Hello Swapnil
RIP is an Interior Gateway Routing Protocol (IGRP) which means that it functions within an organization’s or an enterprise network. RIP and other IGRPs (such as OSPF or EIGRP) are not regularly used by ISPs and their internal networks as they usually use BGP.
So R1 will not share its routing information with the ISP router nor with the ISP router share its information with R1. (If sharing of routes between ISP and R1 routers was enabled, it would most likely use BGP).
However, in order for R1 to route correctly to 4.4.4.4 (and to any other destination on the Internet), it will used a default route as configured in the lesson:
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.14.4
The ISP1 router in turn will also have to have a route to the internal networks of the enterprise. Something like:
ip route 192.16812.0 255.255.254.0 192.168.14.1
Since there is no routing protocol (such as BGP) configured between the R1 and ISP1 routers, these must be configured statically.
I hope this has been helpful!
Laz