On Monday, September 21, 2015 at 10:29:09 PM UTC+5:30, Barry Margolin wrote:   
   > BGP is how ISPs learn the address blocks that belong to each other. ISP1    
   > tells ISP2 "I have a route for 50.60.128.0/15". ISP2 merges that with    
   > all the routing advertisements it has received from other ISPs, and uses    
   > that when deciding where to send traffic. (This is an extreme    
   > simplification, read the Wikipedia article on BGP for more details.)   
      
      
   OK, thanks. For the moment, could you just clear up 2 things for me...? :   
   1) Suppose I'm watching a Youtube video - it's true that different bytes of   
   the same video could travel via different routes to get to me, right? Say, I'm   
   in the UK, one byte could come straight from the US, and another via South   
   America, say....? I mean,   
    that's what TCP/IP does, right?   
      
   2) What does the /15 mean, above? I've tried many times to understand what   
   subnetting is, but I've never really got it. I think you have to understand   
   internet routing before that, which, as I said, I don't *yet* (will soon! :)   
   ), right....? I realise    
   that that IS, probably, a separate question, I may open a new thread for that   
   later, for the moment, could you just help me out...? :)   
      
      
   Thanks.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)