mediumMultiple Choice
300-410 Practice Question: Runs the following command to verify MPLS…
A network engineer runs the following command to verify MPLS forwarding:
R1# show mpls forwarding-table 192.168.1.0 255.255.255.0 detail
Output: Local Outgoing Prefix Bytes Label Outgoing Next Hop Label Label or Tunnel Id Switched interface 101 201 192.168.1.0/24 0 Gi0/0 10.0.0.2 MAC/Encaps: 14/18, MTU: 1500, Label Stack {201}
No output feature configured
What does this output indicate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Packets with label 101 will be swapped to label 201 and forwarded to 10.0.0.2
The output shows the MPLS forwarding table entry for prefix 192.168.1.0/24. The local label is 101, outgoing label is 201, next hop is 10.0.0.2 via GigabitEthernet0/0. The label stack contains only label 201.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Packets with label 101 will be swapped to label 201 and forwarded to 10.0.0.2
Why this is correct
The local label 101 maps to outgoing label 201, with next hop 10.0.0.2 out Gi0/0, confirming label swapping rather than PHP or pop. This satisfies the stem by matching the forwarding-table entry's Local Label, Outgoing Label and Next Hop fields exactly.
- ✗
Packets with label 101 will be popped and forwarded as IP packets
Why it's wrong here
The outgoing label is 201, not implicit-null, so R1 swaps label 101 for 201 and forwards the packet still labelled toward 10.0.0.2; PHP occurs only when the next hop advertises implicit-null. It tempts when the router is the egress LSR, where pop-and-route would apply.
- ✗
The prefix 192.168.1.0/24 is directly connected
Why it's wrong here
A directly connected prefix would show a Pop or Aggregate outgoing label with no next-hop router; here label 201 is swapped to next hop 10.0.0.2 via Gi0/0, indicating a remote prefix learned via LDP. It tempts because the /24 mask suggests a local subnet.
- ✗
The label stack has two labels
Why it's wrong here
The Label Stack {201} shows a single outgoing label; two labels would appear as {201, 202} or similar. It tempts because the table lists both a local label (101) and an outgoing label (201), but the local label is the inbound value assigned by this router, not part of the forwarded stack.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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Same concept, more angles
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Variation 1. A network engineer runs the following command on Router R1: R1# 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 Gi0/0 192.168.1.2 17 21 10.2.2.0/24 1500 Gi0/0 192.168.1.2 18 Untagged 10.3.3.0/24 0 Gi0/1 192.168.2.2 Based on this output, what is the problem with the label entry for 10.3.3.0/24?
hard- A.The label 18 is being swapped correctly.
- B.The prefix 10.3.3.0/24 is being forwarded with MPLS label 18.
- ✓ C.The next-hop router 192.168.2.2 is not an LDP neighbor for this prefix.
- D.The label 18 is being popped by the next-hop router.
Why C: The entry for 10.3.3.0/24 shows 'Untagged' in the Outgoing Label column, meaning Router R1 forwards packets for this prefix without an MPLS label. This occurs when the next-hop router (192.168.2.2) has not advertised a label for that prefix via LDP, so R1 has no outgoing label to impose. Therefore, the next-hop router is not an LDP neighbor for this prefix, which is the problem indicated by the output.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.