Wireless Display Standards Explained:
AirPlay, Miracast, WiDi, Chromecast, and DLNA
http://www.howtogeek.com/177145/wireless-display-standards-explained-airplay-miracast-widi-chromecast-and-dlna/
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Chromecast offers two methods to stream content: the first employs mobile and web apps that support the Google Cast technology;
the second allows mirroring of content from the web browser Google Chrome running on a personal computer, as well as content displayed on some Android devices.
https://en.wikipedia.org/wiki/Chromecast
The primary method of playing media on the device is through Google Cast–enabled mobile and web apps, which control program selection, playback, and volume.
Google Cast receiver devices stream the media from the web within a local version of the Chrome browser,[5] thus freeing the sender device up for other tasks, such as answering a call or using another application, without disrupting playback.
Content can also be mirrored from a tab of the Chrome browser (with the Cast extension) on a personal computer or from the screen of some Android 4.4+ devices.
https://en.wikipedia.org/wiki/Google_Cast
Difference between Cast Screen and Screen Mirroring
http://www.differencebetween.info/difference-between-cast-screen-and-screen-mirroring
Multicast DNS
https://en.wikipedia.org/wiki/Multicast_DNS
Chromecast as mDNS Service in order to Cast Screen Configuration on WLC
This section describes these four configuration scenarios:
Chromecast and wireless clients on the same Wireless LAN (WLAN) and same VLAN
Chromecast on WLAN A and wireless clients on WLAN B, different VLANs
Chromecast on anchor WLC and wireless clients on foreign WLC
Chromecast and wireless clients on different VLANs (same Service Set Identifier (SSID))
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-mobility/119017-config-chromecast-mdns-wlc-00.html