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Scenario-based practice

Troubleshooting Scenario Questions

Practise Cisco SPCOR / CCNP Service Provider Core 350-501 practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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15
scenario questions
350-501
exam code
Cisco
vendor

Scenario guide

How to approach troubleshooting scenario questions

These questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure.

Quick answer

Troubleshooting Scenario Questions 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.

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Practice set

Practice scenarios

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 8mediummultiple 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 9hardmulti 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 10easymultiple 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 11mediummultiple 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 12easymulti select
Read the full MPLS explanation →

Which two MPLS OAM tools can be used to troubleshoot label switching paths? (Choose two)

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 VRF explanation →

The CE router behind the VRF interface is unable to reach the remote CE. Which configuration error is most likely the cause?

Exhibit

Refer to the exhibit. The configuration snippet is from a PE router in an MPLS L3VPN setup.

ip vrf CUSTOMER
 rd 100:1
 route-target export 100:1
 route-target import 100:1
!
interface GigabitEthernet0/0
 ip vrf forwarding CUSTOMER
 ip address 192.168.1.1 255.255.255.252
!
interface GigabitEthernet0/1
 ip address 10.0.0.1 255.255.255.252
 mpls ip
!
router bgp 100
 bgp log-neighbor-changes
 neighbor 10.0.0.2 remote-as 100
 neighbor 10.0.0.2 update-source Loopback0
 !
 address-family vpnv4
  neighbor 10.0.0.2 activate
  neighbor 10.0.0.2 send-community extended
 !
 address-family ipv4 vrf CUSTOMER
  redistribute connected
 !
Question 15mediummultiple 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?

These 350-501 practice questions are part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style 350-501 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.