This 350-601 practice question tests your understanding of network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In an EVPN-VXLAN fabric, a network engineer notices that MAC addresses learned from an external router are not being advertised as EVPN type-2 routes. The external router is connected to a leaf switch via a Layer 3 port. Which additional configuration is needed on the leaf switch?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure `ip arp evpn` on the Layer 3 interface.
Option C is correct because when an external router is connected via a Layer 3 port, the leaf switch learns the router's MAC address through ARP, not through a VLAN. To advertise this MAC as an EVPN type-2 route, the `ip arp evpn` command must be configured on the Layer 3 interface. This command enables the switch to synchronize ARP entries into the EVPN BGP control plane, allowing MAC/IP advertisement for directly connected hosts on routed interfaces.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure `redistribute host-routes` under the BGP address-family l2vpn evpn.
Why it's wrong here
This redistributes IP host routes, not MAC/IP advertisement.
✗
Configure `evpn` under the VLAN interface associated with the external router's VLAN.
Why it's wrong here
This is for Layer 2 VNI, not for Layer 3 interfaces.
✓
Configure `ip arp evpn` on the Layer 3 interface.
Why this is correct
Allows the switch to advertise the neighbor's MAC and IP via EVPN.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure `routing-config` under BGP to enable both MAC-VRF and IP-VRF.
Why it's wrong here
No such command exists; the correct approach is per-interface.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between VLAN-based EVPN (where MACs are learned from the bridge domain) and routed interface EVPN (where MACs come from ARP), leading candidates to incorrectly choose VLAN-related options like `evpn` under the VLAN interface when the scenario involves a Layer 3 port.
Trap categories for this question
Command / output trap
No such command exists; the correct approach is per-interface.
Detailed technical explanation
How to think about this question
In EVPN-VXLAN fabrics, type-2 routes advertise MAC/IP pairs. For a host connected via a Layer 3 interface (routed port), the MAC address is learned via ARP and stored in the adjacency table. The `ip arp evpn` command triggers the switch to convert these ARP entries into EVPN type-2 routes, which are then advertised to other leaf switches. Without this command, the MAC is only known locally and never injected into the BGP EVPN control plane, causing remote endpoints to be unable to reach the external router's MAC.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure `ip arp evpn` on the Layer 3 interface. — Option C is correct because when an external router is connected via a Layer 3 port, the leaf switch learns the router's MAC address through ARP, not through a VLAN. To advertise this MAC as an EVPN type-2 route, the `ip arp evpn` command must be configured on the Layer 3 interface. This command enables the switch to synchronize ARP entries into the EVPN BGP control plane, allowing MAC/IP advertisement for directly connected hosts on routed interfaces.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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