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350-501 · topic practice

MPLS and Segment Routing practice questions

Practise Cisco SPCOR / CCNP Service Provider Core 350-501 MPLS and Segment Routing 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: MPLS and Segment Routing
Practice 10 questionsBrowse domain →

What the exam tests

What to know about MPLS and Segment Routing

Routing questions usually test route selection (administrative distance, metric), how static routes are configured and when they are preferred over dynamic routing.

Administrative distance comparing routing sources.

Static route configuration: next-hop vs exit interface.

Default route propagation and the gateway of last resort.

Recursive routing table lookups.

Watch out for

Common MPLS and Segment Routing exam traps

  • ▸Lower administrative distance wins when two routing sources have the same prefix.
  • ▸A static route with an exit interface creates a directly-connected dependency.
  • ▸The gateway of last resort is set by the default route, not automatically.
  • ▸Metric is only compared within the same routing protocol.

Practice set

MPLS and Segment Routing questions

20 questions · select your answer, then reveal the explanation

Question 1hardmultiple choice
Open the full BGP breakdown →

Refer to the exhibit. An engineer is configuring Segment Routing for BGP (BGP-SR) on a PE router to assign labels to prefixes learned from a CE. The route-policy SET-LABEL is applied to the neighbor under the address-family ipv4 unicast. However, the CE prefix 10.1.1.0/24 is not receiving the label. What is the most likely reason?

Exhibit

Refer to the exhibit.

router bgp 65000
 neighbor 10.0.0.1 remote-as 65001
 neighbor 10.0.0.1 update-source Loopback0
 !
 address-family vpnv4
  neighbor 10.0.0.1 activate
  neighbor 10.0.0.1 send-community extended
 exit-address-family
!
route-policy SET-LABEL
  if destination in (10.1.1.0/24) then
    set label-index 100
  endif
 end-policy
Question 2hardmulti select
Read the full MPLS explanation →

Which three features are unique to Segment Routing when compared to traditional MPLS with LDP? (Choose three)

Question 3hardmultiple choice
Open the full BGP breakdown →

A large service provider runs a dual-stack MPLS core with Segment Routing (SR-MPLS) and IS-IS as the IGP. The network has been operating stably for months. Recently, a new PE router (PE-5) was added and configured with IS-IS and SR. After the addition, some remote prefixes in the VRF on other PEs become unreachable. Troubleshooting reveals that the BGP next hop for those prefixes is the loopback of another PE (PE-3), but the MPLS forwarding table on PE-3 shows no label for the prefix. The IS-IS database on PE-3 shows the prefix-SID for PE-5's loopback, but the forwarding table does not have a label for that prefix. Commands like 'show mpls forwarding-table' show no entry for PE-5's loopback. What is the most likely cause and correct action?

Question 4hardmultiple choice
Review the full OSPF breakdown →

A service provider has deployed Segment Routing (SR-MPLS) with OSPF as the IGP. They enabled TI-LFA for link protection. During a maintenance window, they shut down a core link between two P routers. Expected behavior is that TI-LFA should provide sub-50ms failover. However, after the shutdown, traffic loss exceeds 10 seconds. Analysis shows that the backup path uses a segment list that includes a node SID from a router that is currently unreachable due to the same failure. The TI-LFA backup path calculation appears to have included a node that is dependent on the failed link. What design issue is most likely causing this?

Question 5hardmultiple choice
Read the full MPLS explanation →

In Segment Routing for MPLS (SR-MPLS), which TLV is used in IS-IS to advertise the Node SID?

Question 6easymultiple choice
Read the full MPLS explanation →

In Segment Routing (SR-MPLS), a label allocated from the Segment Routing Global Block (SRGB) for a specific router's loopback is known as what?

Question 7mediummultiple 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 8hardmultiple choice
Read the full MPLS explanation →

A service provider is designing a new MPLS core network using Segment Routing with MPLS data plane. They require traffic engineering capabilities to optimize bandwidth utilization. Which technology should be used to compute optimal paths based on IGP link attributes and bandwidth constraints?

