300-410 Infrastructure Services Practice Question
A service provider is deploying MPLS Traffic Engineering (TE) with RSVP-TE to ensure bandwidth guarantees for critical traffic. The network engineer has configured an MPLS TE tunnel on a Cisco IOS XE router. The tunnel must be able to signal an explicit path that includes a specific link with a reserved bandwidth of 50 Mbps. Which RSVP-TE object is used to carry the explicit route information in the Path message?
⚠ Common exam trap
A common mix-up: candidates confuse the LABEL_REQUEST object, which requests labels, with the EXPLICIT_ROUTE object, which actually carries the explicit path information in the Path message.
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
✓
EXPLICIT_ROUTE object
In RSVP-TE, the EXPLICIT_ROUTE object (ERO) is used to specify the explicit path for a TE tunnel. It is included in the Path message and contains the list of hops that the tunnel must traverse. The SESSION object identifies the session, the RSVP_HOP object provides previous hop information, and the LABEL_REQUEST object requests label bindings. Only the EXPLICIT_ROUTE object carries the explicit route information needed to signal a path that includes a specific link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
LABEL_REQUEST object
Why it's wrong here
The LABEL_REQUEST object is used in RSVP-TE Path messages to request a label binding from downstream nodes for the TE tunnel. It indicates the desired label range and is essential for establishing the label switched path, but it does not carry explicit route information. Therefore, it does not meet the requirement.
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RSVP_HOP object
Why it's wrong here
The RSVP_HOP object carries the IP address of the previous hop node and the logical interface handle. It is used for routing RSVP messages and does not contain explicit route information. It is not the object that specifies the path a TE tunnel should take.
- ✗
SESSION object
Why it's wrong here
The SESSION object in RSVP-TE identifies the session for which resources are being reserved. It contains the destination IP address, tunnel ID, and extended tunnel ID. It does not carry explicit route information. The explicit route is carried in a different object, so this is not the correct answer.
- ✓
EXPLICIT_ROUTE object
Why this is correct
The EXPLICIT_ROUTE object (ERO) is used in RSVP-TE Path messages to specify the explicit path that the TE tunnel should take. It contains a list of hops (usually IP addresses or autonomous system numbers) that the tunnel must traverse. In this scenario, the engineer needs to include a specific link in the path, and the ERO is the correct object to carry that information.
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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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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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