350-601 Network Practice Question
Exhibit
interface nve1 source-interface loopback0 member vni 10000 mcast-group 239.1.1.1 ! interface loopback0 ip address 10.10.10.1 255.255.255.255 ! interface Ethernet1/1 no switchport ip address 192.168.1.1 255.255.255.0 ip router ospf 1 area 0
Refer to the exhibit. An engineer configured a VXLAN tunnel endpoint (VTEP) but the VXLAN tunnel is not operational. The underlay OSPF adjacency is established. What is the missing configuration?
⚠ Common exam trap
Cisco often tests the distinction between underlay routing adjacency and reachability of the VTEP source IP, leading candidates to overlook the need to advertise the loopback in OSPF.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The loopback0 interface is not included in the OSPF process.
The loopback0 interface is not included in the OSPF process. For VXLAN underlay routing, the VTEP source interface (typically loopback0) must be advertised via the underlay IGP (OSPF) so that remote VTEPs can reach it. Without this, the NVE interface cannot form a VXLAN tunnel even though OSPF adjacency is established, as the source IP is unreachable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The NVE interface must be enabled with the no shutdown command.
Why it's wrong here
NVE interfaces are usually administratively up by default; no shutdown is not typically required.
- ✗
The multicast group must be reachable via the underlay.
Why it's wrong here
Multicast reachability affects BUM traffic but not the tunnel's operational status.
- ✓
The loopback0 interface is not included in the OSPF process.
Why this is correct
The loopback0 interface, used as the NVE source, is not advertised via OSPF, so its IP is unreachable from other VTEPs.
- ✗
The VNI must be mapped to a VLAN.
Why it's wrong here
VNI-to-VLAN mapping is needed for Layer 2 forwarding, but the immediate issue is the unreachable source interface.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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