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…

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. Reference: Juniper Networks Layer 2 Interface

Documentation.