H12-725_V4.0 HCIP-Security V4.0 Exam Questions and Answers

Comprehensive and Detailed Explanation:

Health check ensures network reliability by detecting link failures.

Supports multiple protocols : ICMP, TCP, UDP, DNS, and HTTP.

Works with PBR (Policy-Based Routing) :

Health check monitors link status , and if a failure is detected, PBR dynamically switches to an alternate path .

Why is C false?

Health check CAN be used with PBR to ensure traffic is routed via healthy links.

HCIP-Security References:

Huawei HCIP-Security Guide → Health Check Configuration

Comprehensive and Detailed Explanation:

Huawei's Anti-DDoS solution has three core components:

A. Detecting center → Monitors and detects attack traffic.

B. Management center → Controls and configures security policies.

D. Cleaning center → Mitigates attack traffic and allows normal traffic.

Why is C incorrect?

"Zone" is not a specific Huawei Anti-DDoS component.

HCIP-Security References:

Huawei HCIP-Security Guide → Anti-DDoS System Components

Comprehensive and Detailed Explanation:

RADIUS and HWTACACS are AAA (Authentication, Authorization, and Accounting) protocols, but they have key differences:

RADIUS → Encrypts only passwords (not the entire message).

HWTACACS → Encrypts the entire packet, providing better security.

Command authorization:

RADIUS does not support command-level authorization.

HWTACACS supports per-command authorization (used in network device access control).

Why is C false?

RADIUS does not authorize configuration commands; HWTACACS does.

HCIP-Security References:

Huawei HCIP-Security Guide → RADIUS vs. HWTACACS

Comprehensive and Detailed Explanation:

SYN scanning is a stealthy technique used to identify open ports on a target system without fully establishing a TCP connection.

How SYN scanning works:

The scanner sends a SYN packet to the target port.

The target responds based on the port state:

SYN-ACK → Port is open (Correct - D).

RST → Port is closed (Correct - A).

No response → The host does not exist, or a firewall is blocking it (Correct - B).

The scanner does not send an ACK (unlike a full TCP connection). Instead, it sends an RST to avoid detection.

Why is C incorrect?

In SYN scanning, the scanner does NOT send an ACK to complete the handshake. Instead, it sends an RST to abort the connection.

HCIP-Security References:

Huawei HCIP-Security Guide → SYN Scanning Techniques

Understanding 802.1X Authentication in Wired Networks:

802.1X is a port-based network access control (PNAC) protocol that requires a Layer 2 connection between the supplicant (PC), the authenticator (switch), and the authentication server (e.g., RADIUS server).

In wired networks, 802.1X authentication occurs at the Ethernet switch (Layer 2 device) , which enforces authentication before allowing network access.

Why Must the Network Be Layer 2?

802.1X authentication operates at Layer 2 (Data Link Layer) before any IP-based communication (Layer 3) occurs.

If the authentication device and user terminal were on different Layer 3 networks, the authentication packets (EAPOL - Extensible Authentication Protocol Over LAN) would not be forwarded.

In the figure, the authentication control point is at the aggregation switch , which means the PC and switch must be in the same Layer 2 domain.

Components of 802.1X Authentication in the Figure:

Supplicant (PC) → The device requesting network access.

Authenticator (Aggregation Switch) → The switch controlling access to the network based on authentication results.

Authentication Server (iMaster NCE-Campus & AD Server) → Verifies user credentials and grants or denies access.

Layer 2 Connectivity Requirement → The PC must be in the same Layer 2 network as the Authenticator to communicate via EAPOL.

Why "TRUE" is the Correct Answer:

802.1X authentication is performed before IP addresses are assigned, meaning it can only operate in a Layer 2 network.

EAPOL (Extensible Authentication Protocol Over LAN) messages are not routable and must stay within a single Layer 2 broadcast domain.

In enterprise networks, VLAN-based 802.1X authentication is often used , where authenticated users are assigned to a specific VLAN.

HCIP-Security References:

Huawei HCIP-Security Guide → 802.1X Authentication in Enterprise Networks

Huawei iMaster NCE-Campus Documentation → Authentication Control and NAC Deployment

IEEE 802.1X Standard Documentation → Layer 2 Network Authentication

Comprehensive and Detailed Explanation:

iMaster NCE-Campus functions as multiple authentication servers, including:

Portal Server → For web-based authentication.

RADIUS Server → For centralized authentication and policy enforcement.

HWTACACS Server → For administrative command authorization.

Why is B correct?

iMaster NCE-Campus cannot function as an Active Directory (AD) server. It can integrate with an external AD server but does not replace it.

HCIP-Security References:

Huawei HCIP-Security Guide → iMaster NCE-Campus Authentication

Comprehensive and Detailed Explanation:

iMaster NCE-Campus authentication supports multi-condition matching:

Account information (e.g., username, password, role-based policies).

SSID information (specific Wi-Fi network authentication).

Terminal IP address ranges (assigns different policies based on network segments).

Why is this statement true?

Multiple authentication conditions can be applied simultaneously to enforce flexible access control.

