Final answer:
The severity level of the SYSLOG message indicating that an interface changed state to up is 'Notifications'. This level signifies significant events that are not error conditions. The correct option is a. Informational
Step-by-step explanation:
The severity level of the given SYSLOG message, which is 00:00:47: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to up, is Notifications. In the context of SYSLOG messages, a severity level of 'Notifications' indicates that the event is significant but not indicative of a problem in the network.
This level of severity is commonly associated with normal, but significant, events on a network device such as a router or switch. For example, when an interface changes its state to 'up', it means that the interface has become operational, which is useful information for network administrators but not something that typically requires immediate action.
The severity level of the SYSLOG message is an informational message.
Severity levels in SYSLOG messages indicate the importance of the message. They range from 0 to 7, with 0 being the most severe. In this case, the message indicates that the interface GigabitEthernet0/2 has changed state to up. This is an informational message that simply provides information about the state change.
Other severity levels include notifications, warnings, errors, and alerts, which indicate increasing levels of severity and urgency.
The correct option is a. Informational