I need to do some check on a network in terms of bandwidth, redundant links to check for any upgrade needed.
currently i don't have any software.
how can check this?
As far as the WAN links are concerned you can always check the utilisation on your wan ports to find out your utilisation.
You can also make use of freeware tools to monitor the link utilisation.
If you see the traffic peaking up always during the normal working hours then better go for an upgrade on the same..