Because World Wide Web technologies are rapidly becoming the platform of choice for supporting enterprise-wide applications, the network infrastructure required to develop and host applications has grown in scale and complexity. One method that’s used to ensure a highly available network design is to incor-porate redundancy into the topology. Redundancy refers to the duplication of network components, paths, and services to provide fault tolerance and avoid any single points of failure in the network. A highly available network design must also take into consideration subnet addressing, the Dynamic Host Configuration Protocol (DHCP) server environment, and Domain Name System (DNS) hierarchy and naming. In this chapter you’ll learn how to incorporate redundancy into the network topology and how to deal with issues concerning subnetting, DHCP, and DNS.
To complete the lessons in this chapter, you must have