Projeto Simulador José Rafael; Pedro Barbosa; Solon Aguiar

1

O modelo

Inalterado ao longo da etapa 3; Modelo utilizado desde a etapa 2 mostrou-se preciso e confiável para os objetivos propostos.

2

A rede

3

O modelo

LCC2

bart switch internet

worker

worker

4

O simulador

5

Sobre o modelo... Não há clientes; Há apenas interface;

classes um

diferentes

servidor

para

de cada

Tempo de processamento depende apenas do tamanho do pacote e da largura de banda.

6

A avaliação

Apresentada distintos;

em

três

cenários

Alteração das taxas (jitter); tamanho dos pacotes e largura de banda.

7

Avaliação Para o simulador, duas medidas foram consideradas pertinentes: Tempo médio dos pacotes em cada fila; Tempo médio de ociosidade em cada inteface.

8

Medidas

As medidas permitem avaliar bem o desempenho do simulador implementado. Teoria da rede de filas não se aplica ao modelo proposto.

9

Cenário Um Largura de banda: 100 Mbps; Tamanho dos pacotes na internet: 2000 B; Tamanho dos pacotes na rede local: 1500 B; Taxa de chegadas dos pacotes na internet: 44 pps; Taxa de chegada dos pacotes na rede local: 47 pps. 10

Os valores esperados Tempo médio em fila interface da rede local: 0 seg. Tempo médio em internet: 0 seg.

fila

interface

da

Tempo médio ocioso da interface da rede local: 0.9943 (99.43% do tempo). Tempo médio ocioso da interface da internet: 0.9929 (99.29% do tempo). 11

No simulador... Tempo médio em fila interface da rede local: 0 seg. Tempo médio em internet: 0 seg.

fila

interface

da

Tempo médio ocioso da interface da rede local: (0.99414; 0.99432) 0.9943. Tempo médio ocioso da interface internet: (0.99260; 0.99291) 0.9929. 12

da

Graficamente...

13

Cenário Dois Largura de banda: 0.5 Mbps; Tamanho dos pacotes na internet: 2000 B; Tamanho dos pacotes na rede local: 1500 B; Taxa de chegadas dos pacotes na internet: 44 pps; Taxa de chegada dos pacotes na rede local: 47 pps. 14

Os valores esperados Tempo médio em fila interface da rede local: 0.1348 seg. Tempo médio em fila internet: 0.459 seg.

interface

da

Tempo médio ocioso da interface da rede local: 0.0 (0% do tempo). Tempo médio ocioso da interface da internet: 0.0 (0% do tempo). 15

No simulador... Tempo médio em fila interface da rede local: (0.122; 0.184) 0.1348 seg. Tempo médio em fila interface da internet: (0.443; 0.524) 0.459 seg. Tempo médio ocioso da interface da rede local: 0.0 (0% do tempo). Tempo médio ocioso da interface da internet: 0.0 (0% do tempo). 16

Graficamente...

17

Cenário Três Largura de banda: 1.5 Mbps; Tamanho dos pacotes na internet: 20000 B; Tamanho dos pacotes na rede local: 1500 B; Taxa de chegadas dos pacotes na internet: 55 pps; Taxa de chegada dos pacotes na rede local: 67 pps. 18

Os valores esperados Tempo médio em fila interface da rede local: 0 seg. Tempo médio em fila internet: 4.38 seg.

interface

da

Tempo médio ocioso da interface da rede local: 0.4640 (46.40% do tempo). Tempo médio ocioso da interface da internet: 0.0 (0% do tempo). 19

No simulador... Tempo médio em fila interface da rede local: 0 seg. Tempo médio em fila interface internet: (4.329; 4.404) 4.38 seg.

da

Tempo médio ocioso da interface da rede local: (0.4556; 0.4657) 0.4640. Tempo médio ocioso da interface da internet: 0.0 (0% do tempo). 20

Graficamente... Tempo em fila na interface internet.

Tempo em ocioso na interface da rede local.

21

Conclusão Simplificações e modelo facilitaram os cálculos;

bem

definido

Resultados não apresentaram maiores problemas para caírem nos intervalos.

22

Router Simulator.pdf

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