<p>The following figure describes the correlation relationship between ELB and other could services.</p> <table border="1" cellpadding="0" cellspacing="0" style="width:0px"> <tbody> <tr> <td style="background-color:#ededed; width:194px"> <p><strong>Cloud service</strong></p> </td> <td style="background-color:#ededed; width:589px"> <p><strong>Description of correlation relationship</strong></p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>Elastic Compute Service (ECS)</p> </td> <td style="vertical-align:top; width:589px"> <p>The External ELB distributes the Internet traffic to multiple cloud servers in a balanced way to facilitate the External to have access to cloud resource of the VPC.</p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>Auto Scaling (AS)</p> </td> <td style="vertical-align:top; width:589px"> <p>The Auto Scaling policy can control the expansion and reduction of members in the ELB resource pool.</p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>Virtual Private Cloud (VPC)</p> </td> <td style="vertical-align:top; width:589px"> <p>1. VPC is the prerequisite for ELB creation.</p> <p>2. The VPC and the public network can be connected through the External ELB. The invocation between the internal systems of the VPC can be realized through the Internet ELB.</p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>Internet Gateway (IGW)</p> </td> <td style="vertical-align:top; width:589px"> <p>In East China region, you can use IGW with ELB to realize multiple cloud hosts providing services to the public internet.</p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>DDoS Protection</p> </td> <td style="vertical-align:top; width:589px"> <p>By default, the system provides 1G free basic protection for each External ELB service IP. You can also purchase DDoS protection with higher capability to prevent the ELB service from external attacks and improve its safety.</p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>Argus</p> </td> <td style="vertical-align:top; width:589px"> <p>You can view the status of the ELB service instance through the Argus service.</p> </td> </tr> <tr> <td style="vertical-align:top; width:194px"> <p>Log Cloud</p> </td> <td style="vertical-align:top; width:589px"> <p>ELB logs are stored on the log cloud.</p> </td> </tr> </tbody> </table>