300-410 Infrastructure Services Practice Question
A network engineer is configuring MPLS Traffic Engineering (TE) with RSVP-TE on a Cisco IOS XE router to provide bandwidth guarantees for delay-sensitive traffic. The engineer must ensure that the TE tunnel can signal the required bandwidth and that the path is computed based on available resources. Which two statements about the configuration are true? (Choose two.)
⚠ Common exam trap
The trap here is assuming that RSVP or TE commands are only needed on the headend, or confusing explicit paths with dynamic path computation.
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
✓
The tunnel mpls traffic-eng bandwidth command specifies the bandwidth to be reserved for the TE tunnel.
To configure MPLS TE with RSVP-TE, the tunnel interface must have the bandwidth reservation set with tunnel mpls traffic-eng bandwidth, and each physical interface along the path must have RSVP enabled with ip rsvp bandwidth. These two steps ensure that the tunnel can signal its bandwidth requirements and that network resources are reserved. Other statements misrepresent the requirements for transit routers, destination configuration, or path types.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The ip explicit-path command is used to define a dynamic path that can change based on network conditions.
Why it's wrong here
The ip explicit-path command defines a static, explicit path with a list of hops, not a dynamic path. Dynamic paths are configured using path options with the dynamic keyword. Explicit paths do not adapt to network changes, so this statement is false. The scenario requires resource-based path computation, which is better served by dynamic path options.
- ✓
The tunnel mpls traffic-eng bandwidth command specifies the bandwidth to be reserved for the TE tunnel.
Why this is correct
The tunnel mpls traffic-eng bandwidth command under the tunnel interface sets the bandwidth value that RSVP-TE signals along the path. This reservation ensures that the required resources are available on each link. Without it, the tunnel may not receive the necessary guarantees for delay-sensitive traffic, making it a critical configuration step.
- ✗
The mpls traffic-eng tunnels command is only needed on the tunnel headend and not on transit routers.
Why it's wrong here
The mpls traffic-eng tunnels command must be enabled globally on all routers that participate in TE, including transit routers, to allow them to process TE signaling and forward traffic. If it is missing on a transit router, the tunnel cannot be established through that router. This statement is therefore false.
- ✓
The ip rsvp bandwidth command must be configured on each physical interface along the TE path to enable RSVP reservations.
Why this is correct
Enabling RSVP on each interface along the path with the ip rsvp bandwidth command allows the router to reserve resources for TE tunnels. This command specifies the maximum reservable bandwidth and is required for RSVP-TE signaling to succeed. If omitted on any link, the tunnel setup fails because the interface cannot participate in the reservation.
- ✗
The tunnel destination command is optional if the path is explicitly specified with a dynamic path option.
Why it's wrong here
The tunnel destination command is always required for a TE tunnel, as it defines the endpoint of the tunnel. Even with a dynamic path option, the destination must be configured so that the headend knows where to signal the tunnel. Omitting it prevents tunnel establishment, making this statement incorrect.
Go deeper
Related to this question
Learn chapter
Device Management and Network Monitoring (SNMP, Syslog, NetFlow)
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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