ERouting_SBA_OSPF.pdf

Exploration Routing: OSPF Skills Based Assessment

Learning Objectives

Upon completion of this lab, you will be able to:

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 an ISP with multiple locations that are connected through a switch. You are

assigned the task of creating an addressing scheme for each client’s LAN. You must set the OSPF priorities

so that the ISP 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.

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

Interface

IP Address

Subnet Mask

ISP

Fa0/0

Lo0

Remote_1

Fa0/0

Lo0

Lo1

Remote_2

Fa0/0

Lo0

Lo1

Instructor’s Initial ______

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

Interface

IP Address

Subnet Mask

ISP

Fa0/0

10.10.10.1

255.255.255.248

Lo0

188.46.37.254

255.255.255.252

Remote_1

Fa0/0

10.10.10.3

255.255.255.248

Lo0

Lo1

Remote_2

Fa0/0

10.10.10.2

255.255.255.248

Lo0

Lo1

Step 3 Verify the configurations.

Instructor’s Initial ______

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. Do not advertise the

loopback interface on the ISP 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.

Instructor’s Initial ______

Task 4: Confirm OSPF Priorities.

Step 1: Verify the OSPF priorities.

Confirm that the DR/BDR election took place and that the Remote_2 router is the DR, Remote_1 is the

BDR and the ISP router is the DROTHER.

Step 2: Configure the ISP 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 ISP router is now the DR, the Remote_1 router is the BDR and the Remote_2 router is now

the DROTHER.

Instructor’s Initial ______

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 ISP WAN link to a value of 100.

Step 3: Verify the cost in the routing table.

Instructor’s Initial ______

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.

Instructor’s Initial ______

Task 7: Static Default Route

Step 1: Configure a static default route on the ISP 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.

Instructor’s Initial ______

Task 8: Verify Connectivity

Step 1 Ping the loopback interface on the ISP router from the Remote_1 and Remote_2 routers.

Instructor’s Initial ______

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