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Exam JN0-663 All Questions

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Exam JN0-663 topic 1 question 4 discussion

Actual exam question from Juniper's JN0-663
Question #: 4
Topic #: 1
[All JN0-663 Questions]


You manage an MX Series device which includes the configuration shown in the exhibit. Traffic marked with DSCP 000011 is entering the ge-1/0/4 interface at
102 Mbps. The traffic exits the device on the ge-1/0/5 interface. No other traffic is transiting the router.
In this scenario, what happens to traffic exceeding 100 Mbps?

  • A. Traffic exceeding 100 Mbps is redirected to a rate limiter.
  • B. Traffic exceeding 100 Mbps is buffered.
  • C. Traffic exceeding 100 Mbps is dropped.
  • D. Traffic exceeding 100 Mbps is forwarded.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️

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dix
Highly Voted 3 years, 6 months ago
After you create a custom classifier you need to apply it to an interface within the class-of-service stanza. Other hand, the interface ge-1/0/5 is Gbps then the traffic is not exceeded normally; I think the information is uncompleted, however if we suppose there is a 100Mbps rate limit then the packets are classified based on the least significant bit of an incoming packet’s CoS field, (1 -> high, 0 -> low), then the traffic exceeding 100Mbps should be dropped.
upvoted 8 times
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sandpit
Highly Voted 2 years, 11 months ago
The information is in question is not full, Interfaces & Scheduler-maps configurations are missing which is available on few other websites. From the schedulers config it shows "transmit-rate percent 10" for "med-pri-shceduler" which applies to ge-1/0/5 on exit interface. Percentage shows 10% of 1GIG interfaces which drops any traffic above 100m on Ge-1/0/5. So I stick with the answer "Dropped"
upvoted 5 times
CptBlack
1 year ago
Nope. "transmit-rate" by itself only **guarantees** a certain amount of bandwidth under **congestion**. The question clearly states that there is NO congestion by the way. Unless you add "rate-limit" parameter, the "transmit-rate" DOES NOT by itself police or discard traffic. So if no "rate-limit" is specified, and given that there is no congestion, all traffic will be forwarded out ge-1/0/5 (and "transmit-rate" in this case does nothing).
upvoted 1 times
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ztw3587t
Most Recent 1 year, 5 months ago
Selected Answer: D
D is correct. It considering the available information we can assume that the default scheduler is in action and the traffic will be forwarded.
upvoted 1 times
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Nikitas
3 years ago
One can’t assume a rate limit of 100M, there’s no policer specified. And the question specifically states that no other traffic is transiting the router. So, all traffic should be forwarded (Answer D). See here: https://www.juniper.net/documentation/us/en/software/junos/cos-security-devices/topics/concept/cos-scheduler-default-security-setting.html «By default, each queue can exceed the assigned bandwidth if additional bandwidth is available from other queues.»
upvoted 3 times
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Juniperguy
3 years, 3 months ago
Yeah, also agree there is missing some information here.
upvoted 2 times
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