1. Which NHRP message type is sent by a DMVPN spoke to inform the DMVPN hub of NBMA information?
- registration
- resolution
- redirect
- purge
2. What is a feature of DMVPN Phase 1?
- support for VPN tunnels only between spoke and hub sites
- support for spoke-to-spoke communication on a dynamic basis
- support for spoke-to-spoke communication between DMVPN networks
- support for next-hop preservation
3. What are two common problems to avoid when configuring tunnel or overlay networks? (Choose two.)
- recursive routing
- outbound interface selection
- routing loops
- inbound interface selection
- split horizon
4. Which DMVPN tunnel state is established first?
- INTF
- IKE
- IPsec
- NHRP
- UP
5. Which GRE tunnel configuration step is optional?
- setting the MTU
- defining the tunnel destination
- allocating an IP address to the tunnel interface
- defining the tunnel source
6. Which NHRP message type is used to locate and provide the tunnel and NBMA IP addresses of the remote spoke?
- resolution
- registration
- redirect
- purge
7. What type of encapsulation is used by DMVPN?
- Multipoint GRE (mGRE)
- Frame Relay
- 802.1Q
- PPP
8. What is the first step for configuring DMVPN on a hub router?
- Create the tunnel interface.
- Define the tunnel key.
- Enable NHRP redirect.
- Define the MTU for the tunnel.
9. What is the recommended holdtime for valid NHRP mapping entries in the NHRP cache?
- 30 seconds
- 600 seconds
- 7200 seconds
- 65,535 seconds
10. Which NHRP message extension contains a list of the next-hop servers that NHRP request packets have traversed?
- forward transit NHS record
- reverse transit NHS record
- responder address
- authentication
11. A network administrator notices that a DMVPN tunnel is not fully established and has not moved beyond the NHRP tunnel state. What is indicated by the NHRP state?
- The DMVPN spoke router has not registered.
- The line protocol of the DMVPN tunnel is down.
- IPsec tunnels have not established IKE sessions.
- IPsec security associations are not established.
12. For configuring IPv6 DMVPN, which IP version is supported as the transport and tunnel protocol?
- Only IPv4 is supported as the transport protocol.
- Only IPv6 is supported as the tunnel protocol.
- Only IPv4 is supported as the tunnel protocol.
- Both IPv4 and IPV6 are supported as either the tunnel protocol or the transport protocol.
“Do I Know This Already?” Quiz Answers:
1. Which of the following protocols do Generic Routing Encapsulation (GRE) tunnels support? (Choose all that apply.)
- DECnet
- Systems Network Architecture (SNA)
- IPv4
- IPv6
- MPLS
2. True or false: NHRP is a Cisco-proprietary protocol developed for DMVPN.
- True
- False
3. Which DMVPN phase does not work well with route summarization of spoke prefixes?
- DMVPN Phase 1
- DMVPN Phase 2
- DMVPN Phase 3
- DMVPN Phase 4
4. Which DMVPN phase introduced hierarchical tunnel structures?
- DMVPN Phase 1
- DMVPN Phase 2
- DMVPN Phase 3
- DMVPN Phase 4
5. True or false: DMVPN supports multicast.
- True
- False
6. What is the configuration difference between DMVPN Phase 1 and DMVPN Phase 2 on the hub router?
- The use of the command ip nhrp shortcut
- The use of the command ip nhrp redirect
- The use of the command ip nhrp version 2
- There is no difference in configuration.
7. What is the configuration difference between DMVPN Phase 2 and DMVPN Phase 3 on the spoke router?
- The use of the command ip nhrp shortcut
- The use of the command ip nhrp redirect
- The use of the command ip nhrp version 3
- There is no difference in configuration.
8. True or false: After a spoke router registers with the hub router, the hub router sends communication to the spoke router to establish a full mesh of tunnels with other spoke routers.
- True
- False
9. What does the syslog message “Midchain parent maintenance for IP midchain out” indicate?
- There is a problem with the PKI certificate infrastructure.
- There is a recursive routing loop on the tunnel.
- The remote peer has placed its tunnel in maintenance mode.
- The encapsulating interface has been shut down.
10. How long is the default NHRP cache timer?
- 2 hours
- 1 hour
- 30 minutes
- 15 minutes
11. Which of the following issues do network engineers commonly overlook when using IPv6 DMVPN tunnels?
- Changing the MTU on the tunnel interface to accommodate the larger packet header
- Configuring a link-local IP address on the tunnel interface
- Placing the tunnel into IPv6 GRE multipoint mode
- Configuring the NBMA address in CIDR notation (for example, 2001:12:14::1/64)