9tut questions ccna

9tut questions ccna.Router LSA 1 Describes the router RID, interface, IP address/mask, current interface statusNetwork 2 Describes a network with a DR DR and BDR IP address, subnet ID, maskAggregate 3 Describes the subnet in another area Subnet ID, mask, RID of the ABR that advertises the LSATip: In some networks, OSPF and other routing protocols are used simultaneously. In this case, one or more routers run both OSPF and other routing protocols, and these routers act as OSPF Autonomous System BorderRouter (ASBR) ,redistributing routing information between OSPF and the other routing protocols. In this case, the ASBR creates a type 4 LSA (which describes the ASBR itself) and a type 5 LSA for each external route learned from the other routing protocols, and then advertises them into the OSPF.Router LSAs build most of the intra-area topologyOSPF requires very detailed topology information within each area. Routers within region X need to know all the details of the topology within region X. The mechanism for providing routers with all of these details allows routers to create and flood router (type 1) and network (type 2) LSAs for routers and links in that region.The router LSA, also known as a Type 1 LSA, describes the router in detail. It lists the router's RID, interface, IPv4 address and mask, interface status, and notes what the router knows about its neighbors from its interface. For a particular example, first look at Figure 8-9, which lists the topology of an interconnected network and lists the subnets. As a small interconnected network, the engineer chose a single-area design, with all interfaces in backbone area 0. Area 0Figure 8-9 Enterprise Network with 7 IPv4 SubnetsThe LSDB will contain 4 router LSAs. each router creates a router LSA for itself, using its own RID as the LSA identifier. the LSA lists the router's own interface, IP address/mask, and a pointer to its neighbors.Once all four routers have all four router LSAs, SPF can mathematically analyze the LSAs to create a model.