CCNA Discovery 4 Module 3 Exam Answers Version 4.0

CCNA Discovery 4 Module 3 Exam Answers Version 4.0

1.      It is important to identify the details of network sections and devices that will be affected or involved in a new design. This information is included in which section of the Network Design Requirements Document?  
• Project Goal 
• Project Scope         
• Technical Requirements      
• Current State of the Network

2.      Which two pieces of information does the network designer need to determine if the Cisco IOS of a router requires an upgrade? (Choose two.)  
• amount of NVRAM installed         
• model number of the router         
• number of interfaces and installed HWICs 
• installed Cisco IOS feature set and version         
• error statistics for each interface

3.      Which three pieces of information need to be considered when selecting the proper Cisco IOS version for an upgrade? (Choose three.)                   
• processor ID
• interface type           
• amount of DRAM • bootstrap version      
• device make and model     
• size of system flash memory

4.      What are two practices a network technician should follow when installing a new interface card in a router? (Choose two.)

• Be sure the interface card faceplate does not touch the chassis rear panel.
• Do not tighten the captive screws until the router has been powered on and recognizes the card.
• Store the blank faceplate inside the card slot to be used if the card is removed.   
• Handle the interface card by the edges to avoid static discharge.         
• Push the interface card into place until the edge connector is seated securely

5.      The new serial interface card for the router arrives and the network technician reads that it is hotswappable. What does this mean?
• The card cannot be installed while the router is powered on because static discharge could damage the card.    
• The card cannot be installed until the router is powered off and completely cooled down.
• The card can be installed while the router is powered on if the router supports this technology.
• The card is a replacement and must be installed in the same slot as the card it is replacing.

6.      Refer to the exhibit. A network administrator issues the command shown to gain knowledge about a poorly documented network. Which two pieces of information can the network administrator discover from the command output? (Choose two.)           
• One connected device has router capability.       
• The entire network contains a total of five Cisco devices with CDP enabled.       
• None of the directly connected network devices have been configured with an IP address.        
• Device EDGE_2811 is connected to port Fast Ethernet 0/0 on device C3750-24_MDF. 
• Five Cisco devices with CDP enabled are directly connected to device C3750-24_MDF

7.      Refer to the exhibit. Which of the three Cisco IOS images shown will load into RAM?       
• The router selects an image depending on the value of the configuration register.
• The router selects the third Cisco IOS image because it is the most recent IOS image.     
• The router selects the second Cisco IOS image because it is the smallest IOS image.       
• The router selects an image depending on the boot system command in the configuration.  
• The router selects the third Cisco IOS image because it contains the advipservicesk9 image.       

8.      An administrator wants to download a new Cisco IOS software version to the local router. Which command performs this task?     
• copy tftp flash        
• copy flash run          
• copy start tftp          
• copy flash tftp         
• copy tftp start

9.      Refer to the exhibit. The top of the output shows the Cisco Feature Navigator regarding a Cisco IOS image that the administrator wants to install on a router. Below it is the output from the show version command for that router. Which statement is true regarding the capacity of the router to run this Cisco IOS image? 
• There is not enough DRAM and flash.   
• There is enough DRAM and flash. 
• There is enough DRAM but not enough flash.       
• There is enough flash but not enough DRAM.

10.  Which two items are objectives of a WLAN design site survey? (Choose two.)
• identify coverage areas      
• determine primary AP locations  
• determine what AP equipment should be purchased          
• determine how many users will access the WLAN 
• identify the bottleneck of the LAN infrastructure

11.  Refer to the exhibit. Which two actions improve the weaknesses of the topology shown, assuming that each access layer segment is in its own subnet? (Choose two.)     
• Implement redundant links to each server by adding additional NICs.           
• Implement a reduntant link from all access layer switches to Admin, Dist, and Server Farm.
• Implement a backup firewall with a link to a secondary ISP and implement a redundant link to the DMZ.            
• Implement reduntant links from the existing firewall to all access layer switches.
• Implement redundant links from the DMZ to Admin and Dist.

12.   A company is beginning to analyze their new Cisco IOS upgrade requirements. What is one of the router components that a network administrator must consider when selecting a new Cisco IOS version?           
• processor type          
• storage space in NVRAM   
• interfaces and modules to be supported  
• compatibility of the bootstrap version with the new Cisco IOS software

13.  An employee at a company notices that the wireless signal strength indicator on his laptop fluctuates from good to low. The network administrator decides to do a site survey of that area. Which three factors need to be included in the survey? (Choose three.)
• type and model number of the WNIC of the laptop           
• number of users in the area          
• location of the AP  
• list of MAC addresses filtered by the AP   
• number of simultaneous applications running on the laptop of the employee        
• location of walls and filing cabinets in the office

14.  The new network design for AnyCompany must include support of voice and video traffic. Before upgrading, the network designer checks whether the existing devices can support the new requirements. Which three items does the designer need to check? (Choose three.)
• number of routers and switches owned by AnyCompany  
• routers that will support extra ASICs and WWICs
• size of DRAM and flash on each device  
• routers that will support HWICs and VWICs    
• system bootstrap version on each router and switch           
• modules supported on the loaded Cisco IOS

15.  A new Cisco IOS version has been copied into flash from a TFTP server. When a reload is issued to upgrade the Cisco IOS, the router freezes part of the way through the loading process. What could be the problem?   
• There is enough flash but not enough RAM in the router.       
• The new HWIC cards have not been installed yet. 
• The TFTP server needs to be present during a reload.        
• The new Cisco IOS should have been loaded into NVRAM.        
• The new bootstrap version is not compatible with the original version on the router.

16.  Refer to the exhibit. A network designer has no documentation and is attempting to create a logical diagram of the network using the output from show commands. What can be determined from the output shown?    
• The device with the ID of ISP is a router on the Internet. 
• The attached switch is a VTP server in the Toronto domain.         
• The designer cannot telnet to the attached switch.         
• The Cisco router IOS supports enterprise-level voice and video technologies.

17.  A production router is reloaded and finishes with a Router> prompt. What three facts can be determined? (Choose three.)           
• POST occurred normally.
• The boot process was interrