LAN and WAN Bandwidth requirment

Dear all,

What is bandwidth required (min ,max and avg) in LAN as will as WAN. And how can we measure LAN and WAN speed please of performance, what tools can be used to see sap related data speed on LAN and WAN. when I ping from sap client machine to sap server its shows

Bytes=32 time<10ms TTY=255

Network admin says that time is between 1 to 40 and 20 is also good

Please guide me about that issue

Regards

shahid