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Question 103   What are benefits and limitations of using hidden frames

Advantages

we can access data stored on different hidden frames
more than one data field can be cached in a hidden frame

disadvantages

not all browsers support hidden frames
hidden frame data can be tampered. this can create a potential security issue.



Question 104   What are benefits and limitations of using cookies

Advantages

cookies are stored at the client side, so no server resources are required.
persistent cookies will be alive even after the user closes the browser.

disadvantages

cookies can be disabled at the browser.
cookies can be tampered. this can create a potential security issue.
large information cannot be stored on cookies since they have a size limit




Question 105   What is query string

A query string is a set of parameters passed along with the url to the web server. a query string stats with ? character and multiples values are passed using & character. a typical example of query string is given below

url?topicid=2&questid=10



Question 106   What is the maximum length of querystring

They are based on browser. maximum length supported by internet explorer is 2048. tested results are saying that firefox, opera and netscape support more than 10000 characters



Question 107   What are benefits and limitations of query string

Advantages

very simple and easy to implement
no server resources are required
supported by all browsers

disadvantages

some browsers have a limit on maximum length supported
querystings can be easily tampered



Question 108   What is absolute and sliding expiration

Absolute expiration – in absolute expiration caching, cache object will be expired after the time set to this. for example if the time set is 5 minute, in every 5 minute cache object will be expired.

sliding expiration – in sliding expiration, if an object in cache is not accessed with in the specified time cache will be expired. when accessed it’s life will be extended for the same period again.




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