SWITCH
Autor: Os Despreocupados | Publicado: 2011-05-26T10:03:00-07:00

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 <![endif]-->  Switchs são equipamentos mais “inteligentes” que Hubs, e por isso são capazes de enviar os pacotes apenas a quem eles se destinam.

Os Switchs são comutadores, aliviando o congestionamento nas redes LAN ethernet, reduzindo o tráfego e aumentando a largura de banda.Os Switchs pode facilmente substituir os Hubs, uma vez que aproveitam a infraestrutura de rede local ethernet, conectada por Hubs.A diferença entre Hub e Switch é que os switches tomam as decisões com base nos endereços MAC e os hubs não tomam nenhuma decisão. Devido às decisões que os switches tomam, eles tornam uma LAN muito mais eficiente.Eles fazem isso “comutando” os dados apenas pela porta à qual o host de destino está conectado. Ao contrário, um hub enviará os dados por todas as portas, para que todos os hosts tenham que ver e processar (aceitar ou rejeitar) todos os dados.Vantagens para se usar Switch ao invés de Hub numa rede ethernet:Vários usuários podem se comunicar paralelamente através dos circuitos virtuais e de segmentos de rede dedicados a um ambiente livre de colisões. Ganho de performance.Como foi falado anteriormente, mudar para um ambiente com Switches é muito econômico pois aproveita toda a infraestrutura já existente no ambiente.  Com um Hub, um hacker poderia colocar um sniffer, na rede e capturar os quadros que circulam pela rede, uma vez que ele replica para todas as suas portas. Com um Switch isto não é possível. Ganho em segurança.&nbsp;