The HCIP-Security V4.0 Exam (H12-725_V4.0)

Comprehensive and Detailed Explanation:

Threshold settings in firewalls allow administrators to define:

Alarm threshold → When exceeded, logs are generated.

Block threshold → When exceeded, the action is blocked.

Why is B false?

The alarm threshold does not block traffic; it only generates logs.

Only the block threshold enforces blocking actions.

HCIP-Security References:

Huawei HCIP-Security Guide → HTTP Traffic Control

Comprehensive and Detailed Explanation:

GRE over IPsec is used to tunnel non-IP traffic, multicast, and dynamic routing protocols over IPsec VPN.

Tunnel mode is required because:

Transport mode only encrypts the payload , but GRE needs the entire original IP packet encrypted .

Tunnel mode encrypts the entire packet (original + GRE headers), ensuring full encapsulation.

Why is this statement true?

GRE over IPsec must use tunnel mode to fully encapsulate and protect packets.

HCIP-Security References:

Huawei HCIP-Security Guide → GRE over IPsec Configuration

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:

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:

Portal authentication requires active session monitoring.

User logout can be triggered by multiple methods:

A. Portal server logout → The Portal system forcefully logs out a user.

B. Authentication server logout → The authentication system revokes access.

C. User-initiated logout → The user manually logs out via a Portal page.

D. Access device logout → If the firewall detects inactivity, it can remove the session.

Why are all options correct?

Each method can trigger a user logout in Portal authentication.

HCIP-Security References:

Huawei HCIP-Security Guide → Portal Authentication Logout Mechanisms

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:

Flood attacks (DoS/DDoS) overwhelm network resources , preventing normal users from accessing services.

Correct answers:

A. Exhaust available bandwidth → Large amounts of traffic saturate the network.

B. Exhaust server-side resources → High CPU/memory usage causes server crashes.

D. Exhaust network device resources → Firewalls, routers, and switches become overloaded.

Why is C incorrect?

Controlling host rights is related to hacking, not flooding attacks.

HCIP-Security References:

Huawei HCIP-Security Guide → DoS/DDoS Attack Prevention

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

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POST → Sending Information to the Server

The POST method in HTTP is used to send data to a web server.

Examples include:

Submitting login credentials.

Posting comments or messages on a forum.

Uploading files via web applications.

Unlike GET , POST hides sensitive information in the request body , making it more secure for transmitting login credentials or personal data.

Internet Access Using a Proxy → Firewall Deployment for Proxy Access

A proxy server allows users to access the internet through a controlled gateway .

To enforce security policies, a firewall must be deployed between the intranet and the proxy server .

Proxies are used for:

Content filtering (blocking unwanted websites).

Access control (restricting web usage based on user roles).

Anonymization (hiding the user's original IP address).

File Upload/Download Size → Controlling Upload Limits

Firewalls and security devices can restrict file upload/download sizes to:

Prevent excessive bandwidth usage.

Block potentially malicious file uploads.

Alert and Block Thresholds:

Alert threshold: Logs a warning if a file exceeds a specific size.

Block threshold: Prevents files larger than the configured limit from being uploaded or downloaded.