OSPF Multiaccess Networks Quiz
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Questions and Answers

DROTHERs use the multiaccess address 224.0.0.______ to send OSPF packets to the DR and BDR.

6

In the multiaccess topology, there are three routers interconnected over a common Ethernet multiaccess network, ______.

192.168.1.0/24

OSPF has automatically elected a ______ and BDR in multiaccess networks.

DR

R3 has been elected as the DR because its router ID is ______.

<p>3.3.3.3</p> Signup and view all the answers

R2 is the BDR because it has the second highest router ID, which is ______.

<p>2.2.2.2</p> Signup and view all the answers

To verify OSPF router roles, use the ______ command.

<p>show ip ospf interface</p> Signup and view all the answers

R1 is not the DR or BDR, but is a DROTHER with a default priority of ______.

<p>1</p> Signup and view all the answers

R1 has two adjacencies: one with the ______ and one with the DR.

<p>BDR</p> Signup and view all the answers

To verify the OSPFv2 adjacencies, use the show ip ospf ______ command.

<p>neighbor</p> Signup and view all the answers

The state of neighbors in multiaccess networks can be ______ such as FULL or DROTHER.

<p>classified</p> Signup and view all the answers

FULL/DROTHER indicates a DR or BDR router that is fully ______ with a non-DR or BDR router.

<p>adjacent</p> Signup and view all the answers

A router in the FULL/DR state is fully adjacent with the indicated ______ neighbor.

<p>DR</p> Signup and view all the answers

The normal state for an OSPF router is usually ______.

<p>FULL</p> Signup and view all the answers

In a 2-WAY state, a non-DR or BDR router can exchange ______ packets with another non-DR or BDR router.

<p>Hello</p> Signup and view all the answers

If a router is stuck in a state other than FULL, it is an indication that there are ______ in forming adjacencies.

<p>problems</p> Signup and view all the answers

The Backup Designated Router (BDR) can also be referred to by the ______ neighbor.

<p>ID</p> Signup and view all the answers

The ______ state is considered normal in a multiaccess broadcast network.

<p>2-WAY</p> Signup and view all the answers

In OSPF, the Internet Address for a router can be expressed as ______/24.

<p>192.168.1.3</p> Signup and view all the answers

The command 'show ip interface brief' is used to verify that the desired interfaces are active with correct ______.

<p>IP addressing</p> Signup and view all the answers

After configuring single-area OSPFv2, it is important to verify the ______.

<p>configurations</p> Signup and view all the answers

The command 'show ip route' is particularly useful for verifying that the routing ______ contains all the expected routes.

<p>table</p> Signup and view all the answers

To verify that OSPF is operating as expected, additional commands include 'show ip ospf ______'.

<p>neighbor</p> Signup and view all the answers

The command 'show ip ospf protocols' provides information about the OSPF ______.

<p>protocols</p> Signup and view all the answers

If a router's neighboring router is not displayed, the two routers have not formed an OSPFv2 ______.

<p>adjacency</p> Signup and view all the answers

The states of neighboring routers can be verified using the 'show ip ospf neighbor' command, where a router must be in the state of ______.

<p>FULL</p> Signup and view all the answers

To confirm communication between routers, you must check the ______ relationships formed by OSPF.

<p>neighbor</p> Signup and view all the answers

In OSPFv2, the command 'show ip ospf interface' shows the status of OSPF's ______.

<p>interfaces</p> Signup and view all the answers

The process of verifying OSPF configurations is essential to ensure proper ______ in the network.

<p>routing</p> Signup and view all the answers

To verify the OSPFv2 interface intervals, use the show ip ospf ______ command.

<p>interface</p> Signup and view all the answers

The router located between an OSPF routing domain and a non-OSPF network is called the ______.

<p>ASBR</p> Signup and view all the answers

To propagate a default route, the ASBR must be configured with a default static route using the ip route 0.0.0.0 0.0.0.0 ______ command.

<p>[next-hop-address | exit-intf]</p> Signup and view all the answers

Additional commands for determining that OSPF is operating as expected include: show ip ospf ______.

<p>neighbor</p> Signup and view all the answers

To modify the OSPFv2 Hello and Dead intervals manually, use the commands ip ospf hello-interval and ip ospf ______.

