Which of the following OSPF area types are supported by the Alcatel- Lucent 7750 SR? Choose two answers.

The Nokia 7750 SR, running SR OS, supports standard OSPFv2 and OSPFv3 area types as defined by the IETF. This includes stub areas (RFC 2328) and not-so-stubby areas (NSSA) (RFC 3101). Stub areas block external Type 5 LSAs and rely on a default route from the ABR to reach external destinations, reducing the link-state database size. NSSAs are an extension of stub areas that allow the injection of external routes from an ASBR within the NSSA as Type 7 LSAs, which are then translated to Type 5 LSAs by the ABR.

B. Level1 area WC: "Level 1" is a term used to describe an area within the IS-IS routing protocol, not OSPF.
D. Partially stubby areas: This is a proprietary Cisco term and not a standard IETF-defined OSPF area type supported by the Nokia 7750 SR.
E. Level 2 areas: "Level 2" refers to the backbone in the IS-IS routing protocol, which is analogous to OSPF's Area 0, but the terminology is incorrect for OSPF.

1. Nokia 7750 SR OS Routing Protocols Guide, Release 22.10.R1. In the OSPF section, under "OSPF Areas", the guide details the configuration and characteristics of different area types. It explicitly describes support for "Stub Areas" and "Not-So-Stubby-Areas (NSSAs)". The configuration commands config>router>ospf>area>stub and config>router>ospf>area>nssa are documented. (Document ID: 3HE 18101 AAAC TQZZA, Section: OSPF Areas).

2. RFC 2328, OSPF Version 2. This foundational document defines the operation of OSPF, including the concept of stub areas. Section 3.6, "Stub Areas," specifies that these areas do not carry external LSAs (Type 5), which is a feature supported by the 7750 SR.

3. RFC 3101, The OSPF Not-So-Stubby Area (NSSA) Option. This RFC defines the NSSA area type, which is an extension to the stub area functionality. The Nokia 7750 SR fully implements this standard, allowing for the redistribution of external routes within a stub-like area.