Which three key devices are in the SAFE SMR small network corporate Internet module? (Choose three)

A.
Servers

B.
VPN concentrators

C.
Layer 3 switches

D.
Firewalls

E.
Layer 2 switches

F.
NIDS

Explanation:
Key Devices
SMTP server
DNS server
FTP/HTTP server
Firewall or Firewall router
Layer 2 switch(with private VLAN support)
REF;Safe white papers;page11
SAFE: Extending the Security Blueprint to Small, Midsize, and Remote-User Networks