How do Session layer devices contribute to maintaining communication sessions between network hosts?

MAC addresses may be reused on many network interfaces. When given the opportunity, why are you rejecting it? Is there a higher chance of IP address conflicts when utilizing several network interfaces? Does this behavior have any legitimacy at all?

Some applications may make use of resources provided by two different transport layers (UDP or TCP). Consequently, how can a computer determine which transport layer is responsible for delivering a packet?

A host or router's IP address and its subnet mask make up the two halves of the addressing scheme. Who are they, exactly?

Describe the concept of NAT (Network Address Translation) and its role in conserving IP addresses in device network connections.