任务1：通过配置识别边缘服务器。
通过配置系统，让它能够识别边缘服务器。
Akamai边缘服务器向我们的数据中心发送请求。
The Akamai edge server sends the request to our data center.
下面的场景可能会用无效的数据“毒害”边缘服务器缓存。
Following is a scenario that can potentially "poison" the edge server cache with invalid data.
如果在边缘服务器上有此内容，就从缓存取出内容并返回给用户。
If the content is available from the edge servers, it is returned to the user from the cache.
当用户请求一个对象时，请求先被转到Akamai边缘服务器。
When a user makes a request for an object, the request is first directed to the Akamai edge servers.
如果响应码是 200，边缘服务器会自动地缓存所有可缓存的内容。
The edge server will automatically cache any cacheable content if the response code is 200.
下载的文件首先复制到S3 存储桶中，然后复制到边缘服务器中。
The files to download are first copied to a S3 bucket, and are later replicated to the edge servers.
第一个任务是配置您的系统，让它能够识别Akamai边缘服务器。
The first task is to get your system configured so that it recognizes the Akamai edge servers.
协议服务提供传输级服务，包括身份验证、文档路由和用于自动化文档互换的边缘服务功能。
Protocol services provide transport level services, including authentication, document routing, and edge service functions for automated document interchange.
应用程序不发送正确的状态码看似没什么害处，但是在启用边缘服务器时这会成为真正的问题。
Failing to send the proper status code from your applications may seem harmless, but it can turn out to be a real problem when trying to enable to the edge server.
当边缘服务器接收从到源服务器的内容，它将基于响应内容中的HTTP头建立内容的缓存。
When the edge server receives the response from the origin server, it stores the content in cache based on the HTTP headers of the response.
因为边缘服务器缓存的资源要在下一次请求时返回，一定要确保缓存的数据表示资源的正确内容。
Since a resource cached by the edge server is returned in the next request, it is very important to make sure the cached data represents the correct content of that resource.
有时候，有必要提前刷新akamai边缘服务器缓存的内容，而不是等到边缘服务器配置中指定的过期时间。
Sometimes it is necessary to refresh the content cached in Akamai edge servers without waiting for expiration that is specified in the edge server configuration.
通过案例研究讲解集中部署方案，重点介绍ATM、以太网和帧中继边缘服务如何能够部署在分组交换网络中。
Taking a case study approach to several deployment scenarios, the primary focus is on how ATM, Ethernet, and Frame Relay edge services can be deployed over packet-switched networks.
通过把这些对象缓存在更接近最终用户的边缘服务器上，Akamai可以减少从起源服务器获取静态内容所需的往返次数。
By caching these objects on the edge server closer to the end users, Akamai can reduce the number of round trips to retrieve static content from the origin server.
tcp_hit值表明Akamai边缘服务器从缓存中返回此文件，并不需要通过访问我们的数据中心获取相同的文件。
The value TCP_HIT indicated that the Akamai edge server is returning the file from the cache and did not need to go back to our data center to fetch the same file.
这假设这些文本、图像、电子表格、音频文件都可以缓存，因为它们是静态的；把它们放在边缘服务器缓存中可以提高性能。
The assumption is that these text, image, stylesheets, audio files can be cached because they are static; that performance is increased by having them in the edge server caches.
如果边缘服务器对于每一个请求都需要请求源服务器，那么它有没有价值的(事实上，成本比只是发送请求到源服务器本身还高)。
If an edge server needs to make a request to the origin server for every request, then it has no value (and in fact, costs more than just making the request to the origin server itself).
在逻辑上，流程代理程序是一个单独的实体，但在物理上，它是作为边缘服务器(edge server)的一个协作网络执行的。
Logically, the Process Brokers are a single entity, but are physically rendered as a collaborative network of edge servers.
避免Internet通信流拥挤：由于Internet通信流不稳定，起源服务器与Akamai边缘服务器之间的直接路由可能很拥挤。
Avoiding Internet traffic congestion: the direct route between the origin server and the Akamai edger servers may be congested because of Internet traffic.
今天的铁路货运服务正面临边缘化，其市场份额只有8%。
Today rail freight services are facing marginalisation, with just 8% of market share.
很多情况下，这些用例是公开在企业边缘的业务服务，或者在贯穿业务线企业边界内所用的非常好的候选。
These use cases often are very good candidates for business services exposed at the edge of the enterprise, or for those used within the boundaries of the enterprise across lines of business.
这些团体的工作将患者置于直接督导下的短程化疗战略的中心，并在偏远地区以及在处于不利境况和边缘地位的人群中改善获得结核服务。
The work of these groups puts patients at the centre of the DOTS strategy, and improves access to TB services in remote areas and among disadvantaged and marginalized populations.
在企业中，社交媒体一般游走在客户服务、IT、公关、营销和销售部门的边缘。
The field also dances along the edges of customer service, IT, public relations, marketing and sales, according to the Social Media Influence report.
然而，自布莱克方程发表36年以来，衍生品的增长将其从金融服务的边缘带进了后者的核心领域。
However, the growth of derivatives in the 36 years since Black's formula was published has taken them from the periphery of financial services to the core.
在中间件层边缘(我们将边缘视为层次间转换发生的地点)，很可能会存在其他组件，如代理服务器等。
At the edge of the middleware tier (an edge is considered as a point where transition from one tier to another takes place), there are most likely found other components, such as proxy servers.
类似的网页边缘缓存中，收到很多对相同信息请求的服务可以使用XQuery引擎临时缓存XML数据。
In an analogous situation to Web page edge caching, services that receive many requests for the same information can use an XQuery engine to temporarily cache the XML data.
服务请求通过传输器注入到NetKernel中，这些传输器是位于系统边缘的事件侦测器。
Service requests are injected into NetKernel by transports, which are event detectors residing at the edge of a system.
因为已经开启了镜像写一致性检查(MWC)，所以如果卷位于边缘，那么应该能够更好地为其提供服务。
Because Mirror Write Consistency (MWC) is on, the volume would have been better served if it were placed on the edge.
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