Refer to the Exhibit.
You manage an MX series router (with 100 ms buffer size per port) that includes the configuration shown in the exhibit. Traffic marked with DSCP 000101 is entering the ge-1/0/4 interface at 102 Mbps. The traffic exits the device on the ge-1/0/5 interface. There is no other traffic transiting the router. What happens to traffic exceeding 100 Mbps?
A.
Traffic exceeding 100 Mbps is forwarded.
B.
Traffic exceeding 100 Mbps is buffered.
C.
Traffic exceeding 100 Mbps is redirected to a rate limiter.
D.
Traffic exceeding 100 Mbps is dropped.
Someone can help on this one ?
Ok i think i found the answer !
It’s because the link have a speed of 100Mbit/s, the buffer is at 100 millisecond and the percent of the buffer for high-pri-scheduler is 20%.
To calculate the buffer size :
100 Mbit/s * 0.2 (20%) * 100000,000 microsecond = 2.000.000 bit = 2Mbit
The rate is at 102Mbit/s so the buffer is already full !
Answer D
I think the is D according with this:
“• rate-limit—(Optional) Limit the transmission rate to the specified amount. You can configure this option for all 8 queues of a logical interface (unit) and apply it to shaped or unshaped logical interfaces. If you configure a zero rate-limited transmit rate, all packets belonging to that queue are dropped. On IQE PICs, the rate-limit option for the schedulers’ transmit rate is implemented as a static policer. Therefore, these schedulers are not aware of congestion and the maximum rate possible on these schedulers is limited by the value specified in the transmit-rate statement. Even if there is no congestion, the queue cannot send traffic above the transmit rate due to the static policer.”
http://www.juniper.net/documentation/en_US/junos15.1/topics/usage-guidelines/cos-configuring-scheduler-transmission-rate.html
The information related with buffer-size is just a distraction, because, as I can understand from previous text, if rate-limit is implemented, buffer-size parameter doesn´t have any effect, it will simply drop any packets which are in excess of the configured transmit-rate.