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?

A. interface Tunnel0 bandwidth 1536 ip address 209.165.200.230 255.255.255.224 tunnel source Serial0/0 tunnel mode gre multipoint

B. interface fa0/0 bandwidth 1536 ip address 209.165.200.230 255.255.255.224 tunnel mode gre multipoint

C. interface Tunnel0 bandwidth 1536 ip address 209.165.200.231 255.255.255.224 tunnel source 209.165.201.1 tunnel-mode dynamic

D. interface fa 0/0 bandwidth 1536 ip address 209.165.200.231 255.255.255.224 tunnel source 192.168.161.2 tunnel destination 209.165.201.1








 

Suggested Answer: A

The configuration of mGRE allows a tunnel to have multiple destinations. The configuration of mGRE on one side of a tunnel does not have any relation to the tunnel properties that might exist at the exit points. This means that an mGRE tunnel on the hub may connect to a p2p tunnel on the branch.
Conversely, a p2p GRE tunnel may connect to an mGRE tunnel. The distinguishing feature between an mGRE interface and a p2p GRE interface is the tunnel destination. An mGRE interface does not have a configured destination. Instead the GRE tunnel is configured with the command tunnel mode gre multipoint.
This command is used instead of the tunnel destination x.x.x.x found with p2p GRE tunnels. Besides allowing for multiple destinations, an mGRE tunnel requires
NHRP to resolve the tunnel endpoints. Note, tunnel interfaces by default are point-to-point (p-p) using GRE encapsulation, effectively they have the tunnel mode gre command, which is not seen in the configuration because it is the default.
The mGRE configuration is as follows:
!
interface Tunnel0 bandwidth 1536
ip address 10.62.1.10 255.255.255.0
tunnel source Serial0/0 tunnel mode gre multipoint Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/DMVPDG/DMVP
 N_2_Phase2.html

This question is in 300-101 Cisco Implementing Cisco IP Routing (ROUTE) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate




Disclaimers:
The website is not related to, affiliated with, endorsed or authorized by Cisco.
Trademarks, certification & product names are used for reference only and belong to Cisco.
The website does not contain actual questions and answers from Cisco's Certification Exam.