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With cloud storage, be sure to protect it cryptographically as well This includes encrypting the data you store and ensuring that data is set up to be destroyed when the storage key is destroyed This process will make your data more secure, but it also requires a lot of keys Consider the network diagram in Figure 5-1 Obviously this doesn t show every element of your network, but you ll notice a key management server, which is critical to have to keep track of all your keys Keys on the server include Transport keys Authentication keys Authorization tokens File encryption keys Hardware storage keys Revocation keys Certificates
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We ve talked about accessing the cloud via the Internet, and that is the case, in a general sort of way In order for the cloud to deliver its best resources, there are differing levels of connectivity needed
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Research firm Gartner identified four different levels in a June 2008 study In the study, Gartner notes that different organizations require different things from the cloud, and as such they will have to connect in different ways What works for one organization might not necessarily be the best means of connectivity for another
NOTE Gartner also notes that one organization doesn t need to lock into one solution They might
have one, two, three, or all four connectivity types, based on their need
Basic Public Internet
The first option is the pipe most of us have coming into our office or homes The public Internet is the most basic choice for cloud connectivity This is the type of access that you buy from an Internet service provider (ISP) and connect with via broadband or dial-up, based on your location
PART II
NOTE Cloud computing over a dial-up connection is difficult to do, but depending on the location
of your site or a remote site, it may be all you have We ll talk about it later in this chapter But basic public Internet is just that basic There are no extras like Transmission Control Protocol (TCP) acceleration, advanced compression, or application-specific optimization This model has the following advantages: There s a large audience Anyone with Internet access can use this solution It s highly fault tolerant Many provider options are available Secure Sockets Layer (SSL) based, Hypertext Transport Protocol Over Secure Sockets Layer (HTTPS), encrypted access provides confidentiality It s cost-effective It also has the following disadvantages: Lack of end-to-end quality of service (QoS), thus making end-to-end service-level agreements (SLAs) difficult to reach Probability of poor response over high-latency connections This is worsened by protocol inefficiencies in TCP, HTTP, and web services Downtime that might be out of your control (cable cuts, problems at the ISP, and so forth) Utilizing this method, organizations should consider subscribing with multiple ISPs, and cloud providers should also get bandwidth from multiple sources Ideally, the client would get bandwidth from one of the same ISPs as the vendor This aids in speed, reliability, and a better chance of success with an SLA
Part II:
Cloud Computing Technolog y
The Accelerated Internet
Employing advanced application delivery features on top of your Internet connection can benefit both the service provider and the client Cloud improvement can increase by 20 percent to 50 percent by offloading network-related functions from the server SSL termination and TCP connection management remove a significant amount of processing from the front-line servers Additionally, dynamic caching, compression, and prefetching results in better than a 50 percent performance increase for end users Some providers offering this service include AT&T Hosting Citrix NetScaler F5 s WebAccelerator This method is mostly oriented toward the cloud service provider, but in the end it benefits the end user Organizations opting for this method of connectivity should look at SLAs and monthly bandwidth charges, rather than worry about what acceleration methods the service provider is adding At the cloud, this method of acceleration requires the installation of a server-side appliance At the end user, it normally requires the installation of a downloadable client
NOTE While this is an acceleration of the basic public Internet option, it does not address any of its
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