# computer A
$ ping 192.168.0.11
# result: Destination Host Unreachable

# computer B
$ ping 192.168.0.10
# result: works
# 64 bytes from 192.168.0.10: icmp_seq=20 ttl=64 time=1.76 ms

# computer A (after computer B pinged A)
$ ping 192.168.0.11
# result: works
# 64 bytes from 192.168.0.11: icmp_seq=1 ttl=64 time=2.65 ms