Q1

Layer 3 virtual private network (VPN) solutions based on MPLS are characterized by:

• A) Good level of automation and integration between the public backbone and private networks.
• B) Particularly high levels of security thanks to the use of cryptographic techniques.
• C) Layer 3 tunneling mechanisms, i.e. inside IP packets.
• D) Customer-managed overlay of IPsec/GRE tunnels with no provider participation.
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