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Hubs e Switches

Protocolos de roteamento de rede

QuestionAnswer
Hubs São dispositivos de camada física, ou seja, não entende cabeçalhos da camada de enlace, rede e transporte
Modo de operação - Cada bit detectado em uma porta repete em todas as outras - Não há filas, pois quadros não são armazenados - Bits saem por todas as portas na mesma taxa de transferência.
Consequências do HUB - Dois ou mais transmitem simultaneamente, haverá colisão.
Switchs Dispositivo de camada de enlace. Possui papel ativo.
Switches - Detalhes - Armazenam e reenviam quadros, - Examina o MAC do destinatario e retransmitem seletivamente pela porta específica. - Usa CSMA/CD para retransmitir - Realiza Filtragem de quadros
Consequências dos Switches - Isola domínios de colisão - Permite Transmissão Simultâneo de mais remetente - Possui fila de quadros na memória
HUB Camada = Física Método comutação = cut-through Plug and play Transparente
Switches Camada = Enlace Comutação = Store and Forward Plug and Play Transparente
Roteador Camada = Rede Comutação = Store and Forward Filtro Não é plug and play Não é transparente
SWITCH Aprendizado, Filtragem e Retransmissão seletiva Após receber o Quadro, 1 Le o MAC do remetente 2 Registra e atualiza a tabela de filtragem 3 Procura pelo endereço MAC do destinatário na tabela de filtragem 3A - Caso não encontre, flood / 3B Retransmite seletivamente 3c Mesma porta= descarta.
Created by: Israelleite
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