Is the ping latency output displayed in microseconds or milliseconds by default?

• That's right, ping latency is measured in milliseconds, not microseconds by default.

Let's check in detail

Let's check if there are any differences between a regular ping and a ping using the -U option.

# ping 192.168.124.1
PING 192.168.124.1 (192.168.124.1) 56(84) bytes of data.
64 bytes from 192.168.124.1: icmp_seq=1 ttl=64 time=0.069 ms
6...