OSPF Assessment
Exam Objectives
Completion of this exam requires the following tasks:
Create an addressing scheme to accommodate the hosts on the network
Cable network according to the diagram
Configure OSPF
Configure OSPF priorities
Configure OSPF cost
Verify OSPF operation
Configure a static default route
Scenario
You are a network engineer for a company with multiple locations that are connected through a switch. You
are assigned the task of creating an addressing scheme for each clients LAN. You must set the OSPF
priorities so that the HQ router is the DR and the Remote_1 router is the BDR. You must also make sure
that the Remote_2 router never takes part in the DR/BDR election.
All contents are Copyright 20072009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 1 of 4
CCNA Exploration
Routing Protocols and Concepts
Exploration Routing: OSPF Skills Based Assessment
Task 1: Create an Addressing Scheme.
Step 1: Create an addressing scheme for each LAN using the 192.168.1.0/24 address space.
Remote_1:
Lo0: 60 Hosts
Lo1: 12 Hosts
Remote_2:
Lo0: 62 Hosts
L01: 28 Hosts
Step 2: Record the appropriate subnet address and mask in Table 1.
Table 1
Device
HQ
Remote_1
Remote_2
Interface
Fa0/0
Lo0
Fa0/0
Lo0
Lo1
Fa0/0
Lo0
Lo1
IP Address
Subnet Mask
Task 2: Cable and Configure Network.
Step 1 Cable the network according to the Topology Diagram.
Step 2 Place the correct interface address for each router in Table 2.
Table 2
Device
HQ
Remote_1
Remote_2
Interface
Fa0/0
Lo0
Fa0/0
Lo0
Lo1
Fa0/0
Lo0
Lo1
IP Address
10.10.10.1
188.46.37.254
10.10.10.3
Subnet Mask
255.255.255.248
255.255.255.252
255.255.255.248
10.10.10.2
255.255.255.248
Step 3 Verify the configurations.
All contents are Copyright 20072009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 2 of 4
CCNA Exploration
Routing Protocols and Concepts
Exploration Routing: OSPF Skills Based Assessment
Task 3: Basic OSPF Configuration.
Step 1 Configure OSPF on each router.
Use Process ID 1and advertise all directly connected networks in OSPF Area 0. Advertise the loopback
interface on the HQ router.
Step 2 Verify the OSPF configuration.
Confirm that each router has formed an adjacency with one another and has a path to each network in the
topology.
Task 4: Confirm OSPF Priorities.
Step 1: Verify the OSPF priorities.
Confirm that the DR/BDR election took place and that the Remote_1 router is the DR, Remote_2 is the
BDR and the HQ router is the DROTHER.
Step 2: Configure the HQ router with the highest possible OSPF priority.
Step 3: Assure that the Remote_2 router will never take place in the DR/BDR election process.
Step 4: Reboot the switch using the reload command to force the OSPF election process.
Step 5: Verify that the OSPF election has occurred.
Confirm that the HQ router is now the DR, the Remote_1 router is the BDR and the Remote_2 router is now
the DROTHER.
Task 5: Configure OSPF Cost.
Step 1: Set the cost on the Remote_2 WAN link to a value of 1.
Step 2: Set the cost of the HQ WAN link to a value of 100.
Step 3: Verify the cost in the routing table.
All contents are Copyright 20072009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 3 of 4
CCNA Exploration
Routing Protocols and Concepts
Exploration Routing: OSPF Skills Based Assessment
Task 6: Verify OSPF Operation.
Step 1: Verify neighbor adjacencies.
Step 2: Verify that all networks are present in the routing table.
Task 7: Static Default Route
Step 1: Configure a static default route on the HQ router.
Step 2: Propagate the static default route to the other routers in the network.
Step 3: Verify that each router can see the static default route in their routing table.
Task 8: Verify Connectivity
Step 1 Ping the loopback interface on the HQ router from the Remote_1 and Remote_2 routers.
Task 9: Send in you packet tracer file to your instructor by email.
All contents are Copyright 20072009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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