Which two statements are correct about DNS doctoring?
Correct Answer:
BD
Which two statements are true regarding NAT64? (Choose two.)
Correct Answer:
AD
Comprehensive Detailed Step-by-Step Explanation with All Juniper Security References
Understanding NAT64:
✑ NAT64 allows IPv6-only clients to communicate with IPv4 servers by translating IPv6 addresses to IPv4 addresses and vice versa.
✑ It is essential in environments where IPv6 clients need access to IPv4 resources.
Flow-Based vs. Packet-Based Forwarding Modes:
✑ Flow-Based Forwarding Mode:
✑ Packet-Based Forwarding Mode:
✑ Option A: An SRX Series device should be in flow-based forwarding mode for IPv4.
✑ Option B: An SRX Series device should be in packet-based forwarding mode for
IPv4.
✑ Option C: An SRX Series device should be in packet-based forwarding mode for IPv6.
✑ Option D: An SRX Series device should be in flow-based forwarding mode for
IPv6.
Key Points:
✑ NAT64 Requires Flow-Based Mode:
✑ Packet-Based Mode Limitations:
Juniper Security References:
✑ Juniper Networks Documentation:
✑ Understanding Flow-Based and Packet-Based Modes:
Conclusion:
✑ To implement NAT64 on an SRX Series device, both IPv4 and IPv6 traffic must be processed in flow-based forwarding mode.
✑ Therefore, Options A and D are the correct statements.
Your IPsec tunnel is configured with multiple security associations (SAs). Your SRX Series device supports the CoS-based IPsec VPNs with multiple IPsec SAs feature. You are asked to configure CoS for this tunnel.
Which two statements are true in this scenario? (Choose two.)
Correct Answer:
AD
Which two statements are true regarding NAT64? (Choose two.)
Correct Answer:
BC
You need to set up source NAT so that external hosts can initiate connections to an internal device, but only if a connection to the device was first initiated by the internal device.
Which type of NAT solution provides this functionality?
Correct Answer:
C
Persistent NAT with target host allows external hosts to establish
connections only when the internal device initiates a session first, ideal for specific interactive applications. Refer to Juniper Persistent NAT Documentation.
The scenario requires that external hosts be able to initiate a connection only if the internal device has already initiated a connection. The correct solution is Persistent NAT with target host, which ensures that a specific external host can initiate new connections back to the internal device, but only after the internal device has established a session first.
✑ Persistent NAT with Target Host (Answer C): This allows the internal device to
initiate a connection, and once established, the specified external host can also initiate new connections to the internal device on the same NAT mapping.
Example Configuration: bash
set security nat source persistent-nat permit target-host-port
This solution is appropriate when controlled bidirectional communication is required based on an internal-initiated connection.
: Juniper persistent NAT documentation.
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