CCNA 200-125 Exam: IP SLA Questions With Answers

CCNA 200-125 Exam: IP SLA Questions With Answers

  1. Which function of the IP SLAs ICMP jitter operation can you use to determine whether a VoIP issue is caused by excessive end-to-end time?
    • A. round-trip time latency*
    • B. packet loss
    • C. jitter
    • D. successive packet loss
  2. Which statement about the IP SLAs ICMP Echo operation is true?
    • A. The frequency of the operation specified in milliseconds.
    • B. It is used to identify the best source interface from which to send traffic.
    • C. It is configured in enable mode.
    • D. It is used to determine the frequency of ICMP packets.*

    Show (Hide) Explanation/Reference
    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

  3. What IP SLA ICMP Echo measures?
    • A. Packet loss
    • B. Congestion
    • C. Hop-by-hop “something”
    • D. End-to-end response time*
    • E. ?

    Show (Hide) Explanation/Reference
    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

  4. 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

    Show (Hide) Explanation/Reference
    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

  5. Which feature or utility enables a switch or router to monitor network performance and availability using a responder?
    • A. NetFlow
    • B. ping
    • C. traceroute
    • D. IP SLA*
  6. What are two characteristics of an ICMP echo-based IP SLA? (Choose two)
    • A. It measures traffic to determine the reliability of a connection from a Cisco router to a designated end device*
    • B. It can use RSPAN to report network statistics to a designated remote port
    • C. It generates continuous traffic to monitor network performance*
    • D. It aggregates traffic statistics for reporting on a configurable basis
    • E. It requires a remote device to log and maintain collected data
  7. 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*

    Show (Hide) Explanation/Reference
    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.

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