<p>dead-interval</p> Signup and view all the answers

To configure OSPF directly on the interface, use the ip ospf ______ configuration mode command.

<p>interface</p> Signup and view all the answers

The DR uses the multicast IPv4 address ______ which is meant for all OSPF routers.

<p>224.0.0.5</p> Signup and view all the answers

Only the DR and BDR listen for ______.

<p>224.0.0.6</p> Signup and view all the answers

To verify the roles of the OSPFv2 router, use the ______ command.

<p>show ip ospf interface</p> Signup and view all the answers

To verify the OSPFv2 ______, use the show ip ospf neighbor command.

<p>adjacencies</p> Signup and view all the answers

The OSPF DR and BDR election decision is based on the router with the highest interface ______ as the DR.

<p>priority</p> Signup and view all the answers

The router with the second highest interface priority is elected as the ______.

<p>BDR</p> Signup and view all the answers

If the interface priorities are equal, then the router with the highest ______ is elected the DR.

<p>router ID</p> Signup and view all the answers

The state of neighbors in multiaccess networks can be: FULL/DROTHER, FULL/______, FULL/BDR, or 2-WAY/DROTHER.

<p>DR</p> Signup and view all the answers

To stop transmitting routing messages through a router interface, use the ______ router configuration mode command.

<p>passive-interface</p> Signup and view all the answers

Study Notes

OSPF Multiaccess Networks

  • The multicast address 224.0.0.6 is used by DROTHERs to send OSPF packets to the Designated Router (DR) and Backup Designated Router (BDR).
  • Only DR and BDR routers listen for traffic on the address 224.0.0.6.
  • In a common Ethernet multiaccess network (192.168.1.0/24), OSPF automatically elects a DR and a BDR based on router IDs.

DR and BDR Election

  • Router R3 is elected as the DR with the highest router ID (3.3.3.3).
  • Router R2 is the BDR, having the second highest router ID (2.2.2.2).
  • To check the OSPF roles, the command show ip ospf interface displays the status of the routers.

Verifying OSPF Roles

  • R1, identified as a DROTHER, has a default priority of 1 and does not participate as a DR or BDR.
  • Adjacencies between routers are confirmed through output details, listing neighbor router IDs and their roles.

OSPF Neighbor States

  • OSPFv2 neighbor states in multiaccess networks include:
    • FULL/DROTHER: Fully adjacent with a DROTHER; can exchange OSPF data.
    • FULL/DR: Fully adjacent with the DR.
    • FULL/BDR: Fully adjacent with the BDR.
    • 2-WAY/DROTHER: Normal state for non-DR/BDR routers, indicates a Hello packet relationship.

Default Route Propagation

  • Default routes can be propagated in OSPF to ensure connectivity through the ASBR (Autonomous System Boundary Router).
  • Configuration requires establishing a default static route and utilizing the command default-information originate.

OSPF Verification Commands

  • To verify routing configurations, use:
    • show ip interface brief to check active interfaces.
    • show ip route to confirm routing table entries.
    • Additional commands:
      • show ip ospf neighbor for neighbor adjacency.
      • show ip ospf for general OSPF status.
      • show ip ospf interface for interface-specific details.

OSPF Configuration Commands

  • Key commands for OSPF configuration include:
    • router ospf process-id to enable OSPF.
    • network network-address wildcard-mask area area-id for area assignment.
    • Interface-specific commands like ip ospf hello-interval and ip ospf dead-interval to adjust timing.

Additional OSPF Concepts

  • OSPF uses a designated router to collect and distribute Link-State Advertisements (LSAs).
  • If the DR fails, the BDR assumes the DR role and the remaining routers become DROTHERs.
  • OSPF encourages efficient routing through the use of router priority and router IDs during the election process.
  • The interface type can be set to point-to-point using ip ospf network point-to-point, disabling the DR/BDR election in point-to-point topologies.

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Description

Test your understanding of the OSPF protocol in multiaccess networks. This quiz covers key concepts such as designated routers, multicast addresses, and OSPF packet transmission. Get ready to dive deep into network routing mechanisms!

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