We assume that you are familiar with command line. You can use following commands.

To check status of apache

systemctl status httpd.service

To start apache

systemctl start httpd.service

To Stop apache

systemctl stop httpd.service

Similarly you can use commands for mysql like systemctl status mysql.service

For Network Service systemctl status network.service

For centos 6 you can simply run following commands 

For apache service httpd status  or /etc/init.d/httpd status

For MySql service mysql status or /etc/init.d/mysql status

For Network service network status or /etc/init.d/network status

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