R14.Consider Figure 5.26. How many sub-networks are there, in the addressing sense of Section 4.4?

Web server To external 1 Gbps internet Mail 1 Gbps server 6 5 1 Gbps 2 100 Mbps (fiber) 100 Mbps (fiber) 100 Mbps (fiber) Mixture of 10 Mbps, 100 Mbps, 1 Gbps, Cat 5 cable - Electrical Engineering Computer Science Computer Engineering Figure 5.26 An institutional network using a combination of hubs, Ethernet switches, and a router