mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 interface gigabitethernet 0/0
GigabitEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::1 Global unicast address(es): 2001:DB8:1:1::1, subnet is 2001:DB8:1:1::/64 Joined group address(es): FF02::1 FF02::2 ICMP redirects are enabled ICMP unreachables are enabled ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds ND advertised reachable time is 0 milliseconds ND advertised retransmit interval is 1000 milliseconds ND router advertisements are sent every 200 seconds ND router advertisements live for 1800 seconds Hosts use stateless autoconfig for addresses. IPv6 uRPF: strict mode (drop invalid packets)
Based on this output, what is the operational state of uRPF on this interface?
⚠ Common exam trap
Cisco often tests the ability to read the exact operational state from the 'show ipv6 interface' output, where candidates may overlook the explicit 'strict mode' line and instead assume uRPF is disabled or confuse it with loose mode based on incomplete knowledge of the command syntax.
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
✓
uRPF is enabled in strict mode
The output explicitly states 'IPv6 uRPF: strict mode (drop invalid packets)', which confirms that unicast Reverse Path Forwarding (uRPF) is enabled on the interface and operating in strict mode. In strict mode, the router verifies that the source address of an incoming packet matches a route in the FIB pointing back to the same interface; if not, the packet is dropped. This is a direct read of the operational state from the show command.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
uRPF is disabled
Why it's wrong here
The output explicitly shows uRPF is enabled.
- ✓
uRPF is enabled in strict mode
Why this is correct
The output confirms strict mode uRPF is active.
- ✗
uRPF is enabled in loose mode
Why it's wrong here
The output specifies strict mode, not loose.
- ✗
uRPF is enabled but only for multicast
Why it's wrong here
uRPF applies to unicast traffic, not specifically multicast.
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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.