easyMultiple 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 access-list DENY-REMOTE
IPv6 access list DENY-REMOTE
deny ipv6 2001:DB8:2::/48 any sequence 10
permit ipv6 any any sequence 20Based on this output, what is the effect of this access list when applied to an interface?
⚠ Common exam trap
Cisco often tests the concept that an ACL with an explicit permit any any at the end overrides the implicit deny, so candidates mistakenly think the ACL only denies or only permits based on the first line, ignoring the sequence of entries.
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
✓
It denies all IPv6 traffic from 2001:DB8:2::/48 and permits everything else
The access list DENY-REMOTE explicitly denies IPv6 traffic sourced from the prefix 2001:DB8:2::/48 (sequence 10) and then permits all other IPv6 traffic (sequence 20). When applied to an interface, this results in only traffic from that specific prefix being blocked, while all other IPv6 traffic is allowed. This matches option B.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It permits all IPv6 traffic
Why it's wrong here
Traffic from the specified prefix is denied.
- ✓
It denies all IPv6 traffic from 2001:DB8:2::/48 and permits everything else
Why this is correct
Sequence 10 denies the prefix, sequence 20 permits all other traffic.
- ✗
It permits only IPv6 traffic from 2001:DB8:2::/48
Why it's wrong here
The ACL does the opposite – it denies that prefix.
- ✗
It denies all IPv6 traffic
Why it's wrong here
Only traffic from the specified prefix is denied; other traffic is permitted.
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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.