HCIP-Security References:

Huawei HCIP-Security Guide → iMaster NCE-Campus Authentication Policy

Comprehensive and Detailed Explanation:

Network Access Control (NAC) and AAA work together for secure network access.

Key functions:

A. AAA handles user-to-device authentication.

B. NAC handles device-to-server authentication.

C. NAC supports 802.1X, MAC authentication, and Portal authentication.

D. AAA enforces authentication, authorization, and accounting.

Why are all options correct?

Each option correctly describes a function of NAC or AAA.

HCIP-Security References:

Huawei HCIP-Security Guide → NAC & AAA Integration

Comprehensive and Detailed Explanation:

Huawei firewalls come with a built-in URL filtering database , which includes predefined categories such as:

Malicious websites

Phishing sites

Social media

Business services

The URL category database is periodically updated by Huawei , ensuring that new threats are detected automatically.

Why is this statement true?

Administrators do not need to manually load URL categories ; they are delivered with the firewall and updated regularly.

HCIP-Security References:

Huawei HCIP-Security Guide → URL Filtering & Web Security

What is IKE DPD (Dead Peer Detection)?

IKE DPD (Dead Peer Detection) is a mechanism used in IPsec VPNs to check if a remote VPN peer is still reachable.

It allows the firewall to detect link failures and automatically tear down and re-establish IPsec tunnels when necessary.

Why is DPD required in this scenario?

The network uses an active/standby link setup :

IPsec Tunnel 1 (Active) → Uses Link 1 (GE0/0/1).

IPsec Tunnel 2 (Standby) → Uses Link 2 (GE0/0/2).

If Link 1 fails , the firewall must detect the failure and tear down IPsec Tunnel 1 before establishing IPsec Tunnel 2 over Link 2 .

DPD detects unreachable peers and triggers a failover.

How does IKE DPD work?

DPD periodically sends probes (HELLO messages) to the remote VPN peer.

If no response is received within a timeout period, the firewall assumes the peer is down.

The firewall deletes the IPsec tunnel and switches to the backup link .

Why is the answer "dpd" (lowercase)?

The question explicitly asks for lowercase letters .

"dpd" (Dead Peer Detection) is the correct technical term in Huawei firewalls and networking standards.

HCIP-Security References:

Huawei HCIP-Security Guide → IPsec VPN High Availability & DPD

Huawei USG Series Firewall Configuration Guide → IKE Dead Peer Detection (DPD)

Comprehensive and Detailed Explanation:

Regular expressions (regex) are used in data filtering to detect patterns in traffic.

* b.d Explanation:

b → The word must start with 'b'.

. * → Matches any number of characters (wildcard).

d → The word must end with 'd'.

Testing the given words:

A. abroad ( ✔ matches) → Starts with "b" but does not end with "d".

B. beside ( ✔ matches) → Starts with "b" but does not end with "d".

C. boring ( ✔ allowed) → Does not start with "b" and end with "d" (safe to post).

D. bad ( ❌ blocked) → Starts with "b" and ends with "d" (matches the regex).

Why is C correct?

"boring" does not match the regex pattern, so it is not blocked.

HCIP-Security References:

Huawei HCIP-Security Guide → Regular Expressions in Data Filtering

Comprehensive and Detailed Explanation:

VLAN authorization in Portal authentication requires additional configuration.

To assign VLANs dynamically:

RADIUS must return VLAN attributes after authentication.

The WAC (Wireless Access Controller) must be configured to support dynamic VLAN assignment.

Why is this statement false?

VLAN authorization requires RADIUS attributes and WAC configuration—it is not automatic.

HCIP-Security References:

Huawei HCIP-Security Guide → WLAN & Portal Authentication

Comprehensive and Detailed Explanation:

Inbound bandwidth = Traffic entering the firewall.

Outbound bandwidth = Traffic leaving the firewall.

Correct answers: B. Public → Private traffic is controlled by inbound bandwidth. D. Private → Public traffic is controlled by outbound bandwidth.

HCIP-Security References:

Huawei HCIP-Security Guide → Firewall Virtual System Bandwidth Control

Comprehensive and Detailed Explanation:

Inbound bandwidth = Traffic entering the firewall.

Outbound bandwidth = Traffic leaving the firewall.

Correct answer:

A. Private → Public traffic is controlled by outbound bandwidth.

Why are the other options incorrect?

B is incorrect because public → private traffic is controlled by inbound bandwidth , not outbound.

C is incorrect because inbound bandwidth does not apply to private → public traffic.

D is incorrect because public → private traffic is controlled by inbound bandwidth.

HCIP-Security References:

Huawei HCIP-Security Guide → Firewall Virtual System Bandwidth Control

Comprehensive and Detailed Explanation:

Aggressive mode is a faster IKE Phase 1 negotiation method but does not support NAT traversal (NAT-T) with AH .

NAT-T only works with ESP , because:

AH includes the original IP header in its integrity check , which breaks when NAT modifies the IP address.

ESP works with NAT-T since it does not include the original IP header in its integrity check.

Why is this statement false?

AH does not support NAT-T , so AH+ESP cannot be used in NAT traversal scenarios .

HCIP-Security References:

Huawei HCIP-Security Guide → IPsec VPN NAT Traversal