MAC spoofing in a switch LUT

durgaas title says it all. Thsi thread can be taken as a continuation of Goyal's thread "changing Physcial address of a computer"
Now consider this where you have a 4 port switch of which one port(say port no 4) is connected to a hub which supports 3 more systems.
switch A, HUB H
Switch LOOK UP table can be something like
MAC----PORT
A ------1
B ------2
C ------3
D ------4
D ------4 // this should have been E -----4 , E has spoofed D MAC ID
F-------4

now, if A has data for original D , how does it flow without being intercepted by E acting as D.
infact even without a hub or anyhting , just a normal switch lookups having a faulty entry, is there a possible solution to send datagrams securely?

In this instance, you may need to rely on the upper layers of TCP/IP for the required security.

ashIn this instance, you may need to rely on the upper layers of TCP/IP for the required security.

but since the mac has been spoofed , wont the arp itself be misled ?