The Useful but Short Life of an Ethernet Frame

The Useful but Short Life of an Ethernet Frame

After receiving the frame that Hannah sent, the first steps in R1's logic can be summarized as follows:

The FCS field in the Ethernet trailer is the field that lets an Ethernet NIC find out if the frame experienced errors. If the frame is error free, R1 removes the Ethernet header and trailer. In Figure 11-9, after R1 checks the FCS and finds out the frame has not had errors, R1 removes the Ethernet header and trailer. R1 is left with an IP packet, whose source IP address is 8.1.1.1 (Hannah), and whose destination is 130.4.3.3 (web server).