Some commercial network services offer satellite network connections to individuals. Each subscriber is given a small dish antenna that is used to receive data; the subscriber is also given a dialup telephone modem that is used to send data. Find out the reason why a subscriber cannot send data to the satellite. (4 Marks) b) An IP address does not identify a specific computer. Instead, each IP address identifies a connection between a computer and a network. Instead of assigning one address per network connection, some protocols assign each computer a single address. Explain the main advantage and disadvantage of having a single address for a router.