In Figure $1-28,$ when Host A transmits a packet to Host B$,$ how many physical links, data links, and routes will there be along the way? How many packets and frames? How many switches and routers? Route A$-$B$3$ Networks $($X$,$Y$,$Z$)1$ Packet & Route$$Switched Network Z Host B$$Switch Z$1$Packet Switch Z$2$Data Link R$2-$B$$Frame Z Switch Z$3$ Router R$3$ Host D Switch Z$4$ Host E FIGURE $1-28$ An Exercise in Physical, Links, Data Links, and Routes Router R$23$ Frames & Data Links $7$ Physical Links