QUESTION: 9

You configure two Ethernet interfaces on your SRX Series device as Layer 2 interfaces and add them to the same VLAN. The SRX is using the default L2-learning setting. You do not add the interfaces to a security zone.
Which two statements are true in this scenario? (Choose two.)

You are unable to apply stateful security features to traffic that is switched between the two interfaces.
You are able to apply stateful security features to traffic that enters and exits the VLAN.
The interfaces will not forward traffic by default.
You cannot add Layer 2 interfaces to a security zone.

Answer(s): A,C

Explanation:

When Ethernet interfaces are configured as Layer 2 and added to the same VLAN without being assigned to a security zone, they will not forward traffic by default. Additionally, because they are operating in a pure Layer 2 switching mode, they lack the capability to enforce stateful security policies. For further details, refer to Juniper Ethernet Switching Layer 2 Documentation.

Explanation of Answer A (Unable to Apply Stateful Security Features):
When two interfaces are configured as Layer 2 interfaces and belong to the same VLAN but are not assigned to any security zone, traffic switched between them is handled purely at Layer 2. Stateful security features, such as firewall policies, are applied at Layer 3, so traffic between these interfaces will not undergo any stateful inspection or firewalling by default. Explanation of Answer C (Interfaces Will Not Forward Traffic):
In Junos, Layer 2 interfaces must be added to a security zone to allow traffic forwarding. Since the interfaces in this scenario are not part of a security zone, they will not forward traffic by default until assigned to a zone. This is a security measure to prevent unintended forwarding of traffic.
Juniper Security

Reference:

Layer 2 Interface Configuration: Layer 2 interfaces must be properly assigned to security zones to enable traffic forwarding and apply security policies.

Juniper Networks Layer 2 Interface Documentation.

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QUESTION: 10

Which two statements are true about the procedures the Junos security device uses when handling traffic destined for the device itself? (Choose two.)

If the received packet is addressed to the ingress interface, then the device first performs a security policy evaluation for the junos-host zone.
If the received packet is destined for an interface other than the ingress interface, then the device performs a security policy evaluation for the junos-host zone.
If the received packet is addressed to the ingress interface, then the device first examines the host- inbound-traffic configuration for the ingress interface and zone.
If the received packet is destined for an interface other than the ingress interface, then the device performs a security policy evaluation based on the ingress and egress zone.

Answer(s): B,C

Explanation:

When handling traffic that is destined for itself, the SRX examines the host-inbound-traffic configuration for the ingress interface and the associated security zone. It evaluates whether the traffic should be allowed based on this configuration. Traffic not addressed to the ingress interface is handled based on security policies within the junos-host zone, which applies to traffic directed to the SRX itself. For more details, refer to Juniper Host Inbound Traffic Documentation.

When handling traffic that is destined for the SRX device itself (also known as host-bound traffic), the SRX follows a specific process to evaluate the traffic and apply the appropriate security policies. The junos-host zone is a special security zone used for managing traffic destined for the device itself, such as management traffic (SSH, SNMP, etc.).
Explanation of Answer B (Packet to a Different Interface):
If the packet is destined for an interface other than the ingress interface, the SRX performs a security policy evaluation specifically for the junos-host zone. This ensures that management or host-bound traffic is evaluated according to the security policies defined for that zone. Explanation of Answer C (Packet to the Ingress Interface):
If the packet is addressed to the ingress interface, the device first checks the host-inbound-traffic configuration for the ingress interface and zone. This configuration determines whether certain types of traffic (such as SSH, HTTP, etc.) are allowed to reach the device on that specific interface.
Step-by-Step Handling of Host-Bound Traffic:
Host-Inbound Traffic: Define which services are allowed to the SRX device itself:
bash set security zones security-zone <zone-name> host-inbound-traffic system-services ssh Security Policy for junos-host: Ensure policies are defined for managing traffic destined for the SRX device:
bash set security policies from-zone <zone-name> to-zone junos-host policy allow-ssh match source- address any set security policies from-zone <zone-name> to-zone junos-host policy allow-ssh match destination- address any
Juniper Security

Reference:

Junos-Host Zone: This special zone handles traffic destined for the SRX device, including management traffic. Security policies must be configured to allow this traffic.

