- A
Configure a static route on the on-premises router for the VPC CIDR.
Why wrong: Incorrect: Static routes do not provide dynamic failover and may cause blackholing.
- B
Decrease the BGP hold timer to 10 seconds on the on-premises router.
Why wrong: Incorrect: Decreasing the hold timer increases sensitivity and may cause more flapping.
- C
Increase the BGP hold timer to 90 seconds on both the on-premises router and the AWS side.
Correct: A higher hold timer reduces the chance of BGP session flapping due to intermittent connectivity.
- D
Change the virtual interface to a public VIF to improve BGP stability.
Why wrong: Incorrect: Public VIF is for accessing public AWS services, not private VPC.
Question 1,244 of 1,705
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses AWS Direct Connect to connect its on-premises network to a VPC. The connection uses a private virtual interface (VIF) to access the VPC. The network team is monitoring the link and notices that the BGP session goes down intermittently. The team has checked the physical layer and found no issues. The BGP keepalive timer is set to 30 seconds on both sides. The network engineer suspects that the issue might be related to the BGP hold timer. What should the engineer do to stabilize the BGP session?
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
✓
Increase the BGP hold timer to 90 seconds on both the on-premises router and the AWS side.
Option C is correct because increasing the BGP hold timer to 90 seconds on both the on-premises router and the AWS side allows more time to receive keepalive messages, reducing the likelihood of the session going down due to transient network issues or slight delays. This stabilizes the BGP session without changing the underlying physical connection. Option A is incorrect because a static route would bypass BGP and remove the dynamic routing benefits. Option B is incorrect because decreasing the hold timer makes the session more sensitive to delays, worsening the flapping. Option D is incorrect because changing to a public VIF does not affect BGP stability and is unrelated to the hold timer issue.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a static route on the on-premises router for the VPC CIDR.
Why it's wrong here
Incorrect: Static routes do not provide dynamic failover and may cause blackholing.
- ✗
Decrease the BGP hold timer to 10 seconds on the on-premises router.
Why it's wrong here
Incorrect: Decreasing the hold timer increases sensitivity and may cause more flapping.
- ✓
Increase the BGP hold timer to 90 seconds on both the on-premises router and the AWS side.
- ✗
Change the virtual interface to a public VIF to improve BGP stability.
Why it's wrong here
Incorrect: Public VIF is for accessing public AWS services, not private VPC.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Increase the BGP hold timer to 90 seconds on both the on-premises router and the AWS side. — Option C is correct because increasing the BGP hold timer to 90 seconds on both the on-premises router and the AWS side allows more time to receive keepalive messages, reducing the likelihood of the session going down due to transient network issues or slight delays. This stabilizes the BGP session without changing the underlying physical connection. Option A is incorrect because a static route would bypass BGP and remove the dynamic routing benefits. Option B is incorrect because decreasing the hold timer makes the session more sensitive to delays, worsening the flapping. Option D is incorrect because changing to a public VIF does not affect BGP stability and is unrelated to the hold timer issue.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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