Free HCIA-Security V4.0 Exam Practice Questions

Use SSL VPN to access the firewall to trigger authentication → Access user

Use HTTP to access the intranet web server to trigger authentication → Internet access user

Log in to the firewall through Telnet, SSH, or web to trigger authentication → Administrator

These authentication modes correspond to different user roles on a Huawei firewall. An Access user is typically a user who connects to enterprise resources through technologies such as SSL VPN . In this case, the user accesses the firewall as a secure access gateway, and authentication is triggered when the SSL VPN session is initiated.

An Internet access user usually refers to a common end user whose identity must be verified before being allowed to access network resources through the firewall. A common way to trigger this authentication is by using HTTP to access an intranet or web resource , which leads to Portal-based identity verification and access control.

An Administrator is different from ordinary service users because this role is responsible for managing and configuring the firewall itself. Therefore, authentication for an administrator is triggered when the person logs in directly to the firewall through Telnet, SSH, or the web management interface .

So the correct matches are: SSL VPN → Access user , HTTP intranet access → Internet access user , and Telnet/SSH/web login → Administrator .

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.