hardMultiple Choice
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) Inbound access list: FILTER-IPv6
Based on this output, which two features are configured on this interface?
⚠ Common exam trap
Cisco often tests the distinction between strict and loose uRPF modes, and the trap here is that candidates may overlook the 'Inbound access list' line and assume the ACL is outbound, or confuse the uRPF mode with the ACL direction.
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 in strict mode and inbound IPv6 ACL
The output shows 'IPv6 uRPF: strict mode (drop invalid packets)' and 'Inbound access list: FILTER-IPv6', confirming that unicast Reverse Path Forwarding in strict mode and an inbound IPv6 ACL are both configured on the interface. Strict uRPF verifies that the source address of incoming packets has a matching route in the FIB pointing back to the same interface, dropping packets that fail this check. The inbound ACL filters traffic before any routing decision, as indicated by the 'Inbound access list' line.
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 in strict mode and inbound IPv6 ACL
Why this is correct
The output explicitly lists "IPv6 uRPF: strict mode (drop invalid packets)" and "Inbound access list: FILTER-IPv6", confirming both features are active on GigabitEthernet0/0. These two lines directly satisfy the question's requirement to identify the configured features.
- ✗
uRPF in loose mode and outbound IPv6 ACL
Why it's wrong here
The output states "IPv6 uRPF: strict mode", not loose mode, and the ACL is inbound. Loose mode, which validates only reachability of the source rather than the incoming interface, would be chosen for asymmetric routing; here strict mode is configured.
- ✗
uRPF disabled and inbound IPv6 ACL
Why it's wrong here
The output explicitly shows "IPv6 uRPF: strict mode (drop invalid packets)", so uRPF is enabled, not disabled. The inbound ACL reading is correct, but uRPF disabled would appear only if the feature were absent from the output.
- ✗
uRPF in strict mode and outbound IPv6 ACL
Why it's wrong here
The output lists the access list under "Inbound access list", so the ACL is applied inbound, not outbound. uRPF strict mode is correctly read, but the ACL direction is wrong; an outbound ACL would appear as "Outgoing access list".
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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.