The threats to the security of the networks no longer restrict only to the computers of end users, portable and servants. The attacks against the basic components of the network infrastructure, that includes routers and switches, now are a crude reality. This was of manifesto does very little in the conference Black Hat 2005 made in Fertile valleys, NV, in where an ex- investigator of security described new techniques of exploit which they would be possible to be used to obtain remote control of critical infrastructure devices of mark Cisco. This only comes to accentuate the problems and risks associated with the implementation and the maintenance of any technology of network in threatened surroundings where all the equipment of the infrastructure is vulnerable to an attack. In the infrastructure equipment a series of unique problems of security exists, between which they are included: