300-810 · Question #209
A collaboration engineer is configuring service discovery for Cisco Jabber clients with an on- premises Cisco IM and Presence deployment. Clients on the corporate network are working Clients on the…
The correct answer is B. _collab-edge._tls.example.com external DNS SRV record. Cisco Jabber uses DNS SRV records for automatic service discovery. For clients inside the corporate network, _cisco-uds._tcp is used to find the UCM User Data Service. For clients on the public internet (outside the corporate network), Jabber uses Mobile and Remote Access (MRA)…
Question
A collaboration engineer is configuring service discovery for Cisco Jabber clients with an on- premises Cisco IM and Presence deployment. Clients on the corporate network are working Clients on the public internet cannot locate the corporate services. What must the engineer configure to enable service discovery for these clients?
Options
- A_collab-edge._tcp.example.com external DNS SRV record
- B_collab-edge._tls.example.com external DNS SRV record
- C_cisco-uds._tcp.example.com external DNS SRV record
- D_cisco-uds._tls.example.com external DNS SRV record
How the community answered
(19 responses)- A5% (1)
- B89% (17)
- D5% (1)
Explanation
Cisco Jabber uses DNS SRV records for automatic service discovery. For clients inside the corporate network, _cisco-uds._tcp is used to find the UCM User Data Service. For clients on the public internet (outside the corporate network), Jabber uses Mobile and Remote Access (MRA) via Cisco Expressway. The external DNS SRV record _collab-edge._tls.example.com points Jabber to the Expressway-E server, which proxies the connection securely using TLS. The _collab-edge record specifically uses the _tls transport label (not _tcp) because TLS is mandatory for MRA. Options using _cisco-uds are for internal discovery only, and _collab-edge._tcp is not a valid or used record format.
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