By default, if equal-cost paths exist for the same destination, which action will the router take?
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A. B. C. D.D
C. Load-balance traffic between the available paths.
When multiple equal-cost paths are available for the same destination, a Junos router will, by default, perform load balancing. This means that the router will distribute traffic among the available paths to optimize performance and ensure that no single path is overwhelmed.
Load balancing can be performed in several ways, including per-packet, per-flow, or per-destination. Per-packet load balancing sends each packet down a different path in a round-robin fashion, while per-flow load balancing sends all packets in a particular flow (determined by the source and destination IP addresses and port numbers) down the same path. Per-destination load balancing sends all traffic to a particular destination down the same path.
The load-balancing algorithm used by a Junos router can be configured using the "load-balance" statement in the routing options hierarchy. This statement allows you to specify the load-balancing method and criteria, such as the number of available paths and the type of traffic being sent.
It is important to note that load balancing can lead to out-of-order packet delivery, which can cause issues with certain applications. To mitigate this, Junos routers can be configured to use a load-balancing method that preserves packet order, such as per-flow load balancing.