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IP SLA Questions

March 23rd, 2017 in ICND2 200-105 Go to comments

Question 1

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 2

Comments (1) Comments
  1. Kumo
    April 28th, 2017

    for Q2:
    An IP LSA ICMP-Echo operation can measure 2 facts:
    1. success/failure of the Echo
    2. the RTT

    RTT(round trip time) measures the DELAY from sending the ICMP Echo request until receiving the matching ICMP Echo reply.