H12-711_V4.0 Sample Questions 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 .

Explanation From HCIA-Security documents:

A packet filtering firewall mainly makes decisions based on L3/L4 header information such as source/destination IP address, protocol, and port, usually through static ACL rules . Because it does not deeply understand application behavior and typically does not track full session state like a stateful inspection firewall, it has several limitations.

A is a disadvantage because basic packet filtering is often implemented as rule-by-rule matching; under heavy traffic or intentionally flooded traffic, performance can degrade and the device may be pressured by DoS-style loads, especially if rules are long or the platform is resource-limited.

B is also a disadvantage: packet filtering that trusts only IP information can be bypassed by IP spoofing in certain scenarios, allowing traffic to appear as if it comes from an allowed address.

C is correct because packet filtering relies on static policies , which struggle to handle dynamic connections, complex services, and fine-grained user-based control.

D is not a disadvantage of packet filtering; dynamic connection status lists are a feature of stateful firewalls, not simple packet filters.

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 .

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.

This statement is TRUE . HTTPS is essentially HTTP running over TLS . While HTTP by itself transmits data in plaintext, HTTPS adds the TLS security layer to protect communication between the client and the server. By introducing TLS, HTTPS provides three important security functions during transmission.

First, it provides identity authentication . The server proves its identity to the client through a digital certificate , helping the client confirm that it is communicating with the legitimate server rather than an attacker. Second, HTTPS provides encryption . After the TLS negotiation process is completed, the transmitted HTTP data is encrypted, preventing attackers from easily reading sensitive information such as usernames, passwords, and session data. Third, HTTPS ensures data integrity . TLS includes mechanisms to detect whether transmitted data has been modified during communication.

Because of these features, HTTPS is widely used for secure web access, online transactions, authentication pages, and confidential information exchange. Therefore, the statement that HTTPS introduces the TLS layer based on HTTP to provide authentication, encryption, and integrity protection is 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.

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 .

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.

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.

Explanation From HCIA-Security documents:

IPS works by identifying malicious traffic patterns and behaviors in network data. An IPS signature is a set of detection rules that describe known attack characteristics, such as specific byte sequences in payloads, abnormal protocol fields, exploit patterns, or behavior indicators that match a recognized threat. When traffic passes through the firewall with IPS enabled, the device performs protocol decoding and (when needed) stream or application data reassembly so it can inspect complete content instead of isolated packets. After that, it compares the reconstructed traffic against the IPS signature database. If a match is found, the firewall determines the traffic is malicious and then takes the configured action, such as blocking packets, resetting the connection, discarding the session, and generating logs/alarms for visibility and auditing. This signature-based comparison is a core detection method of IPS and is why keeping the signature library updated is important: new attack techniques require new or improved signatures. Therefore, the statement is correct: the firewall detects and defends by comparing data flows with IPS signatures.

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:

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:

This scenario states two key conditions: (1) there are only a small number of users accessing the Internet, and (2) the number of available public IP addresses is equal to the number of concurrent Internet users. That means the organization has enough public addresses to assign a dedicated public IP to each internal user at the same time. In such a case, the most suitable NAT type is NAT No-PAT, which is also commonly understood as traditional one-to-one address translation (no port translation). The internal source IP is translated to a unique public source IP, and the transport-layer port number is not multiplexed to share a single public IP among many users.

By contrast, NAPT and Easy IP are used when public addresses are scarce, because they translate multiple internal users to one or a few public IP addresses by also translating port numbers (PAT). 3-tuple NAT is a more specific translation method involving matching/translation with additional parameters, but it is not the standard choice described by the given “equal number of public IPs and concurrent users” condition. Therefore, NAT No-PAT is correct.

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.

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:

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.

The packet capture in the figure shows three TCP packets exchanged between 192.168.1.2 and 192.168.1.1 . The first packet from 192.168.1.2 → 192.168.1.1 contains the [SYN] flag. In TCP communication, the SYN flag indicates that a host is requesting to establish a TCP connection . This is the first step of the TCP three-way handshake process.

The second packet from 192.168.1.1 → 192.168.1.2 contains [SYN, ACK] , meaning the destination host acknowledges the request and agrees to establish the connection while sending its own synchronization request. The third packet from 192.168.1.2 → 192.168.1.1 contains [ACK] , confirming the response and completing the connection establishment process.

This sequence ( SYN → SYN/ACK → ACK ) clearly indicates the TCP connection establishment procedure , not termination. TCP connection termination normally involves FIN and ACK flags rather than SYN.

Although the capture shows ports such as nfs > http , the packets shown only represent the TCP handshake and do not confirm application-layer login activities such as Telnet or HTTP authentication. Therefore, the correct statement is that the terminal is sending a TCP connection establishment request to 192.168.1.1 .

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