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Syslog Questions

February 6th, 2017 Go to comments

Question 1

Explanation

The “service timestamps log” command configures the system to apply a time stamp to logging messages. The time-stamp format for datetime is MMM DD HH:MM:SS, where MMM is the month, DD is the date, HH is the hour (in 24-hour notation), MM is the minute, and SS is the second. With the additional keyword msec, the system includes milliseconds in the time stamp, in the format HH:DD:MM:SS.mmm, where .mmm is milliseconds.

Question 2

Explanation

Syslog levels are listed below

Level Keyword Description
0 emergencies System is unusable
1 alerts Immediate action is needed
2 critical Critical conditions exist
3 errors Error conditions exist
4 warnings Warning conditions exist
5 notification Normal, but significant, conditions exist
6 informational Informational messages
7 debugging Debugging messages

The highest level is level 0 (emergencies). The lowest level is level 7. By default, the router will send informational messages (level 6). That means it will send all the syslog messages from level 0 to 6.

Question 3

Explanation

Syslog levels are listed below

Level Keyword Description
0 emergencies System is unusable
1 alerts Immediate action is needed
2 critical Critical conditions exist
3 errors Error conditions exist
4 warnings Warning conditions exist
5 notification Normal, but significant, conditions exist
6 informational Informational messages
7 debugging Debugging messages

If we specify “logging trap warning” then logging messages from “emergencies” to “warnings” are sent out.

Question 4

Explanation

Syslog levels are listed below:

Level Keyword Description
0 emergencies System is unusable
1 alerts Immediate action is needed
2 critical Critical conditions exist
3 errors Error conditions exist
4 warnings Warning conditions exist
5 notification Normal, but significant, conditions exist
6 informational Informational messages
7 debugging Debugging messages

The highest level is level 0 (emergencies). The lowest level is level 7. By default, the router will send informational messages (level 6). That means it will send all the syslog messages from level 0 to 6.

Question 5

Explanation

By default if we type “show logging” command we will see the Syslog logging has been enabled -> A is not correct.

syslog_logging.jpg

The syslog messages are stored in the internal buffer of the device. The buffer size is limited to few kilobytes. However, when the device reboots, these syslog messages are lost -> B is correct; C is correct; D is not correct.

Question 6


Explanation

From the second line of the output, we learned that Fa0/1 interface was shut down so we see the “changed state to administratively down”. The third and fourth line is the result of this action, which cause Fa0/1 interface “changed state to down” and the EIGRP neighbor relationship with 10.10.11.2 was down.

Comments (3) Comments
  1. Mark
    March 7th, 2017

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  2. Anonymous
    March 10th, 2017

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  3. Dick
    March 13th, 2017

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