QUESTION: 33

You are using ADVPN to deploy a hub-and-spoke VPN to connect your enterprise sites.
Which two statements are true in this scenario? (Choose two.)

ADVPN creates a full-mesh topology.
IBGP routing is required.
OSPF routing is required.
Certificate-based authentication is required.

Answer(s): C,D

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QUESTION: 34

You want to create a connection for communication between tenant systems without using physical revenue ports on the SRX Series device.
What are two ways to accomplish this task? (Choose two.)

Use an external router.
Use an interconnect VPLS switch.
Use a secure wire.
Use a point-to-point logical tunnel.

Answer(s): B,D

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An ADVPN configuration has been verified on both the hub and spoke devices and it seems fine.
However, OSPF is not functioning as expected.

Referring to the exhibit, which two statements under interface st0.0 on both the hub and spoke devices would solve this problem? (Choose two.)

interface-type p2mp
dynamic-neighbors
passive
interface-type p2p

Answer(s): A,B

Explanation:

For ADVPN with OSPF, using a point-to-multipoint (p2mp) interface type and enabling dynamic-

neighbors are crucial. This configuration allows dynamic discovery of neighbors and the establishment of tunnels. For more information, refer to Juniper ADVPN Configuration Guide.

In the ADVPN configuration, OSPF isn't functioning as expected due to the interface configuration on st0.0. Here are the adjustments needed:
Interface Type p2mp (Answer A): OSPF requires that the tunnel interface be set to p2mp (point-to- multipoint) to allow OSPF to communicate with multiple dynamic neighbors over the ADVPN tunnels.
Command Example:
bash set interfaces st0.0 family inet ospf interface-type p2mp Dynamic Neighbors (Answer B): The dynamic neighbors statement allows OSPF to discover and communicate with dynamically established spokes in an ADVPN environment. This is essential for ADVPN to function properly since the tunnel endpoints are not static.
Command Example:
bash set protocols ospf area 0.0.0.0 interface st0.0 dynamic-neighbors These settings ensure OSPF properly functions over dynamically created ADVPN tunnels.

Reference:

Juniper ADVPN and OSPF configuration.

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QUESTION: 36

You have deployed an SRX Series device at your network edge to secure Internet-bound sessions for your local hosts using source NAT. You want to ensure that your users are able to interact with applications on the Internet that require more than one TCP session for the same application session.
Which two features would satisfy this requirement? (Choose two.)

address persistence
STUN
persistent NAT
double NAT

Answer(s): A,C

Explanation:

Address persistence ensures that the same NAT IP address is used for all sessions originating from a single source IP. Persistent NAT maintains connections for applications needing multiple sessions, like VoIP. Additional details are available in Juniper NAT Documentation.

For applications that require multiple TCP sessions for the same application session (such as VoIP or certain online games), the SRX device needs to handle NAT properly to maintain session continuity.
Here's what helps:
Address Persistence (Answer A): Address persistence ensures that multiple sessions initiated by the same internal host are mapped to the same external IP address. This is crucial for applications that use multiple TCP sessions to maintain a stateful connection with the external server.

Command Example:
bash set security nat source persistent-nat address-persistence Persistent NAT (Answer C): This feature allows the external server to initiate new connections to the internal client using the same NAT translation. It's essential for applications that require consistent NAT mappings across multiple sessions.
Command Example:
bash set security nat source persistent-nat permit target-host-port These features ensure that applications with multiple TCP sessions work seamlessly across NAT.

Reference:

Juniper NAT and persistent NAT documentation.

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QUESTION: 33

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QUESTION: 35

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QUESTION: 36

Explanation:

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