d) load balancing
Load balancing can be implemented with hardware, software, or a combination of both. For load balancing Web traffic, there are several approaches. For Web serving, one approach is to route each request in turn to a different server host address in a domain name system (DNS) table, round-robin fashion. Usually, if two servers are used to balance a work load, a third server is needed to determine which server to assign the work to. Since load balancing requires multiple servers, it is usually combined with failover and backup services. In some approaches, the servers are distributed over different geographic locations.
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Preparing for .Net
Unless you've been living in a cave, you've probaby heard about Microsoft's much-hyped .Net initiative. If you are like most people, you're probably wondering what it all means. These resources should help.
LINKS: General Information
ADVICE: The emerging influence of .Net on Microsoft Certification
ADVICE: Preparing for the brave new world of .Net
ADVICE: Sample .Net code free