$4)$ A point$-$to$-$point $($P$2$P$)$ network requires that two communicating parties be able to proactively access each other. However, NAT devices block the access, thereby affecting normal running of P$2$P applications. STUN technology is commonly used to overcome this NAT traversal problem. It allows network devices to discover post$-$NAT IP addresses and port numbers of communicating parties and to use this information to establish P$2$P data channels traversing the NAT devices for P$2$P communication. Accordingly, analyse the traffic in the given packet and explain the relationship between SPUN and NAT by drawing a diagram $(1$ points$).$