This 300-410 practice question tests your understanding of ipsec site-to-site vpn. 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.
Given the partial configuration:
crypto isakmp policy 10
encryption aes 256
authentication pre-share
group 14
!
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The key will be accepted from any peer, creating a security vulnerability.
The `crypto isakmp key` command with address `0.0.0.0 0.0.0.0` acts as a wildcard, meaning the pre-shared key will be accepted from any peer IP address during IKE Phase 1 authentication. This effectively disables peer-specific validation, allowing any device that knows the key to establish an ISAKMP SA, which is a significant security vulnerability.
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 key will be used only for peer 192.168.1.2 because the crypto map specifies that peer.
Why it's wrong here
The crypto map peer does not restrict the key; the key is matched based on the source IP of IKE packets.
✓
The key will be accepted from any peer, creating a security vulnerability.
Why this is correct
0.0.0.0 0.0.0.0 is a wildcard that matches any IP address, so any peer can use this key.
Related concept
Read the scenario before looking for a memorised answer.
✗
The configuration will fail because the key must specify a specific peer address.
Why it's wrong here
The command is valid; it just uses a wildcard.
✗
The key will be ignored because there is no ISAKMP policy with a lifetime.
Why it's wrong here
The lifetime is optional and defaults to 86400 seconds; the key is still used.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that the crypto map's `set peer` command restricts which peers can authenticate with the pre-shared key, but in reality, the ISAKMP key wildcard overrides that restriction at the IKE layer.
Trap categories for this question
Command / output trap
The command is valid; it just uses a wildcard.
Detailed technical explanation
How to think about this question
Under the hood, the `crypto isakmp key` command creates an IKE identity entry in the keyring database; when the address is `0.0.0.0 0.0.0.0`, it matches any peer IP address during IKE Main Mode or Aggressive Mode. In a real-world scenario, this is often misused for lab setups but is dangerous in production because an attacker who obtains the key (e.g., via packet capture if not encrypted) can impersonate any peer and establish a VPN tunnel.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 key will be accepted from any peer, creating a security vulnerability. — The `crypto isakmp key` command with address `0.0.0.0 0.0.0.0` acts as a wildcard, meaning the pre-shared key will be accepted from any peer IP address during IKE Phase 1 authentication. This effectively disables peer-specific validation, allowing any device that knows the key to establish an ISAKMP SA, which is a significant security vulnerability.
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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Question Discussion
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