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Exam JN0-643 topic 2 question 84 discussion

Actual exam question from Juniper's JN0-643
Question #: 84
Topic #: 2
[All JN0-643 Questions]

-- Exhibit --
user@router> show class-of-service scheduler-map two
Scheduler map: two, Index: 56974
Scheduler: sch-best-effort, Forwarding class: best-effort, Index: 26057
Transmit ratE. 1 percent, Rate Limit: exact, Buffer sizE. remainder,
Buffer Limit: exact, Priority: low

Excess Priority: unspecified -
Drop profiles:
Loss priority Protocol Index Name
Low any 1 <default-drop-profile>
Medium low any 1 <default-drop-profile>

Medium high any 1 <default-drop-profile>
High any 1 <default-drop-profile>

Scheduler: sch-expedited-forwarding, Forwarding class:
expedited-forwarding, Index: 10026
Transmit ratE. 1 percent, Rate Limit: none, Buffer sizE. 1 percent,
Buffer Limit: none, Priority: high

Excess Priority: unspecified -
Drop profiles:
Loss priority Protocol Index Name
Low any 1 <default-drop-profile>
Medium low any 1 <default-drop-profile>

Medium high any 1 <default-drop-profile>
High any 1 <default-drop-profile> user@router> show interfaces ge-0/0/1 extensive | find "CoS Information"
CoS information:

Direction : Output -
CoS transmit queue Bandwidth Buffer

Priority Limit -
% bps % usec
0 best-effort 1 10000000 r 0 low exact
1 expedited-forwarding 1 10000000 1 0 high none
Logical interface ge-0/0/1.823 (Index 74) (SNMP ifIndex 506) (Generation
139)
Flags: SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.823 ] Encapsulation: ENET2
Traffic statistics:
Input bytes : 1820224529
Output bytes : 6505980
Input packets: 1436371
Output packets: 75905
(... output truncated ...)
user@router> show interfaces ge-0/0/1 extensive | find "Queue Counters"
Queue counters: Queued packets Transmitted packets Dropped packets
0 best-effort 1343970 1343970 7105
1 expedited-fo 53987 53987
2 assured-forw 0 0
3 network-cont 0 0
Queue number: Mapped forwarding classes
0 best-effort
1 expedited-forwarding
2 assured-forwarding
3 network-control

Active alarms : None -

Active defects : None -
(... output truncated ...)
-- Exhibit --
Click the Exhibit button.
Based on the configuration in the exhibit, why are you seeing drops in the best-effort queue on the SRX Series platform?

  • A. The drop-profile fill level is set too low.
  • B. Packets are dropped by a firewall policy.
  • C. The best-effort queue is being shaped.
  • D. The scheduler is not being applied correctly.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️

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