Syslog explained

Syslog is a standard for message logging. Syslog messages are generated on Cisco devices whenever an event takes place – for example, when an interface goes down or a port security violation occurs.

You’ve probably already encountered syslog messages when you were connected to a Cisco device through the console – Cisco devices show syslog messages by default to the console users:

R1#
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down

This is because the logging console global configuration command is enabled by default. SSH and Telnet users need to execute the terminal monitor EXEC mode command in order to see the messages:

R1#terminal monitor
R1#
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up

In the example above you can see that the logged in user executed the terminal monitor command. Because of that, the telnet user was notified via a syslog message when the Gi0/1 interface went up a couple of moments later.

It is recommended to store the logs generated by Cisco devices to a central syslog server. To instruct a device to send logs to the syslog server, we can use the logging IP_ADDRESS command:

R1(config)#logging 10.0.0.10

Now, logs generated on R1 will be sent to the syslog server with the IP address of 10.0.0.10. Of course, you need to have a Syslog server (e.g. Kiwi syslog) installed and configured.

NOTE
It is also possible (and recommended) to use specify hostname instead of the IP address in the logging command. The command is logging host HOSTNAME.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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