Questions and Answers
The command ip ospf network point-to-point is used to enable the DR/BDR election process.
False
Loopback interfaces are advertised as /24 routes by default.
False
When a loopback interface is configured as a point-to-point network, it allows R2 to see the loopback advertised as a /24 route.
True
The command show ip ospf interface displays the network type of an OSPF interface.
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OSPF Point-to-Point Networks require a DR/BDR election to function properly.
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The output O 10.10.1.1/32 indicates that R2 is receiving a host route from R1's loopback interface.
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In OSPF configurations, Cost is an important factor that affects routing decisions.
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The interface command ip ospf network broadcast is often used with point-to-point networks.
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The default OSPF metric for a network path is 10.
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Manually setting the OSPF cost value can influence path selection.
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The command to check the OSPF cost for a specific network is 'show ip cost'.
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The OSPF metric for the path to the 10.10.2.0/24 network is 11.
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The distance value for OSPF is typically set to 120.
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The command to set OSPF cost on an interface must be entered in global configuration mode.
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OSPF can accumulate costs based on different formulas from various vendors.
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The 'traffic share count' indicates the number of equal-cost paths to a destination in OSPF.
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In OSPF, the loopback interface cannot have its cost set manually.
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The command 'ip ospf cost 10' sets the cost for the interface to 10 regardless of other settings.
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R1 is configured with the router ID 2.2.2.2.
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The router-id command is used to manually assign a router ID.
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A router ID can be changed without needing to reload the router.
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The command to verify the router ID is 'show ip protocols'.
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The router ID for R3 is 3.3.3.3.
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To see the new router ID take effect, the 'clear ip ospf process' command is not required.
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The output 'Router ID 10.10.1.1' indicates the current router ID for R1.
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The command to enter the router configuration mode begins with 'R1(config)#'.
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After clearing the OSPF process, neighbors are immediately reestablished.
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The command 'router ospf 10' is used to configure OSPF process number 10.
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The interface priority can only be configured to be a number between 0 and 255.
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A router configured with a priority value of 1 is eligible to become the DR or BDR.
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OSPF uses bandwidth as a metric, where a higher bandwidth indicates a better path.
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If the Dead interval expires, OSPF retains the neighbor in its link-state database (LSDB).
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FastEthernet, Gigabit Ethernet, and 10 GigE interfaces share the same OSPF cost value by default.
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The command 'show ip ospf neighbor' is used to verify OSPF adjacencies.
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If a router's ID is not displayed, it indicates that the routers are in a state of FULL.
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The command 'show ip route' verifies the status of OSPF neighbors.
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The routing table should exclude expected routes after configuring OSPFv2.
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Verifying OSPF protocol operation can be done with the command 'show ip ospf interface'.
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The command 'show ip interface brief' is not useful for verifying active interfaces in OSPFv2.
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A state of FULL indicates a successful OSPFv2 adjacency formation between routers.
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Configurations must be verified after configuring OSPFv2.
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There are only two commands that are useful for verifying routing in OSPFv2.
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OSPFv2 configurations do not require any further verification steps after completion.
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Study Notes
Point-to-Point OSPF Networks
- To convert an OSPF network to point-to-point, use
ip ospf network point-to-pointin interface configuration. - This action disables the Designated Router (DR) and Backup Designated Router (BDR) election process.
- Status change logs indicate neighbor changes; for example, a transition from FULL to DOWN indicates an interface issue.
Loopbacks and Point-to-Point Networks
- Loopback interfaces can serve multiple purposes and are advertised as /32 host routes by default.
- Configuring a loopback as point-to-point allows for advertising the full network instead of a single host.
- A change from /32 to /24 in route advertisement occurs when a loopback interface is configured as point-to-point.
Modify Single-Area OSPFv2
- OSPF accumulates cost metrics for routing paths; these can be viewed using
show ip route. - To influence path selection, manually setting OSPF cost with
ip ospf cost valueis possible. - This is useful for altering default behaviors in path selection or when connecting with non-Cisco equipment.
OSPF Router ID
- Manually assign router IDs using
router-id ridcommand, with router IDs being unique per router. - A router's ID can only be changed by reloading the router or resetting the OSPF process.
- Use
show ip protocolsto verify the active router ID after configuration changes.
Default Route Propagation
- Default routes can be propagated in OSPFv2 to enable routing to unknown destinations.
- Verification of single-area OSPF configuration includes connectivity tests and propagation checks.
Verify Single-Area OSPFv2
- Verify routing configurations using
show ip interface briefandshow ip routefor expected routes. - Additional commands such as
show ip ospf neighborandshow ip ospf interfacehelp confirm proper OSPF functioning. - A neighbor's state should be FULL to ensure successful adjacency formation.
OSPF Neighbors and Election Processes
- OSPF uses interface priority for DR/BDR elections, with values ranging from 0 to 255.
- A priority of 0 disallows DR/BDR eligibility; the default priority is 1 for multiaccess broadcast interfaces.
- OSPF calculates path cost based on a reference bandwidth formula, implying lower costs signal better paths.
OSPF Cost Manipulation
- OSPF costs can be adjusted for FastEthernet and Gigabit Ethernet to avoid sharing the same cost across different interfaces.
- Costs reflect accumulated values from the source router to the destination network, influencing route selection.
- If the Dead interval is exceeded without receiving a Hello packet, OSPF removes the neighbor from the link-state database (LSDB).
- Cisco default settings for the Dead interval are typically four times the Hello interval, ensuring robust neighbor detection.
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Description
This quiz covers the configuration of point-to-point OSPF networks in Cisco settings. It focuses on the command used to disable the DR/BDR election process and includes practical examples. Test your knowledge on OSPF settings and their impact on network topology.
