A company requests that you consult with them regarding the design of their production, development, and test environments. They indicate that the environments must communicate effectively, but they m

IBGP operates within a single AS, so it would not provide the AS-level separation required to isolate failures between the three environments.

Each environment can be placed in its own BGP Autonomous System (AS), and EBGP sessions between them allow controlled route exchange with inbound and outbound policies. This AS-level separation prevents failures or route instability in the development network from directly propagating into the production environment. EBGP also supports granular filtering tools (route maps, prefix lists) that enforce the required isolation between environments.

OSPF floods link-state advertisements across the entire area, meaning a topology failure in the development network would directly affect OSPF convergence in production and test environments.

Static routes lack dynamic routing capabilities and administrative policy controls, making it difficult to enforce isolation or adapt automatically to topology changes across three environments.