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4.1 Explain the purpose and features of various network appliances.
- Load balancer
A load balancer is a core networking solution responsible for distributing incoming traffic among servers hosting the same application content. By balancing application requests across multiple servers, a load balancer prevents any application server from becoming a single point of failure, thus improving overall application availability and responsiveness. Load balancers are capable of making traffic decisions and typically incorporate network address translation (NAT). Load balancers also monitor the availability of application servers to avoid sending client requests to a server resource that is unable to respond.
Load Balancer
Load Balancing
- Proxy server
A proxy server is a server that acts as an intermediary to allow clients to make indirect network connections to other network services. A client connects to the proxy server and requests a connection, file, or other resource available on a different server. The proxy provides the resource either by connecting to the specified server or by serving it from a cache. Web proxies can also filter the content of Web pages served.
- Content filter
- VPN concentrator
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