Which statement is true about Cisco IOS ping indicators?​

  • ‘!’ indicates that the ping was unsuccessful and that the device may have issues finding a DNS server.
  • ‘U’ may indicate that a router along the path did not contain a route to the destination address and that the ping was unsuccessful.
  • ‘.’ indicates that the ping was successful but the response time was longer than normal.
  • A combination of ‘.’ and ‘!’ indicates that a router along the path did not have a route to the destination address and responded with an ICMP unreachable message.​
Answers Explanation & Hints:

The most common indicators of a ping issued from the Cisco IOS are “!”, “.”, and “U”. The “!” indicates that the ping completed successfully, verifying connectivity at Layer 3. The “.” may indicate that a connectivity problem, routing problem, or device security issue exists along the path and that an ICMP destination unreachable message was not provided. The “U” indicates that a router along the path may not have had a route to the destination address, and that it responded with an ICMP unreachable message.

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