how does the router identify which computer in a network has requested the webpage as it stores jst network id

Question

As the router stores only the network id of a network, what is procedure that the requested page reaches the correct MAC address or ip address?

Answer 1

Basically all of this is stored in the routers "lookup table" which compares MAC and IP and simply routes traffic back to the original source.based upon that table. (That's about a simple as it can be explained in the space here.) On occasion these tables get confused and force a reboot or other method to "clear" that table.

For a full explanation try this article
http://computer.howstuffworks.com/router.htm

Merry Christmas and God Bless