300-420 · Question #375
An architect must design a topology for a WAN network that satisfies these requirements: - Devices must be able to make informed decisions. - Suboptimal paths are allowed only in case of a failure…
The correct answer is A. full mesh. A full mesh topology connects every device directly to every other device. This satisfies all three requirements: (1) because every node has a direct link to all peers, routing protocols can exchange complete topology information, enabling truly informed path decisions; (2) in…
Question
An architect must design a topology for a WAN network that satisfies these requirements:
- Devices must be able to make informed decisions.
- Suboptimal paths are allowed only in case of a failure.
- Backup paths must always be available.
Which topology must the architect select?
Options
- Afull mesh
- BClos
- Cpartial mesh
- Dhub and spoke
How the community answered
(16 responses)- A81% (13)
- C6% (1)
- D13% (2)
Explanation
A full mesh topology connects every device directly to every other device. This satisfies all three requirements: (1) because every node has a direct link to all peers, routing protocols can exchange complete topology information, enabling truly informed path decisions; (2) in normal operation the optimal direct path is used, and a suboptimal alternate path is only taken when the primary link fails; (3) because N-1 redundant paths exist for each node, a backup is always available regardless of any single failure. Hub-and-spoke fails because the hub is a single point of failure with no backup path. Partial mesh cannot guarantee a backup path exists for every device pair. Clos is a data-center switching fabric architecture, not a WAN topology.
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