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JN0-643 · Question #140
JN0-643 Question #140: Real Exam Question with Answer & Explanation
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Question
Based on the configuration in the exhibit, why are you seeing drops in the best-effort queue on the SRX Series platform? 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 ...)
Options
- AThe drop-profile fill level is set too low.
- BPackets are dropped by a firewall policy.
- CThe best-effort queue is being shaped.
- DThe scheduler is not being applied correctly.
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