You want to implement a network topology that provides the best balance for regional topologies in
terms of the number of virtual circuits, redundancy, and performance while establishing a WAN
network. Which of the following network topologies will you use to accomplish the task?

A.
Bus topology

B.
Fully meshed topology

C.
Star topology

D.
Partially meshed topology

Explanation:
According to the scenario, you want to implement a network topology that provides
the best balance for regional topologies in terms of the
number of virtual circuits, redundancy, and performance while establishing a WAN network.
Therefore, you will use the partially meshed
topology. Since in the partially meshed topology, all nodes are not connected to each other,
nonmeshed node communicates with another
nonmeshed node by sending traffic through one of the fully connected routers.
Answer option A is incorrect. This topology is not used for WAN networking.
Answer option B is incorrect. In the fully meshed topology, every node has a direct path to one
another. However, this topology has the
following disadvantages:
It requires a large number of virtual circuits that are required for every connection between routers.
Due to this approach, there will be a large number of packets and broadcast replications.
It increases routers’ overhead.
Answer option D is incorrect. In the star topology, a single internetworking hub provides access from
remote networks into the core router.
The star topology minimizes tariff costs. However, it has the following disadvantages:
If the central router fails, there will be no other backup.
Since all traffic intended for the centralized resources goes through the central router, it becomes
the bottleneck of overall performance
for accessing the centralized resources.
The star topology is not scalable.