picture for network design

https://www.google.ae/search?hl=ar&gbv=2&biw=1366&bih=566&tbm=isch&sa=1&q=network+design&oq=network&aq=8&aqi=g10&aql=&gs_l=img.1.8.0l10.93836.100029.0.104569.7.4.0.3.3.0.281.656.0j3j1.4.0...0.0._Q30SFUqyps