QOS REVIEW QUESTIONS

QOS REVIEW QUESTIONS

what is the formula for IOS weight for WFQ??
What is the virtual scheduling time + how is calculated??
What is the queue tail time for new packet in new flow??
What is CDT in wfq??
How do we enable wfq on interface??
Using legacy tools  how would reserve 128kb for ports 16384 to 32766?
what weight does reserve get in fair que??
Where would you see weighting in the cli?
with legacy tools how would priorise 128 kb for ports 16384 to 32766?
DO legacy custom que to allow for 3 protocols rtp (60 byte packets) icmp (100 byte packets) TCP 160 byte packets
Rtp should get 30 percent icmp should get 10 % tcp should 60 percent??
What is assigned to que 0 in custom queing??
How do we assign a priority que to the legacy custom que??
How do we legacy priority queing giving we want udp rip as the top http in middle lowest would be traffic going to 10.229.11.11
How does priority queing work as regards allocation to ques?
Enable legacy wred the weight constant should be 4 it should start dropping at 11 packets and tail drop 12 for prec 6
What is flow based wred and how do we enable?
What goes to the spd extended headroom que?
what goes to spd headroom que??
what happens if either que fills??
How would you set threshold for spd?
What is the difference between spd in normal mode and spd in aggressive mode?
What payload compression uses min cpu but high memory + how do you configure?
what payload compression uses high cpu but little memory + how do you configure
How do you enable payload compression of particular dlici??
How could we get around an issue with small packets + large packet headers for both tcp and rtp??
How do you apply this and how do you limit connections??
How do we configure multilink and interleave to max delay of 10ms for packets
What is the formula for fragment size?
How do you configure legacy traffic shaping first effecting all traffic and secondly affecting subset?
Whats the bc in GTS if you have CIR 128k and TC 10 ms?
WHat is the problem with setting bc 1000 bytes if your average packet is 1500 bytes?? How does IOS get around this
problem?
What is solution to deal with under sending as periods of quietness is the transmission?
Maximum  Burst for BE??
What is BE set to in GTS if it is not specfied?
How can we use legacy rate limiting to limit access to a host 150.1.1.1 to 256000 if the traffic confirms it should
be set to prec 1 if it does not it is set to prec 0
What is the bc in legacy rate limiting for 128kb at 10ms TC??
What is bc when we use the drop option in legacy car??
If we do not specify bc in legacy car what is set to?
What would be usual be value?
how could you with 1 line match ip prec 4 and 6 in car?
What is fecn??
What is becn??
How do we enable router to use fecn??
how do we enable gts on frame relay interface
what is the min rate + how to we enable?
How would we traffic shape a particular dlci using legacy commands?
How could we get the router to use fecn and becn on a singular dlci?
How could we change vc to use fair que using legacy commands?
How could we use pq at per vc level using legacy commands?
How could we use cq at per vc level using legacy commands?
How can we fragment at per vc level using legacy??
how do you work out the size of the fragment using legacy??
How do you apply per vc rtp priority using legacy??
How do Apply tcp header compression to multiple dlci bar one using legacy??
How do you limit the frame relay pseudo bcast que?
what is the legacy way of setting de marking say for all packets gt 64?
How would you match icmp with packet lenght of 1001 using mqc??
What is the policed rate for bandwidth 128 reservation??
What weight do specfic classes get in cbwfq?
How could we make template of bandwidth reservation given we have multiple different speed intefaces?
How would apply priority for traffic class and give all the remaining bw to another class??
How does priority reservation behave during congestion vs when network is not conjested
How do you apply mqc wred?
How would change a class default que to be fifo??
what is ecn and how to we apply it??
Create MQC GTS with CIR 384k and TC 20 MS?
WHat is BE if not specfied in MQC GTS?
If we are using CBWFQ bw reservation etc and we want to shape to 384k cir how would we do it?
Police http to 128000 with 200 ms tc if it keeps to cir set prec 0 if it goes over set prec 0 if it goes over burst drop it?
What type of policer is the above?
How does be behave in this type of policing?

OK we have 3 router on lan segment r1 r2 and r3. R1 wants to limit overall traffic to 128k and it also when to limit r2 64000 and r3 6400
how would we configure?
We have been told by our provider our CIR 64k and PIR is 128k. Our cir burst is 300 mbs while our PIR bust is 400 ms
How are the CIR and PIR buckets filled??
SHape http traffic to a peak rate of 128k?
What is the formula for PIR in shaping?
We want to do a template for MQC policing to apply to different speed interfaces how do we do this?
How do we account for tcp small payloads with large packet headers is there way optimize using mqc?
How do shape a singular dlci using mqc and no legacy commands??
in the above set de on all traffic?
how can we use mqc with legacy frts?
how can we set fragment of 480 on interface?
We have guaranteed rate of 128k and pir rate of 192k on our frame relay circuit. The only delay sensitive traffic we send is voice. But we do not
want to shape to 128k just to keep voice in the cir. We only want to shape to 128k when voice is in the que how can we do
this?
How do you fragment and interleaving with mqc??
How can you ensure gre traffic is not considered just one flow by mqc and recieves proper qos treatment?

How does rsvp router reserve from host x to host y what messages does it use?
reserve 64k of 96k link using rsvp?
what weight does rsvp?
How can we keep track of rsvp on shared ethernet segment?
what weight does rsvp get?
What is AF13 in decimal?
What is AF13 ip precedence value
What is drop preference?
how can we map cos - dscp on ethernet switches? so that cos 2 is changed to dscp26
how can we map ip prec- dscp so that ip prec 5 is dscp 46?
what is the default incoming marking action when mls qos is not enabled?
What is the default incoming marking action when mls qos is enabled?
how could we trust dscp in from a router on the switch?
How could we remark all cos values to 4 coming in an interface?
How could we trust ip prec but remark all cos to 4?
For untagged packets how can we mark cos 1?
How can we reset dscp but pass cos??
how do you read sh mls qos int fa0/16 stats?
how would you at layer 2 Set ipx traffic to dscp ef??
We want to apply a qos policy to all ports in vlan what is the best way to do this and how would you configure?
Apply policing at layer 2 to police to cir 128k
what command do you need to do to allow setting cos in mqc class map??
If traffic exceeds we do not want to drop but remark to CS2 how do we do that?
S1 and S2 are connected and we have set to trust dscp incoming on the port connected to a router on s1 when it
gets to s2 it has default marking what is the problem?
We want to limit all classes in mqc to 128k shaped how do we do that?
How many ingress que are there on 3560 switch interface?
how can we assign cos 5 to que 1 and all other cos values to que 2 on ingress ques?
How can we set a pq?
How does the pq work with bw assigned??
what configurable threshold are there on ingress?
How many ques are there on egress interface on 3560?
what is difference between shaped round robin and shared round robin?
How do you enable shaped round robin?
how do you set a pq on 3560 and what que number is it?
how can we limit egress sending rate?
how can we map dscp/cos values to ques on egress?
What is queue set how do you configure it?
how on input could we change cs 0 to cs 1?
How could we match .txt or text with nbar?