Role High Availability Load Balancer DNS Load Balancing

Standard Edition Server

Not Available

N/A

N/A

Enterprise Edition Front-End server

Deploy multiple servers in a Pool and use load balancing

Yes

Yes

Back End Server

SQL Server uses Windows Clustering for High Availability

No

No

A/V Conferencing Server

Deploy Multiple Servers in a pool. load balancing not required

N/A

N/A

Edge Server

Deploy Multiple Servers in a pool and use load balancing

Yes

Yes

Mediation Server

Deploy Multiple Servers in a pool and use load balancing

Yes

Yes

Monitoring

Standby Server

(MSMQ on the Front-End queues messages in the event of a failure)

No

No

Archiving

Standby Server

(MSMQ on the Front-End queues messages in the event of a failure)

No

No

Director

Deploy Multiple Servers in a pool and use load balancing

Yes

Yes

File Server

Use Windows Clustering or Distributed File System

No

No