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كـورس CCNA 200-301
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Refer to the following output:
Router#show ip nhrp detail
10.1.1.2/8 via 10.2.1.2, Tunnel1 created 00:00:12, expire 01:59:47
Type: dynamic, Flags: authoritative unique nat registered used
NBMA address: 10.12.1.2
What does the authoritative flag mean in regards to the NHRP information?
It was obtained directly from the next-hop server.
Data packets are process switches for this mapping entry.
NHRP mapping is for networks that are local to this router.
The mapping entry was created in response to an NHRP registration request.
The NHRP mapping entry cannot be overwritten.
Which common issue causes intermittent DMVPN tunnel flaps?
. a routing neighbor reachability issue
a suboptimal routing table
interface bandwidth congestion
that the GRE tunnel to hub router is not encrypted
Which Cisco IOS VPN technology leverages IPsec, mGRE, dynamic routing protocol, NHRP, and Cisco Express Forwarding?
Cisco Easy VPN
A company has just opened two remote branch offices that need to be connected to the corporate network. Which interface configuration output can be applied to the corporate router to allow communication to the remote sites?
. interface Tunnel0 bandwidth 1536 ip address 126.96.36.199 255.255.255.224 tunnel source Serial0/0 tunnel mode gre multipoint
interface fa0/0 bandwidth 1536 ip address 188.8.131.52 255.255.255.224 tunnel mode gre multipoint
interface Tunnel0 bandwidth 1536 ip address 184.108.40.206 255.255.255.224 tunnel source 220.127.116.11 tunnel-mode dynamic
interface fa 0/0 bandwidth 1536 ip address 18.104.22.168 255.255.255.224 tunnel source 192.168.161.2 tunnel destination 22.214.171.124 tunnel-mode dynamic
Which Cisco VPN technology can use multipoint tunnel, resulting in a single GRE tunnel interface on the hub, to support multiple connections from multiple spoke devices?
Cisco Easy VPN
A network administrator is troubleshooting a DMVPN setup between the hub and the spoke. Which action should the administrator take before troubleshooting the IPsec configuration?
Verify the GRE tunnels
Verify crypto maps
Which protocol is used in a DMVPN network to map physical IP addresses to logical IP addresses?
A network engineer is troubleshooting a DMVPN setup between the hub and the spoke. The engineer executes the command “show crypto isakmp sa” and observes the output that is displayed. What is the problem?
That ISAKMP is not enabled
That ISAKMP is using default settings
An incompatible IP sec transform set
An incompatible ISAKMP policy
A network engineer wants to display the statistics of an active tunnel on a DMVPN network. Which command should the administrator execute to accomplish this task?
Router#show crypto ipsec sa
Router#show crypto isakmp peers
Router#show crypto isakmp sa
Router#show crypto ipsec transform-set
Router#show crypto engine connections active
Which two phases of DMVPN allow the spoke site to create dynamic tunnels to one other? (Choose two)
Which two commands configure on a DMVPN hub to enable phase 3? (Choose two)
ip nhrp interest
ip nhrp redirect
ip nhrp shortcut
ip network id
ip nhrp map
During which DMVPN phase is spoke-to-spoke communication enabled?
Which protocols support DMVPN?
Which two protocols are required for DMVPN? (Choose two)
. Open VPN
What is the NHRP role in DMVPN? (Choose two)
Obtains the next-hop to be used for routing
Routes the packet through the tunnel
Identifies the PIM-SM RP used to route the packet
Can authenticate VPN endpoints
It requires each tunnel endpoint to have an unique network ID
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