300-415 Question #102: Real Exam Question with Answer & Explanation

The correct answer is B: vpn 0 interface ge0/1 ip address 172.16.13.3/24 ! ip route 0.0.0.0/0 172.16.13.1. To connect to the Internet, a WAN Edge router's transport interface IP address must reside in the same subnet as the gateway IP address specified in the default static route.

WAN Edge Router Deployment

Question

Refer to the exhibit. The tunnel interface configuration on both WAN Edge routers shown below:
Which configuration for WAN Edge routers will connect to the Internet?

Options

Avpn 0 interface ge0/1 ip address 172.16.15.5/24 ! ip route 0.0.0.0/0 172.16.13.1
Bvpn 0 interface ge0/1 ip address 172.16.13.3/24 ! ip route 0.0.0.0/0 172.16.13.1
Cvpn 0 interface ge0/1 ip address 172.16.13.3/24 ! ip route 0.0.0.0/0 172.16.8.1
Dvpn 0 interface ge0/1 ip address 172.16.15.5/24 ! ip route 0.0.0.0/0 172.16.8.1

Explanation

To connect to the Internet, a WAN Edge router's transport interface IP address must reside in the same subnet as the gateway IP address specified in the default static route.

Common mistakes.

A. The interface IP 172.16.15.5/24 and the default route's next-hop 172.16.13.1 are in different subnets, making the next-hop unreachable.
C. The interface IP 172.16.13.3/24 and the default route's next-hop 172.16.8.1 are in different subnets, making the next-hop unreachable.
D. The interface IP 172.16.15.5/24 and the default route's next-hop 172.16.8.1 are in different subnets, making the next-hop unreachable.

Concept tested. WAN Edge internet routing configuration

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-sdwan-basic-config.html

Topics

#WAN Edge Configuration#Internet Connectivity#Default Routing#Transport VPN

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