By providing encryption or authentication for the IP communication between two
routers, the communication between the two networks is protected. Performance can
also be improved by using the tunnel mode since it does not require each individual
network host to support the IPSec technology. On the other hand, by not providing
encryption or authentication within a network, the IP communication within the
network is not protected.
8.3.2 Transport Mode
e encryption or authentication run under the transport mode protects the IP com-
munication between two network hosts. Before the sender delivers data to the des-
tination, ...
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