Huawei H12-711_V4.0 HCIA-Security V4.0 Exam Exam Practice Test

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:

On Huawei firewalls, security protection whitelist rules are used to exclude specific traffic objects (such as certain URLs, domains, or application-identification strings, depending on the feature) from being blocked or inspected by security protection mechanisms. To avoid overly broad exemptions, the whitelist provides clear, controllable string matching modes. Commonly supported modes include prefix matching (the protected object begins with the specified string), suffix matching (the protected object ends with the specified string), and keyword matching (the protected object contains the specified keyword). These modes are deterministic and easy to validate, which helps administrators precisely exempt expected legitimate traffic while reducing the risk of accidentally whitelisting unrelated malicious traffic.

“Fuzzy matching” is not used as a whitelist matching mode because it is inherently ambiguous and may cause unintended matches. In security whitelisting, ambiguous matching would weaken protection by making the exemption scope unpredictable. Therefore, among the options provided, fuzzy matching is the one that is not a supported whitelist matching mode.

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:

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.

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:

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.

The correct operation is D because email attachments are a common carrier for malware, phishing payloads, ransomware, Trojans, and malicious scripts. In enterprise security practice, a user should not trust an attachment only because the message looks work-related or appears to come from a company mailbox . Attackers can spoof sender information, disguise malicious content, or compromise legitimate accounts. Therefore, simply checking the content or sender is not enough to ensure safety.

A safer process is to verify the sender and the email details carefully , such as the address, subject, wording, unexpected urgency, and whether the attachment type matches the business context. After that, the attachment should be scanned with antivirus or endpoint security software before opening or saving it. This helps detect known malicious files and reduces the chance of infecting the host or internal network.

Option A is unsafe because work relevance alone does not prove the file is harmless. B is clearly wrong because attachments can directly affect information security. C is also unsafe because internal-looking mail can still be malicious. Therefore, D is the correct answer.

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.

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

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.

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 .

This statement is TRUE . A DMZ is a special security zone used to place servers that must provide services to external users while still being isolated from the internal trusted network. Typical examples include WWW servers, FTP servers, mail servers, and DNS servers . These systems need to be accessible from outside networks such as the Internet, but placing them directly inside the internal network would increase security risk.

The purpose of the DMZ is to create a buffer area between the Untrust zone and the Trust zone. External users can be allowed to access the public-facing servers in the DMZ according to security policies, while access from the DMZ to the internal network can be more strictly restricted. This design helps reduce the chance that an attacker who compromises a public server can directly reach sensitive internal systems.

On Huawei firewalls, the DMZ is one of the default security zones and is specifically intended for such semi-public service devices. Therefore, devices that provide external network services, such as WWW and FTP servers, can correctly be deployed in the DMZ .

Certificate application

Certificate issuing

Certificate storage

Certificate verification

Certificate usage

Certificate update

Certificate revocation

The PKI lifecycle describes the complete process a digital certificate goes through from creation to termination. The first stage is certificate application , where a user or device generates a key pair and submits a certificate request to the certification authority or registration authority.

After the request is approved, the CA performs certificate issuing , which involves creating and signing the certificate using the CA’s private key. Once issued, the certificate must be securely saved on the device, which is the certificate storage phase. Proper storage ensures that the certificate and the associated private key can be safely used when authentication or encryption is required.

Before using a certificate in communication, systems perform certificate verification . This step checks the certificate chain, validity period, and CA signature to confirm that the certificate is trustworthy. After successful verification, the certificate enters the certificate usage phase, where it is used for encryption, authentication, digital signatures, or secure communications such as HTTPS or IPsec.

During its lifetime, a certificate may require certificate update (renewal) when it approaches expiration. Finally, if the certificate becomes invalid or compromised, certificate revocation is performed to terminate its trust before its expiration date.

On a firewall that includes antivirus inspection, the device can take different response actions after it detects malware in traffic (for example, in file transfers, email attachments, or web downloads). Block is a standard antivirus action: the firewall stops the session or drops the infected content to prevent the malicious file from reaching the destination host. Alert (alarm/log) is also a common response action: the firewall generates an event, log, or alarm so administrators can investigate the source, destination, file type, signature name, and policy that triggered the detection.

Some firewall antivirus engines also support content-handling actions such as deleting an attachment (or stripping the infected file/attachment) while allowing the rest of the session to proceed, depending on the protocol and security profile. This is typically used in scenarios like email or file-based protocols where removing the infected payload is feasible.

Declare is not a normal antivirus response action on firewalls; it does not describe a meaningful enforcement or notification behavior. Therefore, the valid antivirus response actions here are Block, Alert, and Delete attachment.

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.

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.

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:

In a PKI, certificate revocation is mainly about requester authentication and approval, not about using one mandatory communication method. The RA is responsible for verifying the applicant’s identity and the legitimacy of the revocation request, then submitting the validated request to the CA. After approval, the CA updates the certificate status, typically by publishing an updated CRL or providing status through OCSP, so relying parties can detect that the certificate is no longer trustworthy.

A “signed and encrypted email” is only one possible way to send a revocation request, but it is not required. In practice, organizations may accept revocation requests through a portal, ticketing system, dedicated PKI management interface, phone with pre-agreed authentication, or other controlled channels. If email is used, digital signature can help prove the requester’s identity and protect integrity, while encryption is optional and depends on policy because the key need is authorization, not confidentiality.

Explanation From HCIA-Security documents:

In ESP transport mode, the authentication function provides data integrity and origin authentication for specific parts of the IP packet. The authentication calculation covers the ESP header, TCP/UDP header, user data, and ESP tail (including padding, Pad Length, and Next Header fields) . However, it does not include the outer IP header, because some IP header fields (such as TTL) may change during packet forwarding. It also does not include the ESP Authentication Data field itself, since that field stores the integrity check value result of the calculation.

In the diagram, range 3 correctly represents the portion starting from the ESP header up to the ESP tail, excluding the IP header and excluding the ESP Authentication Data field.

Range 1 only covers part of the payload, range 2 does not include the ESP header, and range 4 incorrectly includes the IP header. Therefore, option 3 accurately describes the authentication scope of ESP in transport mode.