The correct answer is that the next-hop-self command ensures the PE sets itself as the next-hop for routes advertised to the route reflector. This is required in MPLS L3VPN environments because the original next-hop for a customer prefix is often a remote CE router that is not directly connected across the MPLS core; by enabling next-hop-self under the VRF address-family, the PE advertises its own loopback or interface IP as the next-hop, guaranteeing that the route reflector and other PEs can reach that prefix through the MPLS backbone. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of BGP next-hop manipulation within a VRF context, a common scenario in service provider networks where route reflectors must receive reachable next-hops to avoid blackholing traffic. A frequent trap is assuming next-hop-self applies globally rather than per VRF, so remember that in a VRF address-family, the command only affects routes within that specific VRF. Memory tip: “Next-hop-self in VRF keeps the path local—your PE, your hop, your core.”
350-501 Services Practice Question
This 350-501 practice question tests your understanding of services. 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.
Exhibit
Refer to the exhibit.
! On PE router
router bgp 65000
neighbor 10.1.1.1 remote-as 65000
neighbor 10.1.1.1 update-source Loopback0
!
address-family vpnv4
neighbor 10.1.1.1 activate
neighbor 10.1.1.1 send-community extended
neighbor 10.1.1.1 next-hop-self
!
address-family ipv4 vrf CUST_A
redistribute ospf 1 vrf CUST_A
no synchronization
!
!
Refer to the exhibit. Which statement about this BGP configuration is true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The next-hop-self command ensures that the PE sets itself as the next-hop for routes advertised to the route reflector.
Option B is correct because the `next-hop-self` command under the VRF address-family instructs the PE router to set its own IP address as the next-hop for routes advertised to the route reflector. This is necessary in MPLS L3VPN environments to ensure that the route reflector (and other PEs) can reach the customer prefix via the advertising PE, avoiding reachability issues when the original next-hop is not directly connected across the MPLS core.
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.
✗
The no synchronization command is invalid under address-family ipv4 vrf.
Why it's wrong here
No synchronization is valid, though deprecated.
✓
The next-hop-self command ensures that the PE sets itself as the next-hop for routes advertised to the route reflector.
Why this is correct
Next-hop-self is used to set the local router as next-hop.
Related concept
Read the scenario before looking for a memorised answer.
✗
The send-community extended command is only needed for IPv4 unicast address family.
Why it's wrong here
Send-community is needed under VPNv4 for route-target.
✗
The redistribute ospf command will import OSPF routes into the VRF but not into BGP.
Why it's wrong here
Redistribute ospf under address-family ipv4 vrf imports OSPF routes into BGP for that VRF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that `next-hop-self` is only needed for eBGP peers, but in MPLS L3VPN it is essential for iBGP sessions to route reflectors to ensure correct next-hop reachability across the core.
Detailed technical explanation
How to think about this question
In MPLS L3VPN, the `next-hop-self` command is critical on PE routers because the original next-hop for a customer route learned via OSPF or static routing is often a CE router address that is not reachable across the MPLS core. By setting the next-hop to the PE's own loopback or interface address, the route reflector and other PEs can forward traffic to that PE via the MPLS LSP. Additionally, the `send-community extended` command under the VRF address-family ensures that route targets (RTs) are included in BGP updates, which is mandatory for proper VPN route import/export between VRFs.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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.
Services — This question tests Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The next-hop-self command ensures that the PE sets itself as the next-hop for routes advertised to the route reflector. — Option B is correct because the `next-hop-self` command under the VRF address-family instructs the PE router to set its own IP address as the next-hop for routes advertised to the route reflector. This is necessary in MPLS L3VPN environments to ensure that the route reflector (and other PEs) can reach the customer prefix via the advertising PE, avoiding reachability issues when the original next-hop is not directly connected across the MPLS core.
What should I do if I get this 350-501 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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