350-501 Architecture Practice Question
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 10.1.1.0/24 0 Gi0/0/0/0 point2point 17 18 10.2.2.0/24 0 Gi0/0/0/1 192.168.1.2 18 Untagged 10.3.3.0/24 0 Gi0/0/0/2 192.168.2.2
Based on the exhibit, which label operation will occur when a packet destined to 10.2.2.1 enters PE1 with label 17?
⚠ Common exam trap
Cisco often tests the distinction between label operations (push, swap, pop) in MPLS VPN scenarios, and the trap here is that candidates mistakenly think the incoming label is a VPN label that must be popped or pushed, rather than recognizing that the LFIB dictates a swap when the packet is transiting the MPLS core.
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
✓
Swap label 17 to label 18
The exhibit shows an MPLS VPN scenario where PE1 receives a labeled packet destined for 10.2.2.1. The incoming label 17 corresponds to the VPNv4 route for 10.2.2.1/32, and the LFIB on PE1 indicates a swap operation to label 18, which is the transport label used to forward the packet across the MPLS core toward the next-hop PE.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Forward with no label (Untagged)
Why it's wrong here
Untagged is for prefix 10.3.3.0/24.
- ✗
Pop the label and forward as IP
Why it's wrong here
Pop operation is for prefix 10.1.1.0/24, not 10.2.2.0/24.
- ✗
Push label 17 onto the packet
Why it's wrong here
Label 17 is the incoming label, not pushed.
- ✓
Swap label 17 to label 18
Why this is correct
The forwarding table shows outgoing label 18 for this prefix.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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