JN0-106 Networking Fundamentals Practice Question

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.

• ✗

  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.

  Why it's wrong here

  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.

• ✗

  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 it's wrong here

  Applying the IPsec VPN to an interface such as st0 before defining IKE and IPsec parameters is invalid because the interface binding references security associations that do not yet exist. On Junos, the 'security ipsec vpn' configuration must include both an IKE gateway (Phase 1) and an IPsec proposal/policy (Phase 2) before the tunnel can be bound to a secure tunnel interface; otherwise, the commit will fail or the tunnel will be inoperative. The correct sequence places interface binding last, after the cryptographic parameters and security policies are in place, ensuring the tunnel is fully defined before it is activated.

Go deeper

Related to this question