1. http://blog.ccna.com.br/2010/02/17/exclusivo-packet-tracer-v53/
http://www.youtube.com/watch?v=IpUKGgp2T0c&feature=related
http://www.youtube.com/watch?
feature=iv&src_vid=IpUKGgp2T0c&annotation_id=annotation_881323&v=pv8SWKDtHso
http://www.youtube.com/watch?
feature=iv&src_vid=IpUKGgp2T0c&annotation_id=annotation_906258&v=EG9mSXlMTU4
http://www.videoaulasbrasil.com.br/redes/simulador-de-rede-packet-tracer-cisco-
ccna-%E2%80%93-parte-3/
http://estudeccna.com.br/download/packet-tracer-em-portugues
http://netfindersbrasil.blogspot.pt/2009/05/simuladores-de-redes-para-todos-
os.html
Abertura de portas
http://www.youtube.com/watch?v=PgcBgPkKicw