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350-501 · Question #151
350-501 Question #151: Real Exam Question with Answer & Explanation
The correct answer is B: labels. When defining SR-TE explicit path hops for devices using IP unnumbered interfaces, engineers must use labels (Segment IDs) and the node address (typically a loopback IP) to specify the path segments.
MPLS and Segment Routing
Question
Which two features will be used when defining SR-TE explicit path hops if the devices are using IP unnumbered interfaces? (Choose two.)
Options
- Arouter ID
- Blabels
- Cnode address
- Dnext hop address
- Eoutput interface
Explanation
When defining SR-TE explicit path hops for devices using IP unnumbered interfaces, engineers must use labels (Segment IDs) and the node address (typically a loopback IP) to specify the path segments.
Common mistakes.
- A. A router ID identifies the router itself, but 'labels' and 'node address' are more specific to defining explicit hops in an SR-TE path, especially when interfaces are unnumbered.
- D. The next hop address is usually an interface's IP address. For IP unnumbered interfaces, their specific IP is not available for direct use as a hop identifier; instead, labels or the node's loopback address are used.
- E. Specifying an output interface directly is less granular and flexible than using Segment Routing labels and node addresses to define an explicit path, particularly with unnumbered interfaces where the interface IP itself is not unique.
Concept tested. SR-TE Explicit Path Hops with Unnumbered Interfaces
Topics
#Segment Routing TE#Explicit Path#IP Unnumbered#Segment Identifiers
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