(1) What are the carrier signals used in the network media of copper, optical fiber and wireless? cal fiber (2) Refer to the diagram below. Answer the following questions. Router1 Router2 Router3 Switch4 Hub5 Switch7 PC1 PC2 PC3 PC4 How many broadcast domains are there in the above network? - - Please select all the broadcast domains in the above diagram. (By drawing a big circlefor each broadcast domaift) If PCI sends out a broadcast packet, which devices, including PCs, hubs, switches and routers, will receive this broadcast packet? . How many IP subnets are needed for the above network? How many IP addresses are needed to be configured on the interfaces of the devices? Please mark all the IP addresses in the above diagram. (By drawing a small solid circle on each interface of the devices.)