Which type of NAT would you configure if a host on the external network required access to an
internal host?

A.
Outside global NAT

B.
NAT overload

C.
Dynamic outside NAT

D.
Static NAT

Explanation:
http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_static.html
Information About Static NAT
Static NAT creates a fixed translation of real address(es) to mapped address(es).With dynamic
NAT and PAT, each host uses a different address or port for each subsequent translation.
Because the mapped address is the same for each consecutive connection with static NAT, and a
persistent translation rule exists, static NAT allows hosts on the destination network to initiate
traffic to a translated host (if an access list exists that allows it).
The main difference between dynamic NAT and a range of addresses for static NAT is that static
NAT allows a remote host to initiate a connection to a translated host (if an access list exists that
allows it), while dynamic NAT does not. You also need an equal number of mapped addresses as
real addresses with static NAT.
Figure 28-1 shows a typical static NAT scenario. The translation is always active so both
translated and remote hosts can originate connections, and the mapped address is statically
assigned by the static command.
Figure 28-1 Static NAT