You need to connect to a remote branch office via an Internet connection. The remote office does
not use Cisco equipment. This connection must be secure and must support OSPF.
Which of the following can be used to transport data to the branch office?
A.
GRE over IPsec
B.
IPsec
C.
GRE
D.
IPsec VTI
Shouldn’t the answer be D?
GRE = Cisco proprietary
IPSEC = No dynamic routing
Your thoughts?
Nope. “A” is the CORRECT answer. GRE was developed by CISCO, but it’s not CISCO proprietary. “B” and “C” separately do not provide security and OSPF. “D” – that’s CISCO proprietary technology.