I heard that we can create a tunnel to access network resources using the unix putty client. Is it possible? If so, how can we create a tunnel using putty tool?
Putty is just an ssh client. While ssh has some ways of tunneling, these tend to be on the crude side for quick and dirty tunnels, or individual port access, not full clean tunnels.
Any tunnel over a TCP protocol (such as those supported by ssh) are going to be troublesome, just research tunnel over tcp and you'll see why.
6in4 tunnels tend to be more reliable, similar to straight GRE if you're familiar with that.