Hello
Reg1) USRP N210 come with any Daughter Card (WBX or UBX) or its just USRP FPGA Backbone?
The USRP N210 (PN) is the USRP Backbone and requires installation of RF daughter card. For use case specific daughter card suggestion refer https://kb.ettus.com/Selecting_a_USRP_Device#Common_Applications
Reg2) .. how much instantanous frequency it may support to capture the signal?
Depending on the selected daughter card bandwidth up to 40MHz are possible. See https://kb.ettus.com/Selecting_a_RF_Daughterboard for a comparison of available daughtercards.
Reg3) I have used USRP X310 in LabVIEW. can i use USRP N210 (G.Ethernet connected) FPGA and stream the data to it through Ethernet interface?
Historically there were Ettus Research and NI branded USRPs. The NI branded versions are optimized for use with LabVIEW and some (like the X310) are supported in LabVIEW FPGA. In general most Ettus Research branded USRPs can also be used with LabVIEW but either require additional hardware configuration steps to enable use with the NI-USRP instrument driver or need to use the UHD driver with a custom interface into LabVIEW. Full list of NI branded USRPs and there Ettus Research counter parts: https://www.ni.com/en/shop/wireless-design-test/what-is-a-usrp-software-defined-radio/what-is-the-di...
Reg4) Similarly, B200 can also be used as X310 or not.? it only support GNU Radio?
See answer above.
