This 300-410 practice question tests your understanding of ipsec site-to-site vpn. 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 runs the following command to troubleshoot an IPsec Site-to-Site VPN issue:
R1# show crypto map
Crypto Map "CMAP" 10 ipsec-isakmp
Peer = 192.168.2.2
Extended IP access list 101
access-list 101 permit ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255
Current peer: 192.168.2.2
Security association lifetime: 4608000 kilobytes/3600 seconds
PFS (Y/N): N
Transform sets={myset, }
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The crypto map is correctly configured for a site-to-site VPN with the peer 192.168.2.2.
Option B is correct because the output shows a properly configured IPsec site-to-site VPN crypto map. It includes a peer (192.168.2.2), an extended ACL (101) that correctly matches the local and remote subnets (192.168.1.0/24 and 192.168.2.0/24), a transform set (myset), and is applied to Tunnel0, which is typical for a site-to-site VPN. The security association lifetime and PFS settings are also present, confirming a valid configuration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The crypto map is misconfigured because it uses an extended ACL with source and destination subnets.
Why it's wrong here
Using an extended ACL is correct for site-to-site VPN.
✓
The crypto map is correctly configured for a site-to-site VPN with the peer 192.168.2.2.
Why this is correct
The configuration matches typical site-to-site VPN requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
The crypto map is missing the transform set.
Why it's wrong here
The transform set 'myset' is listed.
✗
The crypto map should be applied to the physical interface instead of the tunnel.
Why it's wrong here
For tunnel-based VPNs, the crypto map is applied to the tunnel interface.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that an extended ACL in a crypto map is a misconfiguration, when in fact it is required for site-to-site VPNs to define the traffic to be encrypted.
Detailed technical explanation
How to think about this question
The crypto map binds IPsec parameters like the peer, ACL, transform set, and lifetime to an interface. The extended ACL (101) defines interesting traffic that triggers IPsec encryption; for site-to-site VPNs, it typically matches source and destination subnets. The transform set specifies encryption and authentication algorithms (e.g., AES, SHA), and PFS (Perfect Forward Secrecy) enhances security by generating new Diffie-Hellman keys for each SA. In real-world scenarios, misconfigured ACLs or missing transform sets are common causes of VPN failures.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
IPsec Site-to-Site VPN — This question tests IPsec Site-to-Site VPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The crypto map is correctly configured for a site-to-site VPN with the peer 192.168.2.2. — Option B is correct because the output shows a properly configured IPsec site-to-site VPN crypto map. It includes a peer (192.168.2.2), an extended ACL (101) that correctly matches the local and remote subnets (192.168.1.0/24 and 192.168.2.0/24), a transform set (myset), and is applied to Tunnel0, which is typical for a site-to-site VPN. The security association lifetime and PFS settings are also present, confirming a valid configuration.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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