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In Packet Tracer 7.0:

After directly connecting two switches or a router and switch, pinging the neighboring device always fails on the first one or 2 attempts (i.e. only 4/5 or 3/5 ping attempts are successful.)

screenshot-icmp

Is this an artifact of the PT simulation or is this an expected behavior on a "new" network whose hosts have never communicated with the switch before (ARP resolution?)

  • Please, never use an image for text. Copy the text, paste it into your question, and use the Preformatted text feature ({}) on it. – Ron Maupin Dec 23 '16 at 21:51
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This actually happens in the real world, too. On ethernet, and other protocols that use MAC addresses, it is due to ARP. You will drop one or two initial pings. It can happen, too, with frame relay, depending on how you have it configured.

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