H11-811 · Question #238
The authentication modes used during SIP number allocation on the U1900 series gateway include (). (Multiple Choice)
The correct answer is A. No authentication B. by IP C. by password D. by IP and password. On the Huawei U1900 series unified gateway, SIP number allocation supports four authentication modes: No authentication (A), where any device can register freely; by IP (B), where the source IP address is validated; by password (C), where a credential must be provided; and by…
Question
The authentication modes used during SIP number allocation on the U1900 series gateway include (). (Multiple Choice)
Options
- ANo authentication
- Bby IP
- Cby password
- Dby IP and password
- EbyLDAP
How the community answered
(51 responses)- A75% (38)
- E25% (13)
Explanation
On the Huawei U1900 series unified gateway, SIP number allocation supports four authentication modes: No authentication (A), where any device can register freely; by IP (B), where the source IP address is validated; by password (C), where a credential must be provided; and by IP and password (D), a combined/stricter mode requiring both. These four cover the full range of built-in SIP registration security options on this platform.
Option E (LDAP) is incorrect because LDAP is a directory-service protocol used for centralized user management in enterprise systems - while Huawei gateways may integrate LDAP for other purposes (e.g., enterprise address books), it is not one of the defined authentication modes for SIP number allocation on the U1900.
Memory tip: Think of a security dial with four positions - none, IP only, password only, both - representing increasing levels of strictness. LDAP lives in a different "category" (directory services), so it doesn't belong on that dial.
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