You are configuring CoS schedulers on an M Series router. For some queues, you want to limit
throughput to the configured transmit rate, and buffer excess traffic.
Which two transmission rate options can you use? (Choose two.)
A.
exact
B.
rate-limit
C.
remainder
D.
shaping-rate
Explanation:
http://www.juniper.net/techpubs/en_US/junos12.2/topics/reference/configuration-statement/transmit-rate-edit-cos.html
Should be A and B
there is no shaping-rate option ….A & B correct answer
transmit-rate (rate | percent percentage | remainder) ;
i think the rate-limit option will not buffer excess traffic, so the answer should be A, D
http://kb.juniper.net/InfoCenter/index?page=content&id=KB14597
http://forums.juniper.net/t5/Routing/JUNOS-QOS-transmit-rate-exact-vs-shape-rate/m-p/199317#M9450
rate-limit will drop traffic (http://www.aiotestking.com/juniper/what-happens-to-traffic-exceeding-100-mbps-7/).
A & D.
so how shaping rate and guaranteed rate teat traffic and transmit rate and buffer size treat traffic?
Correct answer A & D
3.Configure the traffic-control profiles that can be applied to the scheduler node:
[edit]
class-of-service {
traffic-control-profiles {
tcp-basic-rate { # Specify a scheduler map and traffic controls
shaping-rate 10m;
}
tcp-premium-with-4-queues { # Specify a scheduler map and traffic controls
scheduler-map smap-premium-4q;
shaping-rate 20m;
guaranteed-rate 10m;
delay-buffer-rate 5m;
http://www.juniper.net/techpubs/en_US/junos15.1/topics/example/cos-subscriber-access-adjustments-subscriber-local-loops.html
A & D is correct.
Without reading too much into the grammar, we are being asked which rate options are fit for purpose with a view to buffering if required:
admin@J8-PE# set class-of-service schedulers MY_SCH ?
Possible completions:
Execute this command
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don’t inherit configuration data from these groups
> buffer-size Queue transmission buffer size
> drop-profile-map Assign drop profile to a loss priority and protocol
excess-priority Priority in the excess region
> excess-rate Excess bandwidth sharing proportion
priority Scheduling priority
> shaping-rate Shaping rate
> transmit-rate Transmit rate
“shaping rate” will do the job.
“transmit-rate exact” will also do the job.