| Interface | Description | 
|---|---|
| DNSToSwitchMapping | 
 An interface that must be implemented to allow pluggable DNS-name/IP-address to RackID resolvers. 
 | 
| Class | Description | 
|---|---|
| AbstractDNSToSwitchMapping | 
 This is a base class for DNS to Switch mappings. 
 | 
| DefaultRackDNSToSwitchMapping | 
 This class implements the  
DNSToSwitchMapping interface It returns the DEFAULT_RACK for every host. | 
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