Chapter 20

1: Name two issues arising from conventional IPSec configuration.
A1: Answer: IPSec does not allow routing protocol updates to be routed through the IPSec tunnel, because IPSec doesn't encrypt IP multicast/broadcast packets.

Each time a new network needs to be added to the list of IPSec participants, a new access list must be defined for user traffic encryption.

The hub router's configuration can become enormous.

Changing public IP hosts' addresses because of DHCP utilization by a service provider

Occasional requirement for a full-mesh configuration

2: What mechanism is used to accomplish DMVPN?
A2: Answer: mGRE/NHRP
3: How can you implement dynamic routing protocols over IPSec protected links?
A3: Answer: By using GRE tunnel interfaces ...

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