mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Which IPv6 access-list entry will deny traffic…
Which IPv6 access-list entry will deny traffic from any source to the destination prefix 2001:db8:1::/48?
⚠ Common exam trap
Cisco often tests the order of source and destination in ACL entries, where candidates mistakenly reverse them (as in Option B) or use a host keyword instead of a prefix (as in Option C), thinking it matches a range.
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
✓
deny ipv6 any 2001:db8:1::/48
The IPv6 access-list entry 'deny ipv6 any 2001:db8:1::/48' uses the correct syntax: the source is 'any' (all traffic), and the destination is the prefix 2001:db8:1::/48, which matches all addresses within that /48 range. This entry denies traffic from any source to the entire destination prefix, as required by the question.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
deny ipv6 any 2001:db8:1::/48
Why this is correct
This correctly denies all IPv6 traffic from any source to the specified destination prefix.
- ✗
deny ipv6 2001:db8:1::/48 any
Why it's wrong here
This denies traffic from the specified source to any destination, which is the opposite of what is asked.
- ✗
deny ipv6 any host 2001:db8:1::1
Why it's wrong here
This denies traffic to a single host, not the /48 prefix.
- ✗
deny ipv6 2001:db8:1::/48 2001:db8:1::/48
Why it's wrong here
This denies traffic from the prefix to itself, which is not the intended behavior.
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Senior Network & Security Engineer · founder of Courseiva
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