NSE4 · Question #353
When using WPAD DNS method, what is the FQDN format that browsers use to query the DNS server?
The correct answer is A. wpad.<local-domain>. When utilizing the WPAD DNS method, web browsers query the DNS server for a host with the FQDN format of wpad.<local-domain> to locate the proxy configuration file.
Question
When using WPAD DNS method, what is the FQDN format that browsers use to query the DNS server?
Options
- Awpad.<local-domain>
- Bsrv_tcp.wpad.<local-domain>
- Csrv_proxy.<local-domain>/wpad.dat
- Dproxy.<local-domain>.wpad
How the community answered
(22 responses)- A91% (20)
- B5% (1)
- D5% (1)
Why each option
When utilizing the WPAD DNS method, web browsers query the DNS server for a host with the FQDN format of `wpad.<local-domain>` to locate the proxy configuration file.
The WPAD DNS discovery method specifies that client browsers attempt to locate the proxy auto-configuration (PAC) file by querying DNS for a host named "wpad" within their local domain, resulting in the FQDN `wpad.<local-domain>`.
The FQDN format `srv_tcp.wpad.<local-domain>` is not the standard used by browsers for WPAD DNS queries; WPAD uses a direct host lookup.
This format resembles a service record or a URL path but is not the FQDN used for the initial DNS query in the WPAD DNS method.
The FQDN format `proxy.<local-domain>.wpad` is incorrect; the standard for WPAD DNS discovery places "wpad" as the hostname component.
Concept tested: WPAD DNS discovery FQDN
Source: https://learn.microsoft.com/en-us/deployedge/edge-wpad
Topics
Community Discussion
No community discussion yet for this question.