Regarding DNS Redirection

how Can i Implement a DNS Redirection in Arduino using C++?

That field is very broad. Give a concrete example of what you are trying to do with your Arduino.
For example, the goal may be to contact an arduino hosted on an internal network from the internet.

i am Working on a LINKIT7697 Wifi Module ,initially it will be in Access Point mode and then,when a Device connects to it and tries to Visit a Page it should be Redirected to the Default Page..i am trying this..

how can do this in arduino

That sounds like "captive portal" mode. There are examples around using the ESP8266. I have never heard of your WiFi module and had to look it up: https://blog.hackster.io/first-look-at-the-linkit-7697-218f3b5ac55c