple internal hosts can share one public address), and

it specifically uses the public IP address of the outbound interface as the translated address.

That combination matches Easy IP. Easy IP is essentially a convenient form of source NAT/PAT where the device automatically uses the egress interface’s public IP as the post-NAT source address and differentiates internal sessions by translating source ports. This is widely used when an enterprise has one public IP on the WAN interface and many intranet hosts need Internet access.

NAPT is the general concept of translating both address and port, but it does not inherently require using the outbound interface IP; it can use addresses from a configured public address pool. NAT No-PAT translates only addresses without port translation, so it does not fit. “3-tuple NAT” is not the standard match for the specific “use outbound interface public IP” description. Therefore, the correct answer is Easy IP.

Explanation From HCIA-Security documents:

On a Huawei firewall, a security zone is a logical grouping of interfaces with similar security requirements. An interface can belong to only one security zone at a time , so option A is incorrect. Default zones such as trust, untrust, and local are system-defined and cannot be deleted, which makes B incorrect.

Different security zones are typically assigned different default security levels to define trust relationships and policy direction, so C is also incorrect.

However, multiple physical or logical interfaces can be assigned to the same security zone if they share the same security policy and trust level. For example, several internal LAN interfaces can all be placed in the trust zone, while multiple WAN interfaces can be placed in the untrust zone. Traffic policies are usually applied between zones rather than per interface. Therefore, the correct statement is D

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.

Huawei firewalls use security zones to group interfaces that share the same trust level and security policy requirements. In the default configuration, Huawei firewalls provide four built-in zones that cover the most common deployment scenarios.

Trust represents the internal network where users and servers are typically considered more reliable. Untrust represents external networks such as the Internet, where traffic is considered untrusted and usually requires stricter access control and security inspection. DMZ is designed for semi-public servers (for example, web or mail servers) that must be reachable from Untrust but should be isolated from the Trust network to reduce lateral movement risk if a DMZ host is compromised. Local is a special zone that represents the firewall device itself (management plane and control plane). Traffic destined to or originating from the firewall (such as management access, routing protocol packets, or local services) is associated with the Local zone and is controlled using dedicated policies.

Because these four zones are pre-defined and available by default, all listed options are correct.

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:

HTTPS protects web-based management by combining encryption with server identity authentication . For the browser to trust the device’s HTTPS service, the device must present a server certificate that can be validated by the browser. That is why administrators often configure the device to use a local certificate (the device’s certificate) that is issued by a trusted CA or whose CA chain has been imported into the browser/OS trust store. When the certificate is trusted, the browser can verify the certificate chain, validity period, and hostname binding, which helps prevent attackers from impersonating the device during login.

If a device uses a self-signed or untrusted certificate, the browser shows warnings and users may click through them, increasing the risk of man-in-the-middle attacks and credential theft. Using a CA-trusted certificate strengthens administrator logins by ensuring the management page you connect to is genuinely the intended device and that the session is encrypted end-to-end.