Which of the following topology terms most closely describe the topology created by a Metro Ethernet Tree (E-Tree) service? (Choose two answers.)
- Full mesh
- Partial mesh
- Hub and spoke
- Point-to-point
Explanation: A Metro Ethernet E-Tree service uses a rooted point-to-multipoint Ethernet Virtual Connection (EVC), which means that one site connected to the service (the root) can communicate directly with each of the remote (leaf) sites. However, the leaf sites cannot send frames directly to each other; they can only send frames to the root site. Topology design like this that allows some but not all pairs of devices in the group to communicate is called a partial mesh, or hub and spoke, or in some cases a multipoint or point-to-multipoint topology.
Of the incorrect answers, the full mesh term refers to topology designs in which each pair in the group can send data directly to each other, which is typical of a MetroE E-LAN service. The term point-to-point refers to topologies with only two nodes in the design, and they can send directly to each other, typical of a MetroE E-Line service.
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