hardMultiple ChoiceObjective-mapped
300-410 Management traffic is being dropped Practice Question
Management traffic is being dropped. Router R1 has: access-list 100 deny ip any any log, applied to VTY lines. Remote access via SSH fails, but console works. What is the root cause?
⚠ Common exam trap
Many exam-takers think the ACL is applied to an interface (Option C) or that the `log` keyword causes the problem, when in fact the issue is the order of ACL entries—specifically, the missing permit for SSH before the global deny.
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
✓
The ACL should permit SSH before the deny statement.
The ACL `access-list 100 deny ip any any log` applied to VTY lines denies all IP traffic, including SSH, before any permit statement can match. Since SSH traffic is denied, remote access fails. The correct fix is to add a `permit tcp any any eq 22` statement before the deny to allow SSH management traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The ACL should permit SSH before the deny statement.
Why this is correct
Without a permit statement for SSH, the deny blocks all traffic.
- ✗
The VTY lines require transport input ssh, but the ACL is irrelevant.
Why it's wrong here
Transport input controls protocol, but ACL filters traffic.
- ✗
The ACL is applied to the wrong interface.
Why it's wrong here
VTY ACL filters incoming Telnet/SSH; application is correct.
- ✗
The log keyword causes performance issues, not drops.
Why it's wrong here
Logging does not cause drops; the deny does.
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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.