What is required for OSPF to establish a neighbor adjacency?

To establish OSPF full adjacency, two neighbor routers must be in the same area. Any individual interface can only be attached to a single area. If the address ranges specified for different areas overlap, IOS will adopt the first area in the network command list and ignore subsequent overlapping portions.

Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2?

99 Cards in this Set
What is one reason to use the ip ospf priority command when the OSPF routing protocol is in use? to influence the DR/BDR election process
Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2? OSPFv2 type of network, hello timer, subnet mask

What is required for two routers participating in OSPF before they can form a neighbor adjacency?

The following conditions must be met for two routers to become neighbors: They must have the same IP network/subnet. The Hello and deceased Interval timers must be identical. Router interfaces connecting two routers must have the same Area ID.

What is the first criteria that is used by the OSPF routers to select the best route to be installed in the routing table?

The route with the lowest value for cost is chosen as the best route. If there are multiple routes to a network with the same route type and cost, it chooses all the routes to be installed in the routing table, and the router does equal cost load balancing across multiple paths.

Which three parameters should match in order for a pair of routers?

For a couple of routers that are running OSPFv2 to form an adjacency, the following parameters must match: subnet mask, network type, hello and deceased timers, a corresponding network command, and the authentication information.

Which two parameters must match between neighboring OSPF routers in order to form an adjacency choose two?

Answers Explanation & Hints:

Several variables must match for an OSPF neighbor adjacency to be formed between two OSPF routers. These variables include: area ID, hello and deceased timers, interface MTU, and interface subnet.

Which of the following must match in order for an adjacency to occur between routers?

For two OSPF routers to form an adjacency, they must be in the same area, must be in the same subnet, and must have authentication information match, if configured.

How do you prioritize OSPF routes?

Setting a Priority for OSPF Routes
  1. Run system-view. The system view is displayed.
  2. Run ospf [ process-id ] The OSPF process view is displayed.
  3. Run preference [ ase ] { preference | route-policy route-policy-name } * A priority is set for OSPF routes. The parameter ase specifies a priority for AS external routes.

What is the order of preference for choosing the router ID of an OSPF router?

Cisco routers determine the OSPF router ID based on the preferential order of configured router ID, IPv4 addresses of loopback interfaces, and IPv4 addresses of active physical interfaces.

What is an adjacency in OSPF quizlet?

Adjacency database – Creates the neighbor table. Link-state database (LSDB) – Creates the topology table. Forwarding database – Creates the routing table. These tables contain a list of neighboring routers to exchange routing information with and are kept and maintained in RAM.

What type of LSAs are sent by an Asbr?

Type 5 – External LSA: also known as autonomous system external LSA: The external LSAs are generated by the ASBR.

On what type of OSPF router is Interarea route summarization configured?

Inter-Area route summarization can only be done on the Area Boarder Router (ABR) and summarize routes from a particular area into the backbone area. External Route summarization can only be done on an ASBR and summarizes routes to an external destination.

Which OSPF packet type is used to establish and maintain adjacency with other OSPF routers?

Type 1: Hello packet –
OSPF Messages

Type 1: Hello packet – Used to establish and maintain adjacency with other OSPF routers.

What will an OSPF router prefer to use first as a router ID?

The first preference for an OSPF router ID is an explicitly configured 32-bit address. This address is not included in the routing table and is not defined by the network command.

Which of the following OSPF packets is used by routers to request more information?

A Type 3 LSR packet is used by the receiving routers to request more information about an entry in the DBD. The Type 4 LSU packet is used to reply to an LSR packet. A Type 5 packet is used to acknowledge the receipt of a Type 4 LSU. LSUs are also used to forward OSPF routing updates, such as link changes.

Which of the following packet types are OSPF packets?

There are 5 Types of OSPF packets:
  • The Hello Packet : …
  • The Database Description Packet : …
  • The Link State Request packet : …
  • The Link State Update packets: …
  • The Link State Acknowledge packets:

Which of the following is OSPF packet?

Explanation: The five types of OSPF packets are: Hello, Database description, Link-state request, Link-state update, and Link-state ACK.

What packet types does OSPF support?

Packet types for OSPF
  • Hello packet. This packet is sent by the OMPROUTED server to discover OSPF neighbor routers and to establish bidirectional communications with them. …
  • Database description packet. …
  • Link-state update packet. …
  • Link-state request packet. …
  • Link-state acknowledgment packet.