Single-Area OSPF 1

It is a link-state routing protocol that was developed as a replacement for the
distance vector routing protocol, RIP.

It is RIP's metric for determining the best route quickly.

T or F: Using hop count does not scale well in larger networks with multiple paths of varying speeds.

T or F: An advantage of OSPF is having faster convergence and scales to much larger network implementations.

OSPF is a _____ routing protocol that uses the concept of areas for ______.

What are the characteristics of OSPF?

OSPF v3 for IPv6 currently published in _____.

Supports VLSM and CIDR.

Routing changes trigger routing updates. It uses the SPF algorithm to choose the best path.

T or F: OSPF has periodic updates.

It is the algorithm used by OSPF to choose its best path.

It quickly propagates network changes.

It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

Routers can be grouped into _____ to support a _____.

It supports Message
Digest 5 (MD5) authentication.
When enabled, OSPF routers only
accept encrypted routing updates
from peers with the same pre-shared password.

Authentication supported by OSPF.

T or F: With Message Digest 5, routers can also accept routing updates that are not encrypted.

What is the administrative distance for OSPF?

What are the components of OSPF?

OSPF's data structures consists of ____, ____, and ____.

Creates the neighbor table.

Creates the topology table.

Creates the routing table.

These are [the Routing Protocol Messages] used to discover neighboring routers and also to exchange routing information to maintain accurate information about the network.

The SPF algorithm is based on the _____ to reach a destination.

The SPF algorithm creates an ____.

OSPF places the best routes into the ___, which is used to make the ____.

It is a list of all neighbor routers to which a router has established bidirectional communication.

T or F: The Neighbor Table is unique for each router.

Command to view the neighbor table.

Lists information about all other routers in the network.

It represents the network topology.

T or F: All routers within an area have different Link-state Database (LDSB).

Command to view the topology table.

List of routes generated when an algorithm is run on the link-state database.

T or F: Each router's routing table is unique.

Command to view the routing table.

Area 0 is called the ____.

Interconnecting routers are called ____.

T or F: Single-Area OSPF is useful in smaller networks with few routers.

OSPF messages are transmitted over a/an ____.

OSPF messages contain the following:

OSPF uses ____ to establish and maintain neighbor adjacencies and exchange routing updates.

Used to establish and maintain adjacency with other OSPF routers.

Contains the abbreviated list of the sending router's LDSB.

Used by the receiving routers to request more information about an entry in the DBD.

Used to reply to LSRs and to announce new information.

This is sent to confirm receipt of the LSU.

T or F: the LSAck data field is empty.

Used to discover OSPF neighbors and establish neighbor adjacencies.

Hello packets elect the ____ and ____ on ____ networks like Ethernet and Frame Relay.

T or F: Point-to-point links require DR or BDR.

It is a 32-bit value expressed in dotted decimal notation (an IPv4 address) used to uniquely identifying the originating router.

Subnet mask associated with the sending interface.

Area from which the packet originated.

Specifies the frequency, in seconds, at which a router sends Hello packets.

The default Hello interval on multiaccess and point-to-point networks is ____.

It is used in a DR/ BDR election.

What is the default priority for all OSPF routers?

T or F: The lower the value, the more likely the router becomes the DR on the link.

It is the time in seconds that a router awaits to hear from a neighbor before declaring the neighboring router out of service.

What is the default Dead Interval?

What is the default Hello interval on nonbroadcast multiaccess [NBMA] networks; Frame Relay.

T or F: If the Dead interval expires before the routers receive a Hello packet, OSPF removes that neighbor from its LSDB.

T or F: The router floods the LSDB with information about the down neighbor out all OSPF-enabled interfaces.

What is the default Dead interval for multiaccess and point-to-point networks?

What is the default Dead interval for NBMA networks?

State where no Hello packets are received. Router sends Hello packets.

State where Hello packets are received from the neighbor.

State where electing a DR and BDR happen on Ethernet links.

State where negotiation of master/ slave relationship and dbd packet sequence number happen.

State where routers exchange DBD packets.

State where LSRs and LSUs are used to gain additional router information. Routers are processed using the SPF algorithm.

The ____ initiates the DBD packet exchange.

State where routers have converged.

T or F: More routers = more adjacencies

OSPFv2 is enabled using which commandin the global configuration mode?

The process-id value is ranged between?

Recommended method (command) to assign a router ID.

T or F: If the router ID is not explicitly configured, the router chooses the highest IPv4 address of any of configured loopback interfaces.

T or F: If no loopback interfaces are configured, then the router chooses the highest inactive IPv4 address of any of its physical interfaces.

A router ID can also be assigned using a _____.

T or F: A 32-bit host route gets advertised as a route to other OSPF routers.

The basic command syntax for enabling OSPF on interfaces is?

OSPF metric is ___.

T or F: Higher bandwidth = Lower cost

T or F: The cost of an interface is inversely proportional to the bandwidth of the interface.

What is the default reference bandwidth?

OSPF cost formula is:

T or F: When adjusting the reference bandwidth, the command must be configured on every router in the OSPF domain.

T or F: The bandwidth must be adjusted at each end of the serial links.

This command is a quick way to verify vital OSPF configuration information.

This command is used to verify OSPF Process Information.

It is the OSPFv2 equivalent for exchanging IPv6 prefixes.

What OSPFv3 feature supports both IPv4 and IPv6?

T or F: IPv6 and IPv4 routing protocols are basically the same and run dependently with each other.

T or F: OSPFv2 and OSPFv3 each have separate adjacency tables, OSPF topology tables, and IP routing tables.

Source/ Destination address for OSPFv3.

Authentication used for OSPFv3.

T or F: IPv6 unicast forwarding is enabled by default.

____ are automatically created when an IPv6 global unicast address is assigned to the interface.