Which of the following types of networks are supported on an Nokia 7750 SR for OSPF? Choose two answers.

The Nokia 7750 SR platform running SR OS supports all four standard OSPF network types. However, Broadcast and Point-to-Point are the most fundamental and widely deployed. The network type is automatically selected based on the interface's encapsulation, but can be manually configured. Broadcast is the default for Ethernet interfaces, which are multi-access and broadcast-capable. Point-to-Point is the default for interfaces that connect only two routers, such as those using PPP/HDLC encapsulation. These two types represent the most common OSPF configurations in modern networks.

B. Non-broadcast multi-access: While fully supported on the 7750 SR, this type is for specific multi-access networks that lack native broadcast capabilities (e.g., legacy Frame Relay) and is not a primary type.
D. Point-to-multipoint: This is also fully supported and is typically used as an alternative to NBMA. It is not a default network type for common physical interfaces.

1. Nokia 7750 SR OS Router Configuration Guide, Release 21.10.R1, Section: OSPF Interface Parameters.

This section details the OSPF interface-level configuration options. It states, "The network type is selected from the existing interface's encapsulation type... For Ethernet, the default OSPF interface type is broadcast. For all other encapsulations, the default OSPF interface type is point-to-point." This confirms that Broadcast and Point-to-Point are the primary default types.

2. Nokia 7750 SR OS OSPF and IS-IS Command Reference, Release 21.10.R1, Section: OSPF Interface Commands.

The command config>router>ospf>area>interface>network-type is documented with the following possible values: {broadcast | non-broadcast | point-to-point | point-to-multipoint}. This explicitly confirms that all four network types are supported configuration options, even though A and C are the most common defaults.