In an IS-IS network, which device represents the pseudo-node?
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A. B. C. D.A
In an IS-IS (Intermediate System to Intermediate System) network, a pseudo-node represents a logical router that is created by the IS-IS routing protocol to optimize routing within the network. A pseudo-node is created when there are multiple parallel paths available between two routers in the same level of the hierarchy.
In this scenario, the IS-IS protocol will elect one router as the designated intermediate system (DIS) to represent the pseudo-node, which will simplify the routing process by reducing the number of adjacencies required between the routers.
Therefore, the correct answer to the question is A. a designated intermediate system. A designated intermediate system is a router in the IS-IS network that has been elected to represent the pseudo-node.
Option B, an area border router (ABR), is a router that connects multiple IS-IS areas and performs routing between them. However, an ABR does not represent a pseudo-node in the network.
Option C, a router with an IS-IS export policy, is not directly related to the concept of a pseudo-node in the IS-IS network. An export policy is a configuration on a router that controls the routes that are advertised to other routers in the network.
Option D, a router connected to the backbone, is also not directly related to the concept of a pseudo-node. The backbone is the highest level of the IS-IS hierarchy, and routers connected to it are responsible for forwarding traffic between different areas in the network. However, being connected to the backbone does not automatically make a router a pseudo-node.