Á La Mode
You need to determine how and where a Layer 7 content networking device will fit into your network infrastructure. That entails choosing both the "mode" in which the content networking device is deployed--proxy or transparent--and the network topology.
A proxy is an intermediary between two or more devices. When a content networking device is configured in proxy mode, all requests to a Web site or service go directly to it, and the device determines how to distribute the requests. When that same device is in transparent mode, it listens and only intercepts requests for the specific applications it's been configured to handle.
Proxy mode provides a single point of entry into your Web infrastructure, and it centralizes security and consolidates network logging. It has performance advantages over transparent mode in that it can keep open multiple TCP sessions to the servers. That way there's no latency from a second TCP handshake between the proxy device and each individual server in the farm.
Most load balancers and XML switches offer a proxy option. NetScaler's Request Switch 9000 Series devices, however, multiplex both HTTP and TCP in proxy mode, so they can process requests for content or services using HTTP 1.1 with existing TCP connections. That spreads HTTP requests across a number of connections.
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