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Which of the following cannot be exchanged between spoke sites in a DMVPN design? (Select 2 choices.)

Which of the following cannot be exchanged between spoke sites in a DMVPN design? (Select 2 choices.)

A. unicast traffic

B. multicast traffic

C. VoIP traffic

D. dynamic routing traffic

Explanation:

Multicast traffic and dynamic routing traffic cannot be exchanged between spoke sites in a Dynamic Multipoint virtual private network (DMVPN) design. Multicast traffic and dynamic routing traffic must be sent from spoke to hub.

DMVPN enables an administrator to easily configure scalable IP Security (IPSec) virtual private networks(VPNs) using a hubandspoke design. The hub router or routers are typically assigned a static IP address? the spoke routers can be dynamically addressed. DMVPN requires Generic Routing Encapsulation (GRE), Next Hop Resolution Protocol (NHRP), and a dynamicrouting protocol such as Enhanced Interior Gateway Routing Protocol (EIGRP) or Open Shortest Path First (OSPF). A multipoint GRE (mGRE) tunnel is used to carry multiple IPSec or GRE tunnels. NHRP is used to create a database of tunnel addresstoreal address mappings.
Unicast traffic and Voice over IP (VoIP) traffic can be exchanged between spoke sites. However, only limited Quality of Service (QoS) mechanisms can be provided between spokes, thereby preventing VoIP and video traffic from being properly prioritized.

Reference:
Cisco: Multicast over IPSec VPN Design Guide: Overview
Cisco: Dynamic Multipoint VPN (DMVPN) Design Guide (Version 1.1): Known Limitations Summary for SpoketoSpoke Deployment Model (PDF)


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