mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Consider this configuration on Router R5: ```…
Consider this configuration on Router R5: ```
interface Tunnel0
ipv6 address 2001:DB8:7::1/64 tunnel source 192.168.10.1 tunnel destination 192.168.20.2 tunnel mode ipv6ip tunnel ttl 64 ``` What is the effect?
⚠ Common exam trap
Cisco often tests the misconception that the tunnel source must be an interface name, or that the outer header's TTL is inherited from the inner packet, leading candidates to incorrectly eliminate the correct answer.
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 will work, and the TTL field in the outer IPv4 header will be set to 64.
The configuration creates an IPv6-over-IPv4 manual tunnel (tunnel mode ipv6ip). The tunnel source is specified as an IP address, which is valid; the router uses that address as the source of the outer IPv4 header. The 'tunnel ttl 64' command explicitly sets the Time-to-Live field in the outer IPv4 header to 64, overriding the default value.
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 tunnel will not work because the tunnel source is an IP address, not an interface.
Why it's wrong here
Using an IP address as tunnel source is allowed.
- ✓
The tunnel will work, and the TTL field in the outer IPv4 header will be set to 64.
Why this is correct
The 'tunnel ttl' command sets the TTL in the outer IPv4 header.
- ✗
The tunnel mode should be 'gre ip' for IPv6 over IPv4.
Why it's wrong here
ipv6ip is correct for IPv6 over IPv4 without GRE.
- ✗
The tunnel will use the IPv6 TTL for the outer header.
Why it's wrong here
The outer header uses IPv4 TTL, set by 'tunnel ttl'.
Go deeper
Related to this question
About these practice questions
One of 1,966 original 300-410 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.