- A
Step 1: Configure IKE proposals and policies (Phase 1). Step 2: Configure IPsec proposals and policies (Phase 2). Step 3: Configure security policies to permit VPN traffic. Step 4: Apply the IPsec VPN configuration to an interface (e.g., st0).
This order follows the logical dependency: IKE must be set up first to establish a secure channel, then IPsec parameters define the encryption for data, security policies control traffic flow, and finally the VPN is bound to an interface.
- B
Step 1: Configure IPsec proposals and policies (Phase 2). Step 2: Configure IKE proposals and policies (Phase 1). Step 3: Apply the IPsec VPN configuration to an interface. Step 4: Configure security policies.
Why wrong: This order is incorrect because IKE Phase 1 must be configured before Phase 2, as Phase 2 depends on the secure tunnel established by Phase 1. Also, security policies should be configured before applying to an interface to ensure proper traffic handling.
- C
Step 1: Configure security policies to permit VPN traffic. Step 2: Configure IKE proposals and policies. Step 3: Configure IPsec proposals and policies. Step 4: Apply the IPsec VPN configuration to an interface.
Why wrong: This order is incorrect because security policies reference the VPN tunnel, which does not exist until IKE and IPsec are configured. The policies should be created after the VPN is set up to avoid referencing undefined resources.
- D
Step 1: Apply the IPsec VPN configuration to an interface. Step 2: Configure IKE proposals and policies. Step 3: Configure IPsec proposals and policies. Step 4: Configure security policies.
Why wrong: This order is incorrect because applying the VPN to an interface requires that IKE and IPsec parameters are already defined. The interface binding is the final step after all configurations are in place.
JNCIA-JUNOS Networking Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of networking fundamentals. 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.
Arrange the steps to configure an IPsec VPN on a Junos SRX in the correct order.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Step 1: Configure IKE proposals and policies (Phase 1). Step 2: Configure IPsec proposals and policies (Phase 2). Step 3: Configure security policies to permit VPN traffic. Step 4: Apply the IPsec VPN configuration to an interface (e.g., st0).
IPsec VPN setup involves IKE for key exchange, IPsec for encryption, and binding to an interface.
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.
- ✓
Step 1: Configure IKE proposals and policies (Phase 1). Step 2: Configure IPsec proposals and policies (Phase 2). Step 3: Configure security policies to permit VPN traffic. Step 4: Apply the IPsec VPN configuration to an interface (e.g., st0).
Why this is correct
This order follows the logical dependency: IKE must be set up first to establish a secure channel, then IPsec parameters define the encryption for data, security policies control traffic flow, and finally the VPN is bound to an interface.
Related concept
Standard ACLs match source addresses.
- ✗
Step 1: Configure IPsec proposals and policies (Phase 2). Step 2: Configure IKE proposals and policies (Phase 1). Step 3: Apply the IPsec VPN configuration to an interface. Step 4: Configure security policies.
Why it's wrong here
This order is incorrect because IKE Phase 1 must be configured before Phase 2, as Phase 2 depends on the secure tunnel established by Phase 1. Also, security policies should be configured before applying to an interface to ensure proper traffic handling.
- ✗
Step 1: Configure security policies to permit VPN traffic. Step 2: Configure IKE proposals and policies. Step 3: Configure IPsec proposals and policies. Step 4: Apply the IPsec VPN configuration to an interface.
- ✗
Step 1: Apply the IPsec VPN configuration to an interface. Step 2: Configure IKE proposals and policies. Step 3: Configure IPsec proposals and policies. Step 4: Configure security policies.
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.
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.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
Got this wrong? Here's your next step.
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 JNCIA-JUNOS ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
Networking Fundamentals — This question tests Networking Fundamentals — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Step 1: Configure IKE proposals and policies (Phase 1). Step 2: Configure IPsec proposals and policies (Phase 2). Step 3: Configure security policies to permit VPN traffic. Step 4: Apply the IPsec VPN configuration to an interface (e.g., st0). — IPsec VPN setup involves IKE for key exchange, IPsec for encryption, and binding to an interface.
What should I do if I get this JNCIA-JUNOS 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 JNCIA-JUNOS ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 11, 2026
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