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300-410 Practice Question: An engineer must configure a GRE tunnel to…
An engineer must configure a GRE tunnel to transport IPv6 traffic over an IPv4-only network. Which TWO configuration steps are required? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the distinction between GRE (tunnel mode gre ip) and IPv6-in-IPv4 manual tunneling (tunnel mode ipv6ip), where candidates mistakenly choose ipv6ip for IPv6 transport, forgetting that GRE is the standard for multiprotocol encapsulation and is required when the question explicitly mentions 'GRE tunnel'.
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
✓
Configure tunnel mode gre ip on the tunnel interface.
'tunnel mode gre ip' configures the tunnel interface to use Generic Routing Encapsulation (GRE) over IPv4, which is the standard method for encapsulating any Layer 3 protocol (including IPv6) inside IPv4 packets. This mode sets the tunnel to use IP protocol 47 (GRE) and allows the transport of IPv6 traffic across an IPv4-only network.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure tunnel mode gre ip on the tunnel interface.
Why this is correct
Correct. GRE is the default tunnel mode for IPv6 transport; explicit configuration ensures correct operation.
- ✓
Assign an IPv6 address to the tunnel interface.
Why this is correct
Correct. The tunnel interface must have an IPv6 address to enable IPv6 routing over the tunnel.
- ✗
Configure tunnel mode ipv6ip on the tunnel interface.
Why it's wrong here
Incorrect. tunnel mode ipv6ip is used for IPv6-in-IPv4 manual tunnels, not GRE. GRE uses tunnel mode gre ip.
- ✗
Set the tunnel destination to the remote IPv6 address.
Why it's wrong here
Incorrect. The tunnel destination must be the remote IPv4 address, not IPv6, because the tunnel transports IPv6 over IPv4.
- ✗
Place the tunnel interface in a VRF to separate IPv6 traffic.
Why it's wrong here
Incorrect. VRF is not required for basic GRE IPv6 transport; it is an optional feature for traffic isolation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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