- A
Set a higher MED value on routes learned from the internet to make them less preferred.
Why wrong: MED is used for inbound traffic, not outbound.
- B
Set a higher local preference on the Direct Connect BGP session for the S3 prefixes.
Local preference influences outbound route selection; higher value is preferred.
- C
Disable the internet gateway for the VPC.
Why wrong: The on-premises traffic doesn't go through the VPC IGW.
- D
Set the AS_PATH prepend on the Direct Connect BGP session.
Why wrong: AS_PATH prepend makes a route less preferred, not more.
- E
Configure the on-premises router to advertise a more specific route for the S3 CIDR blocks over the Direct Connect BGP session.
Why wrong: Incorrect. The on-premises router does not advertise S3 CIDRs; AWS advertises them over the Direct Connect public VIF. Therefore, this configuration is not valid.
Direct Connect Public VIF BGP Local Preference
This ANS-C01 practice question tests your understanding of network management and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 with a public VIF to access S3. The on-premises network uses BGP to advertise a specific prefix to AWS. The company wants to ensure that traffic to S3 from on-premises always uses the Direct Connect connection and not the internet. Which TWO configurations must be in place?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
Set a higher local preference on the Direct Connect BGP session for the S3 prefixes.
To ensure on-premises traffic to S3 uses Direct Connect (public VIF) instead of the internet, the primary mechanism is to set a higher local preference on the Direct Connect BGP session for the S3 prefixes (B). Local preference is evaluated first in the BGP path selection process, making the Direct Connect path more attractive than internet paths. Option E is incorrect because the on-premises router does not advertise S3 CIDRs; AWS advertises them. Other methods like MED or AS path prepend are not as effective for this scenario when comparing routes from different ASes.
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.
- ✗
Set a higher MED value on routes learned from the internet to make them less preferred.
Why it's wrong here
MED is used for inbound traffic, not outbound.
- ✓
Set a higher local preference on the Direct Connect BGP session for the S3 prefixes.
Why this is correct
Local preference influences outbound route selection; higher value is preferred.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
- ✗
Disable the internet gateway for the VPC.
Why it's wrong here
The on-premises traffic doesn't go through the VPC IGW.
- ✗
Set the AS_PATH prepend on the Direct Connect BGP session.
Why it's wrong here
AS_PATH prepend makes a route less preferred, not more.
- ✗
Configure the on-premises router to advertise a more specific route for the S3 CIDR blocks over the Direct Connect BGP session.
Why it's wrong here
Incorrect. The on-premises router does not advertise S3 CIDRs; AWS advertises them over the Direct Connect public VIF. Therefore, this configuration is not valid.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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: Set a higher local preference on the Direct Connect BGP session for the S3 prefixes. — To ensure on-premises traffic to S3 uses Direct Connect (public VIF) instead of the internet, the primary mechanism is to set a higher local preference on the Direct Connect BGP session for the S3 prefixes (B). Local preference is evaluated first in the BGP path selection process, making the Direct Connect path more attractive than internet paths. Option E is incorrect because the on-premises router does not advertise S3 CIDRs; AWS advertises them. Other methods like MED or AS path prepend are not as effective for this scenario when comparing routes from different ASes.
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.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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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