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300-410 Practice Question: The default hello interval for the Label…
What is the default hello interval for the Label Distribution Protocol (LDP) on a Cisco IOS-XE router?
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
✓
5 seconds
LDP hello messages are sent every 5 seconds by default on Cisco IOS-XE routers to discover and maintain adjacencies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
5 seconds
Why this is correct
LDP sends hello messages every 5 seconds by default on Cisco IOS-XE, with a 15-second hold time. This interval maintains session adjacency detection, so neighbours are declared down after three missed hellos rather than waiting longer.
- ✗
10 seconds
Why it's wrong here
LDP's default hello interval on IOS-XE is 5 seconds, so 10 seconds is wrong. It tempts because 10 seconds is the default for other protocols' timers, such as OSPF's hello on broadcast networks, but LDP uses 5.
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15 seconds
Why it's wrong here
LDP's default hello interval on IOS-XE is 5 seconds, so 15 seconds misstates the timer value. The figure is tempting because 15 seconds is the default hello interval for OSPF on broadcast and point-to-point interfaces, making it the right answer only when the question concerns OSPF rather than LDP.
- ✗
3 seconds
Why it's wrong here
LDP's default hello interval on IOS-XE is 5 seconds; 3 seconds matches neither the default nor a typical configured value. It tempts as a plausible low value for fast failure detection, which is what the interval controls, but the actual default is 5.
Go deeper
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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.
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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