Courseiva

350-501 · topic practice

Troubleshooting practice questions

Practise Cisco SPCOR / CCNP Service Provider Core 350-501 Troubleshooting practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security
20 questionsDomain: Troubleshooting
Practice 10 questionsBrowse domain →

What the exam tests

What to know about Troubleshooting

Troubleshooting questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common Troubleshooting exam traps

  • ▸Answering from memory before reading the full scenario.
  • ▸Missing a constraint such as cost, availability, security, scope or command context.
  • ▸Choosing a broad answer when the question asks for the most specific fix.
  • ▸Ignoring why the wrong options are tempting.

Practice set

Troubleshooting questions

20 questions · select your answer, then reveal the explanation

Question 1hardmultiple choice
Review the full OSPF breakdown →

A network engineer is troubleshooting OSPFv3 on a service provider's IPv6 network. The router shows that OSPFv3 adjacency never reaches FULL, says 'Init'. The neighbor is directly connected over a point-to-point link. What is the most likely cause?

Question 2hardmultiple choice
Read the full MPLS explanation →

Refer to the exhibit. An engineer is troubleshooting an MPLS LDP session between two routers. The output shows that the LDP session is operational. However, MPLS labels are not being exchanged. What is the most likely cause?

Exhibit

Router# show mpls ldp neighbor
    Peer LDP Ident: 10.1.1.2:0; Local LDP Ident: 10.1.1.1:0
        TCP connection: 10.1.1.2.646 - 10.1.1.1.52300
        State: Oper; Msgs sent/rcvd: 100/101; Downstream on demand
        Up time: 01:23:45
        LDP discovery sources:
            GigabitEthernet0/0/0; xc: 10.1.1.2:0
        Addresses bound to peer LDP Ident:
            10.2.2.2        10.3.3.3
Question 3hardmultiple choice
Open the full BGP breakdown →

A service provider is troubleshooting BGP route advertisement for a VPNv4 prefix. The PE router receives the prefix from the route reflector but does not install it in the VRF routing table. The BGP table shows the prefix as valid but not best. What is the most likely cause?

Question 4mediummultiple choice
Study the full QoS explanation →

An engineer is troubleshooting a QoS policy on a Cisco router. The policy is intended to mark voice traffic with DSCP EF and video traffic with DSCP AF41. After applying the policy, voice traffic is correctly marked, but video traffic is marked as DSCP 0. What is the most likely cause?

Question 5mediummultiple choice
Open the full BGP breakdown →

An engineer is troubleshooting a BGP route propagation issue. The customer is receiving a default route from upstream provider, but the route is not being installed in the routing table. The BGP table shows the route is valid but not best. What is the most likely cause?

Question 6mediummultiple choice
Open the full BGP breakdown →

An engineer is troubleshooting a BGP peering issue between two routers. The peering is established, but routes are not being exchanged. On router R1, 'show bgp neighbors 192.0.2.2' shows the neighbor state as 'Established' but the 'Prefixes received' counter is zero. What is most likely the cause?

Question 7mediummulti select
Open the full BGP breakdown →

A network engineer is troubleshooting a BGP route selection issue on a router that receives the same prefix from two different peers. Which THREE BGP attributes are considered in the route selection process before the 'prefer the route with the lowest metric' step?

Question 8easymultiple choice
Read the full MPLS explanation →

An engineer is deploying MPLS in the core and wants to ensure that all core routers use the same label for a specific prefix, regardless of which router originated it. Which MPLS label allocation mode should be used?

Question 9mediummultiple choice
Review the full OSPF breakdown →

An engineer is troubleshooting an MPLS L3VPN where customers behind CE1 cannot reach a specific prefix behind CE2. The PE routers are using OSPF as the IGP and LDP for label distribution. On PE2, the prefix is present in the VRF routing table, but not in the VRF forwarding table. What is the most likely cause?

Question 10hardmulti select
Read the full MPLS explanation →

A network engineer is troubleshooting an LDP session failure between two directly connected routers. The routers are configured with the 'mpls ldp' command under the interface. The 'show mpls ldp neighbor' command shows no neighbors. Which two additional pieces of information should the engineer verify? (Choose two.)

Question 11easymultiple choice
Read the full MPLS explanation →

A network engineer is troubleshooting an MPLS TE tunnel that is not coming up. The tunnel is configured with a strict explicit path, and the path includes an interface that is currently down. Which action should the engineer take to allow the tunnel to use an alternative path?

Question 12mediummultiple choice
Read the full MPLS explanation →

Refer to the exhibit. A network engineer is troubleshooting MPLS forwarding for prefix 10.10.10.0/24. The router shows two entries. What does the 'Pop tag' in the outgoing tag indicate?

