Sumarizacao agregacao de_rotas
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Nos Routers (Encaminhadores), as tabelas de encaminhamento do vão crescendo com o aumento do número de redes, sendo necessário otimiza-las através da sumarização/agregação de rotas.
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Core banking is one of the last bastions for the mainframe. As many other industries have moved to the cloud, why are most of the world’s banks yet to follow?
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1. O documento introduz o conceito de VLSM (máscara de sub-rede de tamanho variável) que permite a criação de sub-redes de diferentes tamanhos dentro do mesmo espaço de endereços para uso mais eficiente dos endereços IP.
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3. Detalha os passos para calcular sub-redes usando VLSM, incluindo dividir sub-
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O documento discute routers e o protocolo NAT (Network Address Translation). Resume que routers representam nós entre redes e permitem a comunicação entre redes diferentes, e que o NAT permite que redes privadas acessem a internet usando endereços IP privados, economizando endereços públicos.
Rc02-intro-info.pdf
1. O documento introduz os conceitos básicos de redes de computadores e da Internet.
2. É explicado o que são redes, protocolos, a estrutura de borda e núcleo de uma rede.
3. São descritos os modelos de serviço orientado e não orientado a conexão, assim como os protocolos TCP e UDP.
Redes locais
Este manual fornece informações sobre como configurar e gerir redes locais nas escolas ligadas à Rede Ciência, Tecnologia e Sociedade (RCTS). Explica como construir redes locais com um ou mais computadores, controlar o acesso à Internet e disponibilizar serviços na intranet. Também descreve o funcionamento do router fornecido e como este permite a ligação das redes locais à RCTS e Internet.
1108
O documento descreve a evolução dos switches Ethernet. Inicialmente, os switches isolavam domínios de colisão e permitiam coexistência de velocidades de transmissão. Atualmente, switches suportam interfaces de alta velocidade e longo alcance usando fibra óptica, e mecanismos como VLANs e árvores de cobertura permitem particionar e redundar redes grandes.
Rota Estática / Link State / Vetor de Distância
Nesta vídeo aula eu trago os conceitos sobre funcionamento de rota estática e porque temos que entender sobre a comutação de pacote no roteador. Baseado nesse conceito explico sobre os protocolos Vetor de Distância e Link State utilizado pelos protocolos IGP.
Visite www.ciscoredes.com.br
Comdad 5
Este documento resume os principais tópicos sobre instalação e configuração de redes, incluindo desenho da rede, topologias de rede, tipos de rede, endereçamento de IP, planejamento avançado de redes, VLANs, wireless LANs, routing, VPNs e construção de cabos de rede.
Curso de redes de computadores
Este documento fornece uma introdução aos conceitos básicos de redes de computadores, incluindo os tipos de redes, componentes, topologias e cabos. Ele explica como os computadores se conectam em uma rede e compartilham recursos e informações.
Aula6.pdf
O documento descreve os principais equipamentos de interconexão de redes locais, como repetidores, hubs, bridges, switches e roteadores. Explica como cada um atua em camadas diferentes do modelo OSI e suas funções principais, como repetidores atuam na camada física apenas amplificando sinais, bridges na camada de enlace aprendendo endereços MAC, e roteadores na camada de rede usando protocolos para encaminhamento.
Aula_01.pdf
Este documento apresenta uma aula introdutória sobre redes de computadores. A aula introduz os conceitos de redes, apresenta os modelos OSI e TCP/IP e discute os principais problemas de comunicação entre computadores e as soluções encontradas, como a comutação de pacotes e a internetworking. O calendário da disciplina também é apresentado.
Apostila Digital
O documento descreve diferentes equipamentos de rede, incluindo placas de rede, repetidores, hubs, pontes (bridges), switches e suas funções. Placas de rede preparam e convertem quadros de dados, repetidores amplificam sinais, hubs replicam quadros para todas as portas, pontes isolam tráfego entre segmentos e switches dedicam velocidade a cada porta.
Apo redes
Este documento fornece uma introdução aos conceitos fundamentais de redes de computadores, incluindo: 1) estrutura de redes, arquitetura de camadas, serviços e meios de transmissão; 2) subcamada de acesso ao meio, incluindo protocolos e padrões; 3) interconexão de redes e projeto de instalação. O documento também discute protocolos e serviços da Internet e instalação de redes e serviços de rede.
Redes de Computadores " Camada de Enlace"
O documento descreve o Modelo OSI, incluindo suas sete camadas e suas funções. O Modelo OSI foi desenvolvido pela ISO para estabelecer padrões de comunicação entre sistemas abertos e encorajar a interoperabilidade entre redes de diferentes fabricantes.
