As for monitoring, there are a number of tools. So free, some not. You could use something like cacti if you need a low cost/free approach to see CPU, memory, and port activity.
I've faced network monitoring myself using tools like zabbix, nagios and pandora.
Zabbix has a very bad visual console and it's to complex to manage. You can find information on zabbix.com
Nagios is unclear and very difficult. There isn't much information about it. (nagios.com)
Pandora is the one I'm currently using. It's user friendly and quite easy to manage. It can monitor networks and servers. You can find more information here: http://pandorafms.com/Home/Home/?lang=en
After trying many tools (including above mentioned) we started using CloudView NMS http://www.cloudviewnms.com . This one is is simple to use and powerful . It can monitor anything via standard protocols like SNMP..... CloudView has some Cisco specific GUI as well which is good for monitoring. alert e-mails, etc.... However to CONFIGURE Cisco devices you will have to use GUI tools which come with the devices (like web interface). You can easily integrate these tools in CloudView NMS to run by double-click/right mouse click on a Cisco device icon in CloudView map. Or you can use ssh (like Putty) as was suggested above. You can also integrate ssh/putty call in CloudView NMS as we did.
During the last few years, a whole new networking industry is trying to bootstrap itself. Called Software Defined Networking. SDN can mean a hunderd different things if you listen to a hundred different people. But one thing it tries to be is a solution that makes managing and configuring networks easier. Someone might do that some day, but I am skeptical that "just SDN" will be the answer.
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