(25 pts) 2. Suppose there are ten users sharing a 2Mbps link, and user 1 suddenly generate one thousand 2000-bit packets, while other users remain quiescent and do not generate packet. (8 pts) (2.1) Assume under Time division multiplexing (TDM) circuit switching with 10 slots per frame and user 1 is allocated one time slot. How long does it take to transmit the one thousand 2000-bit packets (2 million bits) data for user 1? (8pts) (2.2) How about using packet switching, how long it will take to transmit the one thousand 2000-bit packets (2 million bits) data for user 1? (9pts) (2.3) Briefly explain the difference between circuit-switching and packet- switching. Please explain what scheme is Internet based