Juniper Networks Host-Inbound Traffic Documentation.

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QUESTION: 11

Exhibit:

You have deployed an SRX Series device as shown in the exhibit. The devices in the Local zone have recently been added, but their SRX interfaces have not been configured. You must configure the SRX to meet the following requirements:
Devices in the 10.1.1.0/24 network can communicate with other devices in the same network but not with other networks or the SRX.
You must be able to apply security policies to traffic flows between devices in the Local zone.
Which three configuration elements will be required as part of your configuration? (Choose three.)

set security zones security-zone Local interfaces ge-0/0/1.0
set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan-members 10
set protocols l2-learning global-mode switching
set protocols l2-learning global-mode transparent-bridge
set security zones security-zone Local interfaces irb.10

Answer(s): A,B,D

Explanation:

In this scenario, we need to configure the SRX Series device so that devices in the Local zone (VLAN 10, 10.1.1.0/24 network) can communicate with each other but not with other networks or the SRX itself. Additionally, you must be able to apply security policies to traffic flows between the devices in the Local zone.
Explanation of Answer A (Assigning Interface to Security Zone):
You need to assign the interface ge-0/0/1.0 to the Local security zone. This is crucial because the SRX only applies security policies to interfaces assigned to security zones. Without this, traffic between devices in the Local zone won't be processed by security policies.
Configuration:

set security zones security-zone Local interfaces ge-0/0/1.0 Explanation of Answer B (Configuring Ethernet-Switching for VLAN 10):
Since we are using Layer 2 switching between devices in VLAN 10, we need to configure the interface to operate in Ethernet switching mode and assign it to VLAN 10.
Configuration:

set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan-members 10 Explanation of Answer D (Transparent Bridging Mode for Layer 2):
The global mode for Layer 2 switching on the SRX device must be set to transparent-bridge. This ensures that the SRX operates in Layer 2 mode and can switch traffic between devices without routing.
Configuration:

set protocols l2-learning global-mode transparent-bridge Summary:
Interface Assignment: Interface ge-0/0/1.0 is assigned to the Local zone to allow policy enforcement. Ethernet-Switching: The interface is configured for Layer 2 Ethernet switching in VLAN 10. Transparent Bridging: The SRX is configured in Layer 2 transparent-bridge mode for switching between devices.
Juniper Security

Reference:

Layer 2 Bridging and Switching Overview: This mode allows the SRX to act as a Layer 2 switch for forwarding traffic between VLAN members without routing.

Juniper Transparent Bridging Documentation.

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QUESTION: 12

Exhibit:

Referring to the exhibit, which statement is true?

SRG1 is configured in hybrid mode.
The ICL is encrypted.
If SRG1 moves to peer 2, peer 1 will drop packets sent to the SRG1 interfaces.
If SRG1 moves to peer 2, peer 1 will forward packets sent to the SRG1 interfaces.

Answer(s): D

Explanation:

The exhibit describes a Chassis Cluster configuration with high availability (HA) settings. The key information is related to Service Redundancy Group 1 (SRG1) and its failover behavior between the two peers.
Explanation of Answer D (Packet Forwarding after Failover):
In a typical SRX HA setup with active/backup configuration, if the SRG1 group moves to peer 2 (the backup), peer 1 (previously the active node) will forward packets to peer 2 instead of dropping them. This ensures smooth failover and seamless continuation of services without packet loss. This behavior is part of the active/backup failover process in SRX chassis clusters, where the standby peer takes over traffic processing without disruption.
Juniper Security

Reference:

Chassis Cluster Failover Behavior: When a service redundancy group fails over to the backup peer, the previously active peer forwards traffic to the new active node.

Juniper Chassis Cluster Documentation.

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Free JN0-637 Exam Braindumps (page: 4)

QUESTION: 9

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QUESTION: 10

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QUESTION: 11

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QUESTION: 12

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