In the Nokia Service Router Operating System (SR OS), a network policy is not automatically applied to router interfaces by default. Network policies, which define the Quality of Service (QoS) treatment for ingress traffic on a network port, must be explicitly created and then associated with a specific router interface by a network administrator. While the system has default QoS behaviors and pre-defined forwarding classes, an actual network policy object is not applied to an interface until it is configured to do so.

The statement "True" is incorrect because it implies an automatic, system-wide application of a default network policy to all router interfaces. This contradicts the SR OS configuration model, which requires deliberate and explicit association of a QoS policy with an interface for it to become active on that interface. In the absence of an explicitly applied policy, the interface uses system-level default parameters, but it does not have a "default network policy" in the sense of a configurable policy object being actively applied.

1. Nokia 7750 SR OS Quality of Service Guide, Release 21.10.R1, Document Part Number: 3HE 17279 AAAD TQZZA, Section: Network QoS Policies.

Page 103, "Network Policy Application": This section states, "Network policies are applied to IP interfaces." It further details that "When a network policy is created, it is not active until it is applied to an IP interface." This confirms that application is an explicit action, not a default state.

2. Nokia 7750 SR OS Basic System Configuration Guide, Release 21.10.R1, Document Part Number: 3HE 17275 AAAD TQZZA, Section: Router Interface Configuration Commands.

Page 413, "qos": The command syntax qos network-policy-id is shown within the config>router>interface context. The description states this command "associates a network QoS policy with the IP interface." The existence of this explicit command demonstrates that a policy must be manually applied and is not present by default.