300-820 · Question #70
300-820 Question #70: Real Exam Question with Answer & Explanation
The correct answer is A: _sips._tcp.example.com. The format of DNS SRV queries for sip (RFC 3263) and H.323 used by Expressway are: _sips._tcp.<fully.qualified.domain> _sip._tcp.<fully.qualified.domain> _sip._udp.<fully.qualified.domain> - not recommended for video calls, only use for audio-only _h323ls._udp.<fully.qualified.do
Question
An organization with a domain name of example.com. Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)
Options
- A_sips._tcp.example.com
- B_sips._udp.example.com
- C_h323ls._udp.example com
- D_h323ls._tcp.example.com
- E_collab-edge._tls.example.com
Explanation
The format of DNS SRV queries for sip (RFC 3263) and H.323 used by Expressway are: _sips._tcp.<fully.qualified.domain> _sip._tcp.<fully.qualified.domain> _sip._udp.<fully.qualified.domain> - not recommended for video calls, only use for audio-only _h323ls._udp.<fully.qualified.domain> - for UDP location (RAS) signaling, such as LRQ _h323cs._tcp.<fully.qualified.domain> - for H.323 call signaling The format of DNS SRV queries for sip (RFC 3263) and H.323 typically used by an endpoint are: _sips._tcp.<fully.qualified.domain> _sip._tcp.<fully.qualified.domain> _sip._udp.<fully.qualified.domain> - not recommended for video calls, only use for audio-only _h323ls._udp.<fully.qualified.domain> - for UDP location (RAS) signaling, such as LRQ _h323cs._tcp.<fully.qualified.domain> - for H.323 call signaling _h323rs._udp.<fully.qualified.domain> - for H.323 registrations
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