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

• Configure OSPF authentication

• 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. Authentication must also be set so that a rouge router cannot connect to the network and propagate false routes into the network.

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	255.255.255.252
		Lo0	188.46.37.254	255.255.255.252
	Remote_1	Fa0/0	10.10.10.3	255.255.255.252
		Lo0
		Lo1
	Remote_2	Fa0/0	10.10.10.2	255.255.255.252
		Lo0
		Lo1

Step 3 Verify the configurations.

Instructor's Initial ______

Task 3: Basic OSPF Configuration.

Step 1 Configure OSPF on each router.

Use Process ID 1 and 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 ISP router is the DR, Remote_1 is the BDR and the Remote_2 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: Reload the switch 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 ______

Task 6: Configure OSPF Authentication

Step 1: Set md5 authentication between routers ISP - Remote_1

Step 2: Set md5 authentication between routers ISP - Remote_2

Step 3: Set md5 authentication between routers Remote_1 - Remote_2

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 ______

CCNA Exploration

Routing Protocols and Concepts Exploration Routing: OSPF Skills Based Assessment

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Remote_1

Remote_2

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