ANS-C01 Network Management and Operations Practice Question
A network engineer is diagnosing connectivity issues between an on-premises network and AWS over a Direct Connect connection. The BGP session is established, and the engineer can ping the VPC's private IP addresses. However, TCP connections to EC2 instances are failing. Which TWO actions should the engineer take to identify the issue?
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
✓
Review the security group rules associated with the EC2 instance
Options A and E are correct. Checking the security group rules (A) is critical because security groups are stateful and may be blocking inbound TCP while allowing ICMP. Checking the EC2 instance's operating system firewall (E) is essential because OS firewalls can also block TCP while allowing ICMP. Option B is incorrect because the BGP session is already established. Option C is incorrect because the VPC route table is likely correct if pings work. Option D is incorrect because MTU issues would affect all traffic, not just TCP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Review the security group rules associated with the EC2 instance
Why this is correct
Security groups may be blocking TCP traffic.
- ✗
Review the VPC route table for the subnet
Why it's wrong here
Pings work, so routing is likely correct.
- ✗
Verify the BGP session status
Why it's wrong here
BGP session is already established.
- ✗
Check the MTU settings on the Direct Connect virtual interface
Why it's wrong here
MTU issues would typically affect both ping and TCP.
- ✓
Check the EC2 instance's operating system firewall
Why this is correct
OS firewall can block TCP while allowing ICMP.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.