ANS-C01 Network Management and Operations Practice Question
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.
Network Topology
A network engineer ran the command shown in the exhibit to check VPC peering connections. Two peering connections are active. The engineer wants to verify that routes are correctly configured. What additional step is needed to ensure that instances in vpc-11111111 can communicate with instances in vpc-33333333?
Network Topology
A
Configure security groups to allow traffic between the VPCs.
Why wrong: Security groups are needed but routing is the primary issue.
B
Enable DNS resolution for the peering connection.
Why wrong: DNS resolution is optional.
C
Add a route in the route table of vpc-11111111 pointing to vpc-33333333 via the peering connection, and a route in vpc-33333311 pointing to vpc-11111111 via the same peering connection.
Routes are needed in both VPCs.
D
Ensure that the peering connection is in the 'active' state.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a route in the route table of vpc-11111111 pointing to vpc-33333333 via the peering connection, and a route in vpc-33333311 pointing to vpc-11111111 via the same peering connection.
The correct answer is C. For VPC peering to enable communication between instances in different VPCs, route tables in each VPC must have routes pointing to the peering connection. Specifically, vpc-11111111 needs a route to the CIDR of vpc-33333333 via the peering connection, and vpc-33333333 needs a route to the CIDR of vpc-11111111 via the same peering connection. Option A is incorrect because security groups are stateful and allow return traffic, but they do not replace the need for routing. Option B is incorrect because DNS resolution is optional and not required for IP-based communication. Option D is incorrect because the peering connection is already active, as stated.
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 security groups to allow traffic between the VPCs.
Why it's wrong here
Security groups are needed but routing is the primary issue.
Add a route in the route table of vpc-11111111 pointing to vpc-33333333 via the peering connection, and a route in vpc-33333311 pointing to vpc-11111111 via the same peering connection.
Ensure that the peering connection is in the 'active' state.
Why it's wrong here
It is already active.
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 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.
Visual reference
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.
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: Add a route in the route table of vpc-11111111 pointing to vpc-33333333 via the peering connection, and a route in vpc-33333311 pointing to vpc-11111111 via the same peering connection. — The correct answer is C. For VPC peering to enable communication between instances in different VPCs, route tables in each VPC must have routes pointing to the peering connection. Specifically, vpc-11111111 needs a route to the CIDR of vpc-33333333 via the peering connection, and vpc-33333333 needs a route to the CIDR of vpc-11111111 via the same peering connection. Option A is incorrect because security groups are stateful and allow return traffic, but they do not replace the need for routing. Option B is incorrect because DNS resolution is optional and not required for IP-based communication. Option D is incorrect because the peering connection is already active, as stated.
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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