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300-410 Practice Question: The default keepalive interval for a GRE tunnel…
What is the default keepalive interval for a GRE tunnel interface on Cisco IOS-XE?
⚠ Common exam trap
Cisco often tests the default keepalive interval for GRE tunnels, and the trap here is that candidates confuse it with the default keepalive interval for other interface types (e.g., serial interfaces default to 10 seconds as well, but some assume 5 or 15 seconds based on unrelated protocols like EIGRP hello timers).
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
✓
10 seconds
The default keepalive interval for a GRE tunnel interface on Cisco IOS-XE is 10 seconds. This is defined by the default behavior of the `keepalive` command on tunnel interfaces, which sends periodic keepalive packets to verify the reachability of the tunnel destination. If no keepalive reply is received within three consecutive intervals (30 seconds by default), the tunnel interface is marked as down.
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 it's wrong here
5 seconds is not the default; it is configurable but not default.
- ✓
10 seconds
Why this is correct
The default keepalive interval is 10 seconds.
- ✗
15 seconds
Why it's wrong here
15 seconds is not the default for GRE tunnels.
- ✗
20 seconds
Why it's wrong here
20 seconds is not the default; it may be used for other tunnel types.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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