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Protocolo de Gateway de Fronteira

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The Border Gateway Protocol (BGP) is a fundamental protocol designed to direct internet[2] traffic across the globe. First sketched out informally in 1989, it was officially described in the same year in RFC 1105, and has been actively used on the Internet since 1994. BGP works as a path vector protocol and operates based on Protocolo de Controlo de Transmissão[1] (TCP), using port 179 for communication. It establishes sessions between peers to exchange routing information, selecting the best routes through a decision process. BGP is essential for supporting policy-based routing, traffic engineering, and preventing routing loops. However, it does face challenges such as security[3] vulnerabilities, scalability issues, route flapping, and a lack of built-in encryption, which can lead to resource consumption in large networks. Despite these, it remains a crucial component of the Internet’s infrastructure.

Definições de termos
1. Protocolo de Controlo de Transmissão ( Transmission Control Protocol ) The Transmission Control Protocol (TCP) is a key technology that makes the internet work. It was introduced by Vint Cerf and Bob Kahn in 1974 and detailed in the Request for Comments (RFC) 675. TCP is a set of rules for managing the delivery of data over the internet or other networks. It ensures data travels safely, quickly, and in the right order from one computer to another. TCP is responsible for creating a connection between computers, maintaining it, and ending it when it's no longer needed. It also takes care of re-sending any data that gets lost along the way. TCP is used by many internet applications like email, web browsing, and streaming media. It's also important for managing network performance and security. TCP's segment structure, which includes a header and data section, contains important information for data delivery. Despite its many strengths, TCP also has vulnerabilities that need to be managed, like the potential for denial of service attacks.
2. internet. A Internet é um sistema global de redes informáticas interligadas que utilizam protocolos de comunicação normalizados, principalmente o TCP/IP, para ligar dispositivos em todo o mundo. Com origem no termo "internetted" utilizado em 1849, o termo "Internet" foi mais tarde utilizado pelo Departamento de Guerra dos EUA em 1945. O seu desenvolvimento começou com cientistas informáticos que criaram sistemas de partilha de tempo na década de 1960 e progrediu com a criação da ARPANET em 1969. A Internet é autónoma, sem uma autoridade central, e os seus principais espaços de nomes são administrados pela Internet Corporation for Assigned Names and Numbers (ICANN). Transformou significativamente os meios de comunicação tradicionais e tem crescido exponencialmente ao longo dos anos, com os utilizadores da Internet a aumentarem anualmente de 20% para 50%. Em 2019, mais de metade da população mundial utilizou a Internet. O conjunto de protocolos da Internet, que inclui o TCP/IP e quatro camadas conceptuais, orienta os pacotes da Internet para os seus destinos. Serviços essenciais como o correio eletrónico e a telefonia via Internet funcionam na Internet. A World Wide Web, uma coleção global de documentos interligados, é uma componente essencial da Internet.

Protocolo de Gateway de Fronteira (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. BGP is classified as a path-vector routing protocol, and it makes routing decisions based on paths, network policies, or rule-sets configured by a network administrator.

Protocolo de Gateway de Fronteira
Protocolo de comunicação
BGP state machine
AbbreviationBGP
Purposeexchange Protocolo Internet routing information
IntroductionJune 1, 1989; 34 years ago (1989-06-01)
Based onEGP
OSI layerApplication layer
Port(s)tcp/179
RFC(s)§ Standards documents

BGP used for routing within an autonomous system is called Interior Border Gateway Protocol (IBGP). In contrast, the Internet application of the protocol is called Exterior Border Gateway Protocol (EBGP).

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