ccna 200 301 syllabus examples/templates for certificates

ccna 200 301 syllabus examples/templates for certificates.The Router ID (RID) is an IP address that identifies the router and can be specified manually during the OSPF routing process; if not specified, the router selects the highest of all loopback interfaces.If not specified, the router selects the highest IP address of all loopback interfaces as the Router ID; if no loopback interface is used, the router selects the highest IP address of all active physical interfaces as the Router IDO4. NeighborTwo or more routers connected to a common network, such as two routers connected by a serial interface or multiple routers connected by an Ethernet interface.Adjacency is a relationship between two routers that allows direct exchange of routing update data. OSPF only shares routing information with neighbors that have established an adjacency relationship.neighbors to share routing information. Not all neighbors can be neighbors, it depends on the type of network and the configuration of the routers; not all routers with an adjacency are neighbors, CCNP will involve virtual circuits, two routers are not directly connected, they can also share routing information.6.Area OSPF implements hierarchical design by dividing areas. OSPF is divided into areas by links. In Figure 8-2-1, routers within the same AS (autonomous system) are divided into three OSPF areas. routers R2 and R3 span two areas, and they are called ABRs (AreaBorderRouter). All areas are connected to Area 0. Area. known as the backbone area. the backbone area router has all the routing entries for the entire AS and has relatively high configuration requirements for the router. The other areas can be standard areas or some special areas that can contain only some of the routes within the AS and have relatively low configuration requirements for the routers. By dividing the area, the LSA proliferation is restricted to the area, which in turn can reduce the number ofrouting table entry within the area, and also limit the impact of topology changes within the area to this area. Only single-area OSPF is covered in the CCNA, while multiarea OSPF is covered in the CCNP section.Figure 8-2" Multi-area OSPF7. DesignatedRouter (DR) When an OSPF router is connected to a multi-access network, a Designated Router (DR) needs to be selected,