This can validate the reliability of the path to a speci?¬?ed system.
Table 4-13 lists possible output characters from the ping command output.
Example 4-19 ping and traceroute Commands
RouterA# ppiinngg 1100..11..11..1100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
RouterA# ttrraaccee 119922..116688..110011..110011
Type escape sequence to abort.
Tracing the route to 192.168.101.101
1 p1r1 (192.168.1.49) 20 msec 16 msec 16 msec
2 p1r2 (192.168.1.18) 48 msec * 44 msec
RouterA#
Table 4-13 ping Command Output characters
Character Description
! Indicates receipt of a reply
. Indicates that the network server timed out while waiting for a reply
U Indicates that a destination unreachable protocol data unit (PDU) was
received
Q Indicates source quench (destination too busy)
M Could not fragment
? Unknown packet type
& Packet lifetime exceeded
328 Chapter 4: LAN Connections
?– The traceroute command shows the routes that the packets take between network
devices. A device, such as a router or switch, sends out a sequence of User Datagram
Protocol (UDP) datagrams to an invalid port address at the remote host.
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