Terms : Hide Images
| 8721773502 | 1. AD = 110 2. Classless - supports VLSM & CIDR 3. Efficient - routing changes trigger routing updates 4. Fast Convergence 5. Scalable 6. Secure - supports MD5 7. Dijkstra Algorithm chooses best path | What are the 7 features of OSPF? | 0 | |
| 8721778310 | 1. Adjacency - neighbor table 2. Link-state (LSDB) - topology table 3. Forwarding - routing table | What 3 databases does OSPF create and keep in RAM? | 1 | |
| 8721784481 | 1. Establish Neighbor Adjacencies - hello packets are sent out all OSPF-enabled interfaces 2. Exchange Link-State Advertisements (LSAs) - routers flood LSAs to adjacent routers which contain the state, cost, and sequence # of each directly connected link 3. Build the Topology Table - based on the LSAs a router receives - eventually holds all info about networks topology 4. Execute the SPF Algorithm - which then creates the SPF tree | To reach a state of convergence, what 4 steps does OSPF complete? | 2 | |
| 8721795064 | 1. it lightens the load on routers 2. all areas must connect to the backbone (0) area 3. interconnecting routers are called Area Border Routers (ABRs). | A Multi-area OSPF is used in larger networks to dived a large AS (autonomous system) into smaller areas. What are 3 characteristics of a multi-area OSPF? | 3 | |
| 8721804520 | 1. smaller routing tables because network addresses can be summarized between areas 2. reduced link-state update overhead - uses less processing and memory 3. reduced frequency of SPF calculation - LSA flooding stops at the area boundary 4. link failure affects only the local area | What are 4 advantages of Multi-area OSPFs? | 4 | |
| 8721807957 | 1. discover OSPF neighbors & establish adjacencies 2. advertise parameters on which 2 routers must agree to become neighbors 3. elect designated router (DR) & backup designated router (BDR) on multiaccess networks like Ethernet & Frame Relay | List 3 things the OSPF Hello Packet is used for? | 5 | |
| 8721813647 | * Create adjacencies with neighbors * Exchange routing information * Calculate the best routes * Reach convergence | What 4 steps does an OSPF attempt to do when initially connected to a network? | 6 | |
| 8721816811 | * down state * Init state * two-way state * exStart state * exchange state * loading state * full state | While attempting to reach convergence, what 7 states does OSPF go thru? | 7 | |
| 8721823699 | 1. configure router-id command 2. router chooses highest IPv4 address of any configured lookback interfaces 3. if no loopback interfaces are configured, router chooses the highest active IPv4 address of any of its physical interfaces - least recommended | How does the router determine its router ID? | 8 | |
| 8721830090 | 1. subnets don't match - different network 2. OSPF Hello or Dead timers don't match 3. OSPF Network Types don't match 4. Missing or incorrect OSPF network command | What 4 conditions prevent 2 routers from forming an OSPF adjacency? | 9 |
