假设客户端采用持久型HTTP?1.1版本向服务器请求一个包含10个图片的网页。设基本页面传输时间为Tbas，图片传输的平均时间为Timg，客户端到服务器之间的往返时间为RTT，则从客户端请求开始到完整取回该网页所需时间为()。
- A.1×RTT+1×Tbas+10×Timg
- B.1×RTT+10×Tbas+10×Timg
- C.5×RTT+1×Tbas+10×Timg
- D.11×RTT+1×Tbas+10×Timg
正确答案及解析
正确答案
解析
HTTP?1.1支持持久连接，即一个TCP连接上可以传送多个HTTP请求和响应，减少建立和关闭连接的消耗和延迟。本题，传输网页过程如图3所示。
图3传输所有网页时间=页面传输时间+建立连接总时间+10×（图片传输时间+往返时间）=1×Tbas+10×Timg+11×RTT
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