List two vital services performed by secondary DNS servers.
What will be an ideal response?
Secondary DNS servers:
• Ensure there is a copy of the primary DNS server's data, in case the primary server fails.
• Enable DNS load balancing (via the load sharing resource records) among a primary DNS server and its secondary servers. Load balancing means that if the DNS primary server is busy performing a name resolution, a different request for a name resolution that is received at the same time can be fielded by a secondary DNS server for faster response to users.
• Reduce congestion in one part of the network by spreading secondary servers to different geographic locations and to different Active Directory sites, yielding faster network response.
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