For end to end physcial links:
1. Delay
2. Jitter
3. Loss
For TCP traffic:
1. TCP RTT (Round Trip Time)
2. TCP SRT (Server Response Time)
3. TCP Re-transmission behavior
Tools
1. Cisco QoS + IP SLA
http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a00802d5efe.html
http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsjitter.html#wp1054785
Riverbed, Bluecoat, Ipanema
Yes dear WAN requirements are evolving rapidly as enterprises become more frustrated with the high cost and complexity of MPLS networking. The best known commercial WAN optimization solution providers are Riverbed Technology, Citrix, Cisco, Juniper Networks, Silver Peak, Sangfor, Blue Coat Systems and Array Networks to name a few.
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