First try with manual url code if your json is working then put that url as dynamic
And why you have mentioned two time url there I could not understand.
var url = "ControllName/GetNetworkData";
$.ajax({
url: url,
cache: false,
type: 'GET',
contentType: 'application/json; charset=utf-8',
data: {},
success: function (data) {
alert('success');
}
});