Exhibit

Router# show mpls forwarding-table 10.10.10.0/24
Local tag  Outgoing tag  Prefix         Outgoing interface  Bytes tag switched
16           Pop tag       10.10.10.0/24   GigabitEthernet0/0/0/0  345678
17           Untagged     10.10.10.0/24   GigabitEthernet0/0/0/1  123456
Question 13mediummultiple choice
Read the full MPLS explanation →

A network engineer is troubleshooting MPLS L3VPN issues on a PE router. The CE router is receiving routes from the PE, but the CE cannot ping the remote CE. The PE shows the remote prefix in its routing table and in the VRF. What is the most likely cause?

Question 14mediummultiple choice
Read the full MPLS explanation →

An engineer is troubleshooting MPLS label switching in a service provider core. They notice that packets are being forwarded correctly between provider edge routers, but when they check the MPLS forwarding table on a P router, they see only implicit-null labels for some destinations. What is the most likely reason for this?

Question 15hardmultiple choice
Read the full MPLS explanation →

An engineer is troubleshooting MPLS LSP connectivity. The ingress PE router has the label binding for the FEC 10.1.1.0/24, but no LSP is established. Which command should be checked on the P routers to verify the LSP path?

Question 16hardmultiple choice
Open the full BGP breakdown →

An engineer is troubleshooting a BGP route reflector setup. Clients are not receiving all routes. The 'show bgp neighbors' output shows a state of 'Active'. What is the most likely cause?

Question 17mediummulti select
Read the full MPLS explanation →

An ISP is designing a new core network using MPLS-TE. They require very fast failure detection for link and node failures to minimize traffic loss. Which two technologies should they combine? (Choose two.)

Question 18mediummultiple choice
Open the full BGP breakdown →

A service provider is troubleshooting BGP route selection between two eBGP peers. The router receives a prefix from Peer A with local preference 150 and AS path length 3. From Peer B, the same prefix has local preference 100 and AS path length 2. Which route will be preferred?

Question 19hardmultiple choice
Study the full multicast explanation →

During multicast troubleshooting, the command 'show ip mroute' shows that the RPF neighbor for a particular (S,G) entry is incorrect. What is the most likely cause?

Question 20easymultiple choice
Read the full MPLS explanation →

An engineer is troubleshooting MPLS forwarding. On a router, the 'show mpls forwarding-table' command displays that for a specific FEC, the outgoing label is 'Untagged'. What does this indicate?

Continue with 20-question session →

Free account

Track your progress over time

Create a free account to save your results and see which topics improve across sessions.

Sign up freeLog in

Focused Troubleshooting sessions

Start a Troubleshooting only practice session

Every question in these sessions is drawn from the Troubleshooting domain — nothing else.

10 questions20 questions30 questions50 questions
Browse all Troubleshooting questions →Mixed 350-501 session

Related practice questions

Related 350-501 topic practice pages

Move into related areas when this topic feels solid.

Architecture practice questions

Practise 350-501 questions linked to Architecture.

Networking practice questions

Practise 350-501 questions linked to Networking.

MPLS and Segment Routing practice questions

Practise 350-501 questions linked to MPLS and Segment Routing.

Automation and Quality of Service practice questions

Practise 350-501 questions linked to Automation and Quality of Service.

Services practice questions

Practise 350-501 questions linked to Services.

Automation and Assurance practice questions

Practise 350-501 questions linked to Automation and Assurance.

350-501 fundamentals practice questions

Practise 350-501 questions linked to 350-501 fundamentals.

350-501 scenario practice questions

Practise 350-501 questions linked to 350-501 scenario.

350-501 troubleshooting practice questions

Practise 350-501 questions linked to 350-501 troubleshooting.

Frequently asked questions

What does the 350-501 exam test about Troubleshooting?
Troubleshooting questions test whether you can apply the concept in context, not just recognise a definition.
How should I use these practice questions?
Select your answer before revealing the explanation. Then read why each option is right or wrong — this active recall approach builds retention far faster than re-reading notes.
Can I practise just Troubleshooting questions in a focused session?
Yes — the session launcher on this page draws every question from the Troubleshooting domain. Use a 10-question session first to gauge your baseline, then move to 20 or 30 once the weak spots are clear.
Where can I practise other 350-501 topics?
Use the topic links above to move to related areas, or go back to the 350-501 question bank to see all topics.
Are these real exam questions or dumps?
These are original practice questions written to test the same concepts the 350-501 exam covers. They are not copied from any real exam or dump site.