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.