Switched Network X Frame X Packet Switch X3 Host A Data Link A-R1 Host C Physical Link (A-X1) Switched Network Y Switch X4 Switch X1 Router R1 Switch X2 Route A-B Data Link R1-A2 Packet Frame Y Switched Network Z Switch Z1 Router R2 Packet Frame Z Host B Switch 22 Data Link R2-B Switch Z3 Host E Switch 24 Host D Router R3 1-4. a) What type of single network is Network X in the above Figure? b) What type of single network is Network Y? c) What protocol does Network y follow at the data link layer