The TCP Layer
As indicated earlier, a generic application relies on either the TCP or UDP protocols for data transport. While many applications such as web server, web application servers, and database servers rely on the TCP protocol, some other applications such as DNS servers and WAP gateways rely on the UDP protocol. To track the health of the TCP layer of a host, and its effect on the status of any application server, the eG Enterprise uses a TCP test shown in Figure 1.
Figure 1 : The test mapped to the TCP layer of a Linux server
TCP , TCP traffic and Ephemeral Ports tests mapped to this layer have already been discussed in The TCP Layer
