Log messages may tell you about some events, either critical or not. To help you make sense of the importance of each message, IOS assigns each message a severity level.
Which of the following severity level means a Warning condition?

(A) 2
(B) 3
(C) 4
(D) 5

4 is the correct answer.

To help you make sense of the importance of each message, IOS assigns each message a severity level: the lower the number, the more severe the event that caused the message. The two top levels (Emergency and Alerts) are the most severe. Messages from this level mean a serious and immediate issue exists.

The next three levels (Critical, Error, and Warning), tell about events that impact the device, but they are not as immediate and severe. For instance, one common log message about an interface failing to a physically down state shows as a severity level 3 message.

IOS uses the next two levels (Notification and Informational) for messages that are more about notifying the user rather than identifying errors. The last level (Debugging) is used for messages requested by the debug command.

Numeral	Description
0	Emergency: System unusable
1	Alert: Immediate action needed
2	Critical: Critical condition—default level
3	Error: Error condition
4	Warning: Warning condition
5	Notification: Normal but significant condition
6	Informational: Informational message only
7	Debugging: Appears during debugging only