单选题It is considered a best practice to use the Dead Peer Detection (DPD) feature with which VPN topologies?（）AIPSecBIPSec with GRECDMVPNDEZVPNEall of the choices
单选题
It is considered a best practice to use the Dead Peer Detection (DPD) feature with which VPN topologies?（）
A
IPSec
B
IPSec with GRE
C
DMVPN
D
EZVPN
E
all of the choices
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