TCP credit scheme和 sliding-window flow control scheme 有什么区别
时间: 2024-05-29 11:08:17 浏览: 16
TCP credit scheme是一种基于TCP流量控制算法的扩展,允许发送方在计算网络拥塞时保持比拥塞窗口更大的发送窗口。而sliding-window flow control scheme是一种TCP流量控制算法,允许发送方发送一定数量的数据,然后等待确认再发送更多的数据。两者的主要区别在于TCP credit scheme可以允许发送方发送更多的数据,在网络拥塞情况下可以更有效地利用带宽。
相关问题
UTF-8 和UTF-8 without DOM 有什么区别?
UTF-8 and UTF-8 without BOM (Byte Order Mark) are two different encoding schemes for representing Unicode characters.
UTF-8 is a variable-length encoding scheme for Unicode characters that uses between one and four bytes to represent each character. It is a widely used encoding scheme that is supported by most modern software and operating systems.
UTF-8 without BOM is the same as UTF-8, but without the Byte Order Mark at the beginning of the file. The Byte Order Mark is a special character that is sometimes added to the beginning of a file to indicate the byte order of the data. However, it is not necessary for UTF-8 encoded files, and some software may not handle it correctly.
In practice, the main difference between UTF-8 and UTF-8 without BOM is that UTF-8 without BOM may not be recognized correctly by some software that expects to see the Byte Order Mark at the beginning of the file.
background-image属性的data URI scheme是什么,举个例子
background-image属性的data URI scheme是一种用于将图片转换为base64编码数据的方法,可以直接将编码后的数据嵌入到CSS代码中。这种方法可以减少HTTP请求次数,加快页面加载速度。下面是一个例子:
```css
div {
width: 100px;
height: 100px;
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAA60lEQVR4nO3BMQEAAADCoPVP7WsIoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB8K1z2AABc6zJkAAAAASUVORK5CYII=);
}
```
在上面的例子中,background-image属性的值是一个data URI,其中包含了一张PNG格式的图片的base64编码数据。这张图片是一个1x1像素的黑色点,用于填充元素的背景。
需要注意的是,使用data URI scheme时,图片的大小应该尽量小,以减少CSS文件的大小。同时,如果页面中有多处使用同一张图片,最好将其封装成CSS sprite,以进一步减少HTTP请求次数。
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