Aula 6 a camada de rede
O documento descreve as funções da camada de rede no modelo TCP/IP, incluindo estabelecer rotas entre origem e destino, selecionar rotas menos congestionadas e compatibilizar problemas entre redes diferentes. A camada de rede pode utilizar circuitos virtuais ou datagramas e diferentes algoritmos de roteamento como roteamento pelo menor caminho ou por estado de enlace. O documento também discute firewalls e técnicas para prevenir e controlar congestionamentos na rede.
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Este documento discute as principais tecnologias de redes de computadores, incluindo:
1) Redes locais (LANs) baseadas em Ethernet operam na camada física e de enlace de dados do modelo OSI, usando quadros para transmissão de dados.
2) Hubs, switches e roteadores operam em diferentes camadas do modelo OSI - hubs na física, switches no enlace de dados e roteadores na rede.
3) A arquitetura TCP/IP utiliza pacotes encapsulados em quadros para comunicação entre processos através de portas
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Estrutura de apresentação:
- Apresentação do Centro de Informação Europeia Jacques Delors (CIEJD);
- Documentação;
- Informação;
- Atividade editorial;
- Atividades pedagógicas, formativas e conteúdos;
- O CIEJD Digital;
- Contactos.
Para mais informações, consulte o portal Eurocid:
- https://eurocid.mne.gov.pt/quem-somos
Autor: Centro de Informação Europeia Jacques Delors
Fonte: https://infoeuropa.mne.gov.pt/Nyron/Library/Catalog/winlibimg.aspx?doc=48197&img=9267
Versão em inglês [EN] também disponível em:
https://infoeuropa.mne.gov.pt/Nyron/Library/Catalog/winlibimg.aspx?doc=48197&img=9266
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Sumarizacao agregacao de_rotas
- 1. Protocolos de encaminhamento Conceitos - Agregação de rotas - Sumarização
- 2. VLSM - Variable-Length Subnet Mask O que é VLSM e porquê que é usado? Redes de Computadores 1
- 3. Desperdício de espaço Já se pode usar a 1ª subnet e a última!! Nos IOS Cisco estão activas por default. Desactiva “no ip subnet-zero” Redes de Computadores 1
- 4. Onde usar VLSM? Redes de Computadores 1
- 5. Cálculo de subredes VLSM Redes de Computadores 1
- 6. Exemplo VLSM Redes de Computadores 1
- 7. Agregação de Rotas A agregação de rotas é importante porque: Redes perto umas das outras poupam espaço na tabela de encaminhamento Cada rede necessita de uma entrada na tabela de encaminhamento Cada subrede necessita de uma entrada na tabela de encaminhamento A agregação pode reduzir o tamanho da tabela de encaminhamento Redes de Computadores 1
- 8. Route Summarization Sumarização de rotas • Without route summarization, Internet backbone routing would likely have collapsed sometime before 1997 !! Redes de Computadores 1
- 9. Exemplo 1 - Sumarização Redes de Computadores 1
- 10. Exemplo 2 - Sumarização Redes de Computadores 1
- 11. Configurando VLSM Redes de Computadores 1
Notas do Editor
- In the past, the first and last subnet were not supposed to be used. The use of the first subnet, which was known as subnet zero, was discouraged because of the confusion that could occur if a network and a subnet had the same address. This also applied to the use of the last subnet , which was known as the all-ones subnet. With the evolution of network technologies and IP address depletion, the use of the first and last subnets have become an acceptable practice in conjunction with VLSM. (ver fig) If the team decides to use subnet zero, there will be 8 useable subnets. Each subnet can support 30 hosts. If the team decides to use the no ip subnet-zero command, there will be 7 usable subnets with 30 hosts in each subnet. Cisco routers with Cisco IOS version 12.0 or later, use subnet zero by default.
- Without route summarization, Internet backbone routing would likely have collapsed sometime before 1997 For summarization to work, addresses should be carefully assigned in a hierarchical fashion so that summarized addresses will share the same high-order bits.
- The following are VLSM calculations for the LAN connections in Figure : Network address: 192.168.10.0 The Perth router has to support 60 hosts. That means a minimum of six bits are needed in the host portion of the address. Six bits will yield 2^6 – 2, or 62 possible host addresses. The LAN connection for the Perth router is assigned the 192.168.10.0/26 subnet. The Sydney and Singapore routers have to support 12 hosts each. That means a minimum of four bits are needed in the host portion of the address. Four bits will yield 2^4 – 2, or 14 possible host addresses. The LAN connection for the Sydney router is assigned the 192.168.10.96/28 subnet and the LAN connection for the Singapore router is assigned the 192.168.10.112/28 subnet. The KL router has to support 28 hosts. That means a minimum of five bits are needed in the host portion of the address. Five bits will yield 25 – 2, or 30 possible host addresses. The LAN connection for the KL router is assigned the 192.168.10.64/27 subnet.