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You have an Exchange Server 2013 organization that contains two Client Access servers and two Mailbox servers. You configure DNS round robin on the Client Access servers. All of the host (A) and alias (CNAME) records in the DNS zone are configured to have a TTL value of 10 minutes. You need to recommend a solution to fail over client connections to a Client Access server automatically if Internet Information Services (US) fails. The solution must minimize costs. What should you recommend?
Correct Answer: C
Explanation/Reference: Explanation: C: Hardware load balancers provide you service awareness, so you can actually get down to the individual, not only the individual TCP port, TCP 443 as an example, but you can potentially get down to the individual application as part of that service, depending on the load balancer you deploy. So now you can know if the web service, or the EWS service I should say, is failed - but OWA is still functioning on the CAS array. And you could take that member out of service as the result of that one failure because maybe you have. Lync deployed and you rely heavily on the EWS service. "Why not Windows Network Load Balancing? Well - there's several issues with it. References: