The present article tries to visualize the most excellent schemes and complex than they appear in the management of networks TCP/IP, their sizing in the transport protocol TCP and the incidences that the troyanos intrusion problems of and virus entail to. To know the soft spots and as to solve they represent them decisions that often must take to fortify the perimeters of computer science security. At the moment the great companies of this country, must like priority establish models of social engineering and management of security applied to control of ports and services of network, like solution to the detection and control of internal and external intruders in an alert network. Nevertheless the security patrons who entail to structure values of control in the channels of bandwidth for the emergent networks are giving a vertiginous turn that specifically involves diverse tests of penetration with protocol TCP, to have a clear vision of the reaches and protection in which a network is considered vulnerable.