350-501 Architecture Practice Question
In an MPLS core, which forwarding mechanism do P routers use to forward packets for L3VPN?
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
✓
MPLS label switching
P routers (core routers) perform label switching based on the MPLS label stack. They do not need to examine the IP header; they swap labels and forward accordingly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MPLS label imposition
Why it's wrong here
Label imposition is done by PE routers.
- ✗
MPLS label disposition
Why it's wrong here
Label disposition is done by egress PE routers.
- ✗
IP routing based on destination IP
Why it's wrong here
P routers use MPLS labels, not IP routing, for VPN traffic.
- ✓
MPLS label switching
Why this is correct
Correct. P routers swap labels based on the LFIB.
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