Which statement is correct regarding exception traffic on Junos devices?
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A. B. C. D.B
The correct answer is B. The Junos OS has a built-in rate limiter for exception traffic.
Explanation:
On a Junos device, exception traffic refers to traffic that is generated by the device itself to report errors or events to the system administrator. This type of traffic is sent to the Routing Engine (RE), which is responsible for managing the device's control plane.
The Junos OS includes a built-in rate limiter for exception traffic to prevent the RE from being overwhelmed by a flood of messages. The rate limiter is configurable, meaning that you can adjust the rate at which the device generates and sends exception traffic.
Option A is incorrect because it suggests that the rate limiter is configurable for exception traffic itself, which is not the case. The rate limiter is configurable, but it applies to all types of traffic, including exception traffic.
Option C is incorrect because the Junos OS does provide congestion control for exception traffic sent to the RE. The rate limiter mentioned above is one example of this congestion control.
Option D is incorrect because not all exception traffic destined for the RE is sent over the out-of-band management link. Some types of exception traffic may be sent over the in-band control link or other interfaces, depending on the nature of the event or error being reported.
In summary, the correct answer is B. The Junos OS has a built-in rate limiter for exception traffic to prevent the RE from being overwhelmed by messages.