How physical addressing is performed in WAN? 

WAN networks operate as similar to a LAN. All WAN technology describes the specific frame format a computer uses while sending and receiving data. All computer linked to a WAN is allocated a physical address. While sending a frame to other computer, the sender should supply the destination's address. 

Several WANs use a hierarchical addressing scheme which makes forwarding more capable. Hierarchical addressing scheme divides an address in many parts. The simplest scheme divides address in two divisions; the first part recognizes packet switch and second recognizes computer attached to such packet switch.

Illustration of Hierarchical addresses in WAN

The above given figure demonstrates each address like a pair of decimal integers. A computer linked to port 6 on packet switch 2 is assigned address i.e. [2,6].