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1.What data encoding technology is used in copper cables?

electrical pulses

2. A cable installation company is trying to convince a customer to use fiber-optic cabling instead of copper cables for a particular job. What is one advantage of using fiber-optic cabling compared to copper cabling?

Fiber-optic cabling is completely immune to EMI and RFI.

3.What will a Cisco LAN switch do if it receives an incoming frame, and the destination MAC address is not listed in the MAC address table?

Forward the frame out all ports except the port where the frame is received.

19 . INTERNET

24.

A single packet can be sent to a group of hosts.

Multicast transmission can be used by routers to exchange routing information.