Find Rock Hill South Carolina treasurer, tax collector, tax assessor, and property assessor. Treasurers and tax collectors provide information on property searches, tax bills, property liens, tax assessed values, and deductions. Rock Hill Treasurer & Tax Collector.
Because IPSec is integrated at the Internet layer (layer 3), it provides security for almost all protocols in the TCP/IP suite, and because IPSec is applied transparently to applications, there is no need to configure separate security for each application that uses TCP/IP.
Figure 1 illustrates how some of the major protocols would correlate to the OSI model in order to communicate via the Internet. In this model, there are four layers, including: 1  Ethernet (Physical/Data Link Layers). 2  IP/IPX (Network Layer).