1 Exercício em Tamanho de Janelas na Internet l Você está agindo como um emissor em uma conexão TCP, e você tem 217k bytes de dados para enviar. Na conexão,

Apresentação em tema: "1 Exercício em Tamanho de Janelas na Internet l Você está agindo como um emissor em uma conexão TCP, e você tem 217k bytes de dados para enviar. Na conexão,"— Transcrição da apresentação:

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2 1 Exercício em Tamanho de Janelas na Internet l Você está agindo como um emissor em uma conexão TCP, e você tem 217k bytes de dados para enviar. Na conexão, você concorda que o TCP utiliza o algoritmo de inicialização lenta (slow start) com um terceiro parâmetro, o limitante (threshold): –Tamanho do segmento inicial: 2K. –Parâmetro limitante inicial: 16K. l Destino tem 24K de buffer (janela do receptor). –Usuário destino somente pega os dados quando o buffer receptor estiver cheio. –Para um buffer parcialmente cheio, a janela de controle de fluxo é reduzida para o espaço atual restante no buffer. l O tempo expira na 14a mensagem, mas esta é reenviada com sucesso antes de enviar a 15a mensagem.

3 2 Você pode preencher essa tabela?

4 3 2K 4K Mensagem 1 2K Quantidade deixada para enviar: 217K Janela de Controle de Congestionamento : Janela Limitante de Congestionamento: 16K Janela de Controle de Fluxo: 24K 2K 215K 22K

5 4 22K 18K 4K 8K 215K 211K Mensagem 2 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 4K 2K

6 5 211K 203K 18K 10K 8K 16K Message 3 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 8K 2K

7 6 16K 10K 0K 203K 193K Message 4 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 10K 2K

8 7 0K 24K 193K 16K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

9 8 24K 8K 16K 18K 193K 177K Message 5 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 16K 2K

10 9 8K 0K 18K 177K 169K Message 6 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 8K 2K

11 10 0K 24K 169K 18K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

12 11 169K 151K 18K 20K 24K 6K Message 7 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 18K 2K

13 12 151K 145K 20K 6K 0K Message 8 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 6K 2K

14 13 0K 24K 145K 20K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

15 14 145K 125K 24K 20K 22K 4K Message 9 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 20K 2K

16 15 125K 121K 4K 0K 22K Message 10 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 4K 2K

17 16 0K 24K 121K 22K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

18 17 121K 99K 22K 24K 24K 2K Message 11 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 22K 2K

19 18 99K 97K 2K 0K 24K Message 12 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

20 19 0K 24K 97K 24K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

21 20 97K 73K 24K 26K 0K Message 13 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 24K 2K

22 21 0K 24K 73K 26K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 2K

23 22 26K 73K 24K Message 14 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 24K

24 23 73K 49K 24K 0K 26K 2K Re-send message 14 Amount left to send: Congestion control window: Congestion threshold: 16K Flow control window: 24K 2K 13K

25 24 0K 24K 49K 2K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 2K

26 25 49K 47K 2K 4K Message 15 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 24K 2K 22K

27 26 47K 43K 22K 18K 4K 8K Message 16 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 4K 2K

28 27 43K 35K 18K 10K 8K 13K Message 17 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 8K 2K

29 28 35K 25K 13K 10K 0K Message 18 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 10K 2K

30 29 0K 24K 25K 13K Receiver picks up data 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 2K

31 30 24K 11K 25K 12K 13K 15K Message 19 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 13K 1K 2K

32 31 12K 1K 15K 11K 0K Message 20 2K Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 11K 1K 2K 1K 2K

33 32 2K 1K 0K 24K 1K 15K Receiver picks up data Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window:

34 33 1K 0K 15K 24K 23K Message 21 Amount left to send: Congestion control window: Congestion threshold: 13K Flow control window: 1K

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