1. Refer to Figure 1-28 (page 35 of the textbook):
   1. What type of single network is Network Y?
   2. What type of single Network is Network X?
   3. What type of protocol does Network Y follow at the data link layer?

Switched Network X FrameX et Switch X3 Data Link A-R1 Host A Host C Physical ink (A-X1) Switch X4 Switch X1 Network Y Router R1 Switch X2 Route A-B Data Link Route A-B 3 Networks (X,YZ) 1 Packet & Route 3 Frames& Data Links 7 Physical Links R1-R2 Packet Frame Y Switched Network Z Host B Switch Z1 Router R2 Frame Z itch Data Link R2-B Switch Z3 Router R3 Switch Z4 Host D Host E FIGURE 1-28 An Exercise in Physical, Links, Data Links, and Routes