Authentic Nokia Certification Exam 4A0-112 Questions Answers

The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from theInitializingstate to theUPstate occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.

TheCSNP (Complete Sequence Number PDU)packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from theDIS (Designated Intermediate System)that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.

In IPv6, the Neighbor Discovery Protocol (NDP) replaces the Address Resolution Protocol (ARP) used in IPv4. NDP is responsible for several functions, including resolving IP addresses to MAC addresses (similar to ARP), detecting duplicate IP addresses, and discovering other devices on the network.

The output shows two levels of IS-IS databases: Level 1 (L1) and Level 2 (L2). This indicates that the domain is multi-area, as L1 routers are confined to a single area, while L2 routers can route between different areas. The presence of Level 1/Level 2 (L1/L2) routers also suggests that the domain spans multiple areas.

The LSP (Link-State PDU) entries show L1/L2 ATT attributes, which typically indicate that these routers are capable of routing both within their own area (Level 1) and across areas (Level 2), suggesting a multi-area design.

The IS-IS domain likely includes broadcast interfaces, as indicated by the "ATT" attribute (typically referring to the type of interface) and common IS-IS configuration practices on broadcast networks like Ethernet.