Figure 7-3: Full Mesh and Pure Hub-and-Spoke Topologies for Leased Line Data Networks Site A Pure Hub-and-Spoke Topology Site B In a pure hub-and-spoke 田 o topology, there is only one leased line from the hub site to each other site Very inexpensive Very unreliable Leased Leased Line Line Site D ew companies use either of these extreme topologies They have some backup links 7-137-13 Figure 7-3: Full Mesh and Pure Hub-and-Spoke Topologies for Leased Line Data Networks Pure Hub-and-Spoke Topology OC3 Leased Line Site A Site B Site C Site D T3 Leased Line T3 Leased Line In a pure hub-and-spoke topology, there is only one leased line from the hub site to each other site. Very inexpensive. Very unreliable. Few companies use either of these extreme topologies. They have some backup links