You want to configure one-to-one static mapping of IP addresses using an address pool without using PAT on
an SRX Series device. Which source NAT option would you use?
A.
Interface-based source NAT
B.
Proxy ARP
C.
Address shifting
D.
Overflow pool
Answer: C
Here is explaination from JNCIS-SEC-P1 pdf doc, it would be Option 3 here:
Three Options for Source NAT and PAT
The Junos OS supports three methods to perform source NAT and PAT:
• Interface-based source NAT, which is the translation of the original source IP address to the egress interface’s
address always employing PAT;
• Standard pool-based NAT, which is a dynamic mapping of the original source address to an address from a
user-defined pool with or without PAT; and
• Source NAT with address shifting, which is a one-to-one mapping of the original source address to a user-defined
pool performed by shifting the IP addresses without PAT.