Juniper JN0-649 Exam Practice Questions (P. 5)

GPT-4o - Answer

In IS-IS, the use of areas and an autonomous system is rather specific. IS-IS divides the network into areas to streamline routing within a domain. Each router operates either at Level 1 within the same area to exchange routing information or at Level 2 to interconnect different areas. Importantly, Level 1 routers handle routes within their area, and Level 2 routers facilitate routing between areas. However, IS-IS does not function across different autonomous systems—this capability is more commonly associated with BGP. Thus, the focus in IS-IS lies on intra-domain routing with clear distinctions between area routing (Level 1) and the inter-area routing (Level 2) but not on autonomous system navigation.

GPT-4o - Answer

The correct sequence for BGP active route selection, particularly when BGP multipath and multihop are not configured, truly relies on traditional priority steps. Initially, it considers higher local preference as more preferred routes are favored. Subsequently, it examines the AS path, preferring the path with fewer AS hops. The origin type follows, where lower values are preferred (IGP over EGP and incomplete). If these parameters are identical, the decision moves to router IDs and peer addresses, opting for the lowest to break ties. Understanding these criteria is crucial for optimizing BGP efficiency and reliability in network operations.