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The detailed opportunities we describe in the following sections have variable horizon lines as well . The remainder of this section lists all of the equipment in the test environment . Other technologies discussed in the next section , will also play a critical role in the successful implementation of the server cluster design . These types of scenarios are described in the next section , along with recommendations . Secondly , and perhaps more importantly , to secure the switch against a Layer 2 MAC attack ( where multiple random MAC addresses are forwarded to the switch ) . But , by wrapping the service in the sort of rhetoric that inspired the Forbes article , the big companies who use the service have left themselves at risk in the future . Cisco Catalyst 6500 Series chassis can be deployed in the wiring closet , the distribution and core layers , the data center , and the WAN edge , providing the power and features required for end-to-end deployment for the enterprise campus , the ISP network , and metro and research computing networks . For the common sections of configuration , a user can execute a script that will automatically enter the appropriate configuration details such as SNMP contact information , RADIUS configuration , and Syslog configuration . Examples of features that serve the requirements for each of these groups are explored in further detail in the following section . Instead , the site uses small player advertising and promotion tactics to peddle the silly notion that members of the association can leverage their relationship to reduce costs with the big boys . Just 7 percent of job seekers visited three or more of the most popular career sites . The RP can use an ACL check to verify the validity of the source and accept or reject that multicast source from establishing itself as a Multicast source . The following section details some of the HA features that can be used to drive up network availability in the Data Center . Generally , there is a cluster of operations at the second tier . When a switch hears an IGMP join request from a host for a given multicast group , the switch adds the host 's port number to the group destination address list for that group . The Cisco Catalyst ® 3750G-16TD switch is a member of the Cisco Catalyst 3750 Series , an innovative product line that improves LAN operating efficiency by combining industry-leading ease of use and the highest resiliency available for stackable switches . The status LED on each module shows successful completion and minor and major failures of power-up diagnostics ; link-good LEDs show the status of any interface ; and switch-load LEDs show backplane usage .