Quick Answer
The answer is the AWS BGP peer IP address and the BGP ASN. BGP peering requires these two critical pieces of information because the Border Gateway Protocol establishes a TCP connection between two routers using the remote peer’s IP address, and the Autonomous System Number (ASN) identifies each routing domain, enabling the exchange of routing prefixes. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of the foundational BGP configuration steps for Direct Connect, often appearing in scenario-based questions where you must identify missing parameters from a provided configuration. A common trap is confusing the on-premises router’s own ASN with the AWS peer ASN—remember, you need the remote peer’s IP and ASN, not your own. Memory tip: “Peer IP and Peer ASN—without both, BGP won’t begin.”
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 network engineer is configuring a new AWS Direct Connect connection and needs to establish BGP peering with the AWS side. The engineer has received the BGP configuration from the AWS Direct Connect endpoint. Which information is required to complete the BGP configuration on the on-premises router?
The AWS Side BGP password and MD5 hash
Why wrong: BGP authentication is optional.
The AWS BGP peer IP address and the BGP ASN
These are the key BGP parameters.
The Amazon side routing table and prefix list
Why wrong: These are learned via BGP, not configured.
The Direct Connect virtual interface ID and VLAN ID
Why wrong: VLAN ID is for the virtual interface, not BGP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The AWS BGP peer IP address and the BGP ASN
B is correct because BGP peering requires the remote peer's IP address and Autonomous System Number (ASN) to establish a TCP connection and exchange routing information. AWS provides these two values in the Direct Connect endpoint configuration, and the on-premises router must use them to configure the BGP neighbor statement. Without both, the BGP session cannot be established.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The AWS Side BGP password and MD5 hash
Why it's wrong here
BGP authentication is optional.
The AWS BGP peer IP address and the BGP ASN
Why this is correct
These are the key BGP parameters.
Related concept
Read the scenario before looking for a memorised answer.
The Amazon side routing table and prefix list
Why it's wrong here
These are learned via BGP, not configured.
The Direct Connect virtual interface ID and VLAN ID
Common exam traps
The trap here is that candidates often confuse Layer 2 parameters (VLAN ID, VIF ID) with Layer 3 BGP requirements, or assume authentication is mandatory, when in fact only the BGP peer IP and ASN are essential to establish the BGP session.
Detailed technical explanation
BGP peering between an on-premises router and AWS Direct Connect uses eBGP (External BGP) with a public or private ASN assigned by AWS. The BGP peer IP address is typically a /30 subnet from the Amazon side, and the AWS ASN is usually 64512 (for public VIF) or a private ASN for private VIF. The on-premises router must specify the neighbor IP and remote-as in the BGP configuration, and the BGP session will use TCP port 179 to exchange routes.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
The correct answer is: The AWS BGP peer IP address and the BGP ASN — B is correct because BGP peering requires the remote peer's IP address and Autonomous System Number (ASN) to establish a TCP connection and exchange routing information. AWS provides these two values in the Direct Connect endpoint configuration, and the on-premises router must use them to configure the BGP neighbor statement. Without both, the BGP session cannot be established.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer is configuring an AWS Site-to-Site VPN with dynamic routing (BGP). The customer gateway device is a Cisco router. The VPN tunnel is established, but BGP is not forming. Which configuration on the Cisco router is most likely missing?
hardWhy D: Option C is correct. The BGP neighbor must have the correct ASN; a mismatch prevents session formation. Option A is wrong because the tunnel is already established, so IKE is fine. Option B is wrong because the tunnel interface is up. Option D is wrong because it's a routing protocol, not a VPN parameter.
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Last reviewed: Jun 24, 2026
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.
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