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Now more than ever, today’s businesses require reliable network connectivity and access to corporate resources. Connections to and from business units, vendors and SOHOs are all equally important to keep the continuity when needed. Business runs all day, every day and even in off hours. Most companies run operations around the clock, seven days a week so it’s important to realize that to keep a solid business continuity strategy, redundancy technologies should be considered and/or implemented.
So, we need to keep things up and available all the time. This is sometimes referred to five nines (99.999) uptime. The small percentage of downtime is accounted for unforeseen incidents, or ‘scheduled maintenance’ and usually set to take place during times of least impact, like in the middle of the night, or on holiday weekends if planned. If this is not a part of your systems and network architecture it should be considered if you want to keep a high level of availability. Because things break and unforeseen events do take place, we need to evaluate the need for creating an architecture that is ‘highly available’, or up as much as possible, with failures foreseen ahead of time and the only downtime, is to do planned maintenance.

Quizz et notions générales portant sur les réseaux et protocoles TCP UDP, kerberos protocole voieIP Ethernet, Wifi, support de transmissions, Cryptographie , cheval de Troie, ver et virus, attaques web , intrusions, pare-feu
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Quando calculamos sub-redes, há várias formas “criativas” de se complicar a vida em uma questão. Porém, avaliando de forma bem pragmática, podemos constatar que há na verdade alguns poucos tipos de questões com os quais devemos lidar. Nesse artigo, vamos resumir os principais tipos de questões que iremos tratar e qual a melhor estratégia de ataque de cada um dos tipos de questões.

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In this paper, an integrated network design for university has been presented. This network design is composed of many sections. First, the paper started to explain the design constraints. Many universities are eager to design a network that meets standards but has always been faced with cost implementation barrier. Secondly, this design accounts for challenges that will be faced when designing network due to the lack of a rich economy like developed countries. Another challenge that we have limited equipment availability, requiring careful selection of components. Also, security is an important section in this network design. Strong security solutions are detailed including as firewall, backup, virtual switch and DNS server options. This configuration includes some software applications, such as antivirus, password, and encrypted passwords. This design allows for future expansion, as universities using this design can connect 3115 additional hosts, allowing for per host costs, like cabling. The additional hosts can be included without exhausting the available IP address. Also, if there are high budget, they can develop the network system to become more powerful, have a high level of security and many servers can be added to the network. Lastly, as cheap and effective as the methods of designing a network in this research are, it is not limited to only developing countries.

Sumarizar rotas (ou não) sempre foi um daqueles pontos controversos quando falamos de tecnologias de redes. Muitas vezes mal compreendida, esta tecnologia pode ser uma aliada ou grande inimiga dos ambientes, dependendo da forma como for implementada.