Question 9easymultiple 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 10mediummultiple choice
Review the full OSPF breakdown →

During an MPLS network migration from LDP to Segment Routing, an engineer notices that some routers are not advertising Prefix-SIDs for certain loopbacks. The IGP is OSPF. What configuration is required on these routers to advertise Prefix-SIDs?

Question 11hardmultiple choice
Read the full MPLS explanation →

A service provider is deploying a new MPLS core with Segment Routing and requires fast convergence upon link failure. They plan to use TI-LFA (Topology Independent Loop-Free Alternate). What is a prerequisite for TI-LFA to provide protection against any single link failure?

Question 12mediummulti select
Read the full MPLS explanation →

Which TWO statements about MPLS label switching are correct? (Choose two.)

Question 13hardmulti select
Read the full MPLS explanation →

Which THREE of the following are benefits of using Segment Routing over LDP in an MPLS network? (Choose three.)

Question 14hardmultiple choice
Read the full MPLS explanation →

Refer to the exhibit. A PE router in an MPLS L3VPN network shows the above output. The VRF CUSTOMER contains two routes. Which statement about forwarding for these routes is true?

Exhibit

Refer to the exhibit.

PE1# show mpls forwarding-table
Local  Outgoing    Prefix            Labels Label    Next Hop
16     Pop         10.1.1.0/24        
       No Label    10.2.2.0/24        

PE1# show ip bgp vpnv4 vrf CUSTOMER
Network          Next Hop      Metric LocPrf Weight Path
Route Distinguisher: 100:1
10.1.1.0/24      192.168.1.1          0    100      0 65001 i
10.2.2.0/24      192.168.2.2          0    100      0 65002 i
Question 15mediummultiple choice
Read the full MPLS explanation →

Refer to the exhibit. An engineer configured Segment Routing on a router. However, the router does not advertise a Prefix-SID for the loopback0 interface. What is the most likely reason?

Exhibit

Refer to the exhibit.

interface GigabitEthernet0/0
 ip address 10.1.1.1 255.255.255.252
 mpls ip
 segment-routing mpls
!
router ospf 1
 segment-routing mpls
 prefix-sid index 100
 network 10.0.0.0 0.255.255.255 area 0
!
interface Loopback0
 ip address 192.168.1.1 255.255.255.255
 ip ospf 1 area 0
!
Question 16mediummultiple choice
Review the full OSPF breakdown →

A service provider is deploying MPLS L3VPN and notices that BGP next-hop resolution for VPNv4 routes fails on the PE routers. The PE routers are running OSPF as the IGP and have loopback interfaces used for LDP and BGP peering. Which configuration change should the engineer implement to ensure that the BGP next-hop is reachable?

Question 17easymultiple choice
Open the full BGP breakdown →

An engineer is designing an MPLS network and needs to ensure that VPN traffic between two PE routers is label-switched. The PE routers are connected via a P router and have a full mesh of iBGP sessions. Which label distribution method is required for the VPN labels?

Question 18hardmulti 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 19mediummultiple choice
Read the full MPLS explanation →

Refer to the exhibit. A network engineer notices that the local label 19 for prefix 10.4.4.0/24 shows 'Untagged' in the outgoing label column. What is the most likely cause?

Exhibit

Refer to the exhibit.

PE1# show mpls forwarding-table
Local  Outgoing    Prefix           Bytes Label   Outgoing   Next Hop
Label  Label       or Tunnel Id     Switched      interface
16     Pop Label   10.1.1.0/24      0             Gi0/0/0    192.168.1.1
17     18          10.2.2.0/24      0             Gi0/0/1    192.168.2.2
18     19          10.3.3.0/24      0             Gi0/0/1    192.168.2.2
19     Untagged    10.4.4.0/24      0             Gi0/0/2    192.168.3.3
Question 20mediummulti select
Read the full MPLS explanation →

Which TWO are benefits of using Segment Routing (SR) over traditional LDP-based MPLS?

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Frequently asked questions

What does the 350-501 exam test about MPLS and Segment Routing?
Routing questions usually test route selection (administrative distance, metric), how static routes are configured and when they are preferred over dynamic routing.
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 MPLS and Segment Routing questions in a focused session?
Yes — the session launcher on this page draws every question from the MPLS and Segment Routing 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.