My friend and I Live on different floors in same society, We have connected our computers using a cross cable so that we can share fiLes without using pen drives, But now our cabLe is not working, I want to know how can we check whether the cross cabLe is fine or not?

Also, I have an MTNL broadband internet connec¬tion with 200 MB download free, I want to know if there is any command or method by which I can come to know how much I have down¬loaded so that I do not exeed my limit