cisco ping和traceroute返回结果

ping 返回结果解释：
 
!      Each exclamation point indicates receipt of a reply.
.      Each period indicates the network server timed out while waiting for a reply.
U      A destination unreachable error PDU was received.
Q      Source quench (destination too busy).
M      Could not fragment.
?      Unknown packet type.
&      Packet lifetime exceeded.
 

 

 

IP Traceroute返回结果解释：
 
*        The probe timed out
A        Administratively prohibited (example, access-list)
Q        Source quench (destination too busy)
I        User interrupted test
U        Port unreachable
H        Host unreachable
N        Network unreachable
P        Protocol Unreachable
T        Timeout
?        Unknown packet type