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300-410 Practice Question: Consider this configuration on router R2: ```…

Consider this configuration on router R2: ```

interface GigabitEthernet0/0
 ip access-group RESTRICT_ACCESS in

!

ip access-list extended RESTRICT_ACCESS
 permit ip 10.0.0.0 0.255.255.255 any
 deny   ip any any

``` What traffic will be permitted inbound on GigabitEthernet0/0?

⚠ Common exam trap

Cisco often tests the distinction between prefix length and wildcard mask, leading candidates to misinterpret 0.255.255.255 as a /24 or /16 mask instead of the correct /8 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

✓

All traffic from the 10.0.0.0/8 network.

The access list RESTRICT_ACCESS uses a wildcard mask of 0.255.255.255, which matches the first octet exactly and ignores the remaining three octets. This effectively permits all traffic from the 10.0.0.0/8 network (10.0.0.0 through 10.255.255.255). The explicit deny ip any any at the end blocks all other traffic, so only traffic sourced from the 10.0.0.0/8 range is permitted inbound on GigabitEthernet0/0.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Only traffic from source 10.0.0.0/24.

    Why it's wrong here

    Incorrect. The wildcard mask 0.255.255.255 matches all addresses starting with 10, not just 10.0.0.0/24.

  • ✓

    All traffic from the 10.0.0.0/8 network.

    Why this is correct

    Correct. The wildcard mask 0.255.255.255 matches the 10.0.0.0/8 range.

  • ✗

    All traffic from any source.

    Why it's wrong here

    Incorrect. The explicit deny statement blocks all traffic not matching the permit.

  • ✗

    Only traffic from source 10.0.0.0/16.

    Why it's wrong here

    Incorrect. The wildcard mask 0.255.255.255 matches /8, not /16.

Visual reference

Source Router + ACL permit 10.0.0.0/8 deny any Server 10.0.0.5 ✓ 192.168.1.1 ✗ dropped ACLs evaluate top-down; first match wins — implicit deny all at end

About these practice questions

Courseiva writes every 300-410 question from scratch — 1,966 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →

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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.