The address that facilitates the routing of packets over an IP network is the network address. In the

context of IP networking, this refers to the IP address, which is used to identify each host on a

network and to determine the best path for data packets to travel from their source to their

destination. Routers use IP addresses to make decisions about where to forward packets so that they

reach the correct destination. The network layer of the OSI model, where IP operates, is responsible

for this routing process123.

The other options listed do not facilitate routing in the same way:

Physical (A) and MAC (D) addresses are used at the data link layer to deliver packets on the same

local network.

Transport (B) refers to the transport layer, which is responsible for end-to-end communication and

data flow control but does not route packets over an IP network.