Hop - You'll notice that as you go down the Trace Graph from top to bottom, the Hop number increments. What the Hop number shows you is that, for instance, data from you to the target hits the device at Hop 1 first, and then goes to Hop 2, etc. Those hops you see are most likely network routers or servers, but they really could be anything that will forward our Ping requests.
PL% - The percentage number of data packets that have been lost in the current Sample Set. So if you have your Samples to Include: set to 10, and five of the last ten traces PingPlotter sent to that hop didn't even make it back to PingPlotter, your PL% for that hop will be 50. So PL%, or packet loss percent, gives you a number at a glance for that hop of how many packets have made it out and should have made it back. Obviously a high packet loss percentage here isn't a good thing.
IP - The IP address for that hop.
DNSName - The DNS name for that hop. If you're seeing a ------------ instead of a name, PingPlotter wasn't able to get DNS information for that device.
Avg - The average response time in milliseconds for the number of samples in that Sample Set.
Cur - The Cur column shows you the round trip time (the Ping time) in milliseconds for data to make it to that hop and back again. Another term for this round trip time is latency.
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