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Link protection: is designed to safeguard networks from failure. Failures in high-speed networks have always been a concern of utmost importance. A single fiber cut can lead to heavy losses of traffic and protection-switching techniques have been used as the key source to ensure survivability in such networks.
URL shortening: is a technique on the World Wide Web in which a Uniform Resource Locator (URL) may be made substantially shorter and still direct to the required page.
This is achieved by using a redirect, often on a domain name that is even shorter than the original one, which links to the web page that has a long URL.
For example, the URL "http://example.com/assets/category_B/subcategory_C/Foo/" can be shortened to "https://example.com/Foo", and the URL "http://example.com/about/index.html" can be shortened to "https://inv2.win/1". This is convenient for any of the reasons why a friendly URL may be desired, such as for messaging technologies that limit the number of characters in a message (for example, SMS), for reducing the amount of typing required if the reader is copying a URL from a print source, for making it easier for a person to remember, or for the intention of a permalink. In November 2009, the shortened links of the URL shortening service Bitly were accessed 2.1 billion times.
There are several reasons to use URL shortening. Often regular unshortened links may be aesthetically unpleasing.
Many web developers pass descriptive attributes in the URL to represent data hierarchies, command structures, transaction paths or session information.
This can result in URLs that are hundreds of characters long and that contain complex character patterns.
Such URLs are difficult to memorize, type-out or distribute. As a result, long URLs must be copied-and-pasted for reliability.
Thus, short URLs may be more convenient for websites or hard copy publications (e.g. a printed magazine or a book), the latter often requiring that very long strings be broken into multiple lines (as is the case with some e-mail software or internet forums) or truncated.