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IP SLA Questions

November 1st, 2017 Go to comments

Question 1

Question 2

Explanation

The ICMP Echo operation measures end-to-end response time between a Cisco router and any devices using IP. Response time is computed by measuring the time taken between sending an ICMP Echo request message to the destination and receiving an ICMP Echo reply. Many customers use IP SLAs ICMP-based operations, in-house ping testing, or ping-based dedicated probes for response time measurements.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html

Question 3

Explanation

The Internet Control Message Protocol (ICMP) Echo operation measures the end-to-end response time between two devices that use IPv4. The response time is computed by measuring the time taken between sending an ICMP Echo request message to the destination and receiving an ICMP Echo reply.

An IP SLA can be used to performs network performance monitoring, including measure the latency, packet loss, jitter and response time in the network. The example below shows how to configure an IP SLA ICMP Echo (send an ICMP request to 192.168.1.254 every 300 second with a timeout of 500ms):

Device(config)#ip sla 1

Device(config-ip-sla)#icmp-echo 192.168.1.254
Device(config-ip-sla-echo)#frequency 300 //send an ICMP
Device(config-ip-sla-echo)#timeout 500
Device(config-ip-sla-echo)#exit
Device(config)#ip sla schedule 1 start-time now

Question 4

Explanation

The ICMP Echo operation measures end-to-end response time between a Cisco router and any devices using IP. Response time is computed by measuring the time taken between sending an ICMP Echo request message to the destination and receiving an ICMP Echo reply. Many customers use IP SLAs ICMP-based operations, in-house ping testing, or ping-based dedicated probes for response time measurements.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html

Question 5

Question 6

Question 7

Explanation

To measure end-to-end reponse time we have to use ICMP echo to continuously ping to a remote device. The difference between ICMP path echo and ICMP echo is the former can measure hop-by-hop response time on its whole path while the latter can only measure to a specific destination.

Comments (22) Comments
  1. sal
    February 6th, 2017

    where can I find questions . only ans here

  2. IN ASS
    March 25th, 2017

    in you fuken ass

  3. adm
    April 6th, 2017

    fsdasfas

  4. Abdullah
    April 11th, 2017

    HI,
    You can find the questions when search for “mediafire” in 9tut search.

    Regards

  5. Orval
    June 13th, 2017

    Dose anyone have the full version for this dumps?https://drive.google.com/open?id=0B5mAFqgydmCzc3BmR214LWFuTDg

  6. Gabriel
    June 28th, 2017

    Confirming the 747q dumps are valid. It’s the complete version of the one posted by Orval

  7. Xmen
    June 30th, 2017

    Hi, can anyone explain to me question 3 and Q4? seems to be same… to me. Thanks

  8. @Anon
    July 9th, 2017

    in Q3 they ask what parameter is measured by IMCP ECHO
    in Q4 they ask for why you will use icmp echo in troubleshooting

  9. Anony
    July 13th, 2017

    In the 9tut dump, it says that question 4’s answer is C:

    Which function does IP SLA ICMP ECHO operation perform to assist with troubleshooting?
    A. one way jitter measurement
    B. congestion detection
    C. hop-by-hop response time
    D. packet-loss detection

    Really? Is C really the correct answer?? It seems that the correct answer should be D??

  10. McMacOff
    August 18th, 2017

    “`To monitor ICMPPath Echo performance on a device, use the IPSLAs ICMPPath Echo operation. An ICMP
    Path Echo operation measures end-to-end and hop-by-hop response time between a Cisco device and other
    devices using IP. ICMP Path Echo is useful for determining network availability and for troubleshooting
    network connectivity issues.“`
    Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/xe-3s/sla-xe-3s-book/sla_icmp_pathecho.pdf

    Answer C to question 4 is correct.

  11. vignesh
    September 1st, 2017

    hi could any one send the latest dumps to my inbox
    vigneshppit(@)gmail(dot)com

  12. anon
    September 10th, 2017

    Q2 the explanation is about what the icmp echo is and how it is used.

    The answer (D) seems to indicate the explanation should be talking about setting how often the echos are sent out.

  13. anon
    September 10th, 2017

    Q4. if IP SLA ICMP ECHO is measuring the round trip time as the linked documentation seems to indicate, then C would not be the best use of it except in local network.

    B should be a valid answer.

  14. anon
    September 10th, 2017

    never mind last comment. head up my ass.

  15. TIWARI
    March 12th, 2018

    Thanks a million 9tut

  16. Jake
    March 29th, 2018

    Q151 and Q195 are almost identical on the most recent dump, but the answers are different.
    So what the frigg? Which asnwer is correct?

    151.Which function does IP SLAs ICMP Echo operation perform to assist with troubleshooting?
    A. one way jitter measurement <—Answer
    B. congestion detection
    C. hop-by-hop response time
    D. packet-loss detection

    195.Which function does IP SLA ICMP ECHO operation perform to assist with troubleshooting?
    A. one way jitter measurement
    B. congestion detection
    C. hop-by-hop response time <—- Answer
    D. packet-loss detection

  17. cthelite
    March 30th, 2018

    PT1
    Q2, Q3, and Q4 are all related to ICMP ECHO. NONE of the 3 refer to ICMP PATH ECHO, which is a slightly different measurement.
    ICMP JITTER measures: hop-by-hop jitter, packet loss, total delay
    ICMP ECHO measures: Round Trip Delay for the entire path
    ICMP PATH ECHO measures: Round Trip Delay hop-by-hop

  18. cthelite
    March 31st, 2018

    PT2
    Q4: Which function does IP SLA ICMP ECHO operation perform to assist with troubleshooting?
    … To start, let’s look at SLAs and tshooting… from Cisco:

    IP SLAs Operation Threshold Monitoring –
    To support successful service level agreement monitoring … and save troubleshooting time…
    IP SLAs can send SNMP traps that are triggered by events such as the following:
    • Connection loss
    • Timeout
    • Round-trip time threshold
    • Average jitter threshold
    • One-way packet loss
    • One-way jitter
    • One-way mean opinion score (MOS)
    • One-way latency

    The above is more about SLAs in general, but does provide a good list of troubleshooting events, which is applicable to the question. Now let’s pick the most appropriate answer:

    A) one way jitter measurement
    B) congestion detection
    C) hop-by-hop response time
    D) packet-loss detection

    one-way jitter (A) & congestion (B) are more appropriately measured by the IP SLA UDP jitter operation. UDP is a higher layer in the OSI model. Remember, ICMP is L3 (IP). So IP SLA UDP operations provide more granularity, and are more appropriate for one-way tests.

    (From Cisco):
    UDP jitter operations are capable of measuring the following:
    – Per-direction jitter (source to destination and destination to source)
    – Per-direction packet loss
    – Per-direction delay (one-way delay)
    – Round-trip delay (average round-trip time)
    As paths for sending and receiving data may be different (asymmetric), the per-direction data allows you to more readily identify where congestion or other problems are occurring in the network.

    So “A” and “B” are not good answers to the question about simple ICMP ECHO.

    “Hop-by-hop” measurements (C) are best measured by IP SLA “PATH” ECHO, not just ECHO.
    PATH ECHO is more associated with “traceroute” (hop-by-hop) and ECHO is associated with “ping”… note the question doesn’t include “PATH” echo… again from Cisco:

    The IP SLAs ICMP Path Echo operation records statistics for each hop along the path that the IP SLAs operation takes to reach its destination. The ICMP Path Echo operation determines this hop-by-hop response time between a Cisco device and any IP device on the network by discovering the path using the traceroute facility.

    So “C” is not a good answer.

    This leaves “D”. Let’s look at an example SHOW IP SLA STATS:

    Switch#show ip sla statistics aggregated
    Round Trip Time (RTT) for Index 1
    Type of operation: icmp-echo
    Start Time Index: 15:10:17.665 EDT Fri May 21 2010
    RTT Values
    Number Of RTT: 24
    RTT Min/Avg/Max: 1/1/4 ms
    Number of successes: 24
    Number of failures: 0

    Stats show basic info for an “icmp-echo” operation such as round trip transit (RTT) times and echo failures (PACKET LOSS). An echo is an ICMP packet, thus a failure to return is a packet loss.

    “D” is confirmed the best answer.

  19. AB
    April 21st, 2018

    @9tut
    In the quiz, the answers to below questions are ICMP PATH JITTER & ICMP PATH ECHO intsead of it being ICMP ECHO & ICMP PATH ECHO. Please rectify – Thanks

    Which two IP SLA operations can you use to measure the end-to-end response time for all IP traffic between a Cisco router and an end device?
    A. ICMP path echo
    B. UDP echo
    C. ICMP path jitter
    D. UDP jitter
    E. TCP connect
    F. ICMP echo

    Answer: A F

  20. 9tut
    April 21st, 2018

    @AB: We checked but found no problem. Could you please try again?

  21. AB
    April 22nd, 2018

    @9tut
    Just re-did the quiz again. Strange, it works now. I guess no issue now :)

  22. albama
    June 9th, 2018

    @9tut and @cthelite
    which answer is correct int he question IP SLA ? because i know if march pdf is answer correct or are wrong.
    very thanks by said.

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