My Raspberry Pi 3 shows no network access I tried with putty but its showing connection timed out
Probably haven't enabled SSH on the Pi.
In a terminal on the Pi do a sudo raspi-config and under the "7 - Advanced" menu option check that SSH is actually enabled.
If it is, from that terminal window do a sudo ifconfig and confirm that the IP number is the one that you are actually trying to connect to.
Try going to your modem's page(192.168.1.1) and check the DHCP clients so that you could see the raspberry pi's IP Address. Or try connecting with the hostname raspberrypi