Well, the 9800-L does support mesh, what AP you use, you must make sure its compatible with the firmware you run on the 9800.
1)Can anyone suggest me a good Outdoor AP.
Look here:
https://www.cisco.com/c/en/us/products/wireless/outdoor-wireless/index.html <>
2)Does Outdoor AP uses the same CAPWAP protocol as that of Indoor APs ?
Yes
3)Would I be able to connect it to WLC as the usual Lightweight AP?
Yes, but in mesh mode
4) Can I go for an indoor AP and use external Antennas instead of an Outdoor AP ?
Only if it has been certified for outdoor, this is typical with the part number having a ‘-P’
https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mesh-access-points.html <>
-Scott
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