What does the term ‘NAT’ stand for in networking ?

NAT stands for Network Address Translation. This is a fundamental networking concept used to remap one IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. The primary purpose of NAT is to allow multiple devices on a local network to share a single public IP address when accessing the internet, which conserves IPv4 addresses and adds a layer of security by hiding internal network structures. Option B, Network Access Translation, is incorrect because NAT does not primarily deal with access control or authentication. Option C and D are also incorrect as they refer to 'Node' or 'Application' translation, which do not accurately describe the function of modifying IP addresses at the network layer. Therefore, Option A is the correct definition.