Explanation

Gateway (Correct): The SG100 and SG1000 'Services Appliances' are designed to operate as Gateway Nodes.5 The Gateway Node provides the load-balancing interface (S3/Swift endpoints) for client applications.6

Admin (Correct): These appliances can also operate as Admin Nodes (primary or non-primary) to provide grid management services.7 The SG100 is unique because it combines the computing power to run both Gateway and Admin node services on a single hardware chassis, removing the need for separate virtual machines for these roles.8

Storage: The SG100 is a services appliance and contains no object storage capacity. Storage nodes are provided by different appliances (e.g., SG5700, SG6000).

Load balancer: While the appliance provides load balancing services, 'Load balancer' is considered a service or function running inside the Gateway/Admin node, not a distinct 'Node Type' in the StorageGRID topology definitions.9