This 300-410 practice question tests your understanding of ipsec site-to-site vpn. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IKE phase 1 negotiation has failed; the pre-shared key may be mismatched.
The MM_NO_STATE indicates that the IKE phase 1 negotiation has not progressed past the initial state. This typically means the peer is not responding to the ISAKMP proposals, often due to mismatched pre-shared keys or access-list blocking UDP port 500.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 IPsec SA is established and working correctly.
Why it's wrong here
MM_NO_STATE means no state has been established; IPsec SA would show QM_IDLE or other states.
✓
The IKE phase 1 negotiation has failed; the pre-shared key may be mismatched.
Why this is correct
MM_NO_STATE indicates no ISAKMP SA has been formed, often due to pre-shared key mismatch or firewall blocking UDP 500.
Related concept
Standard ACLs match source addresses.
✗
The tunnel is up but no interesting traffic is triggering the IPsec SA.
Why it's wrong here
No ISAKMP SA exists, so no IPsec SA can be formed regardless of traffic.
✗
The ISAKMP SA is in MM_ACTIVE state, meaning phase 1 is complete.
Why it's wrong here
The state shown is MM_NO_STATE, not MM_ACTIVE.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
MM_NO_STATE means no state has been established; IPsec SA would show QM_IDLE or other states.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
IPsec Site-to-Site VPN — This question tests IPsec Site-to-Site VPN — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The IKE phase 1 negotiation has failed; the pre-shared key may be mismatched. — The MM_NO_STATE indicates that the IKE phase 1 negotiation has not progressed past the initial state. This typically means the peer is not responding to the ISAKMP proposals, often due to mismatched pre-shared keys or access-list blocking UDP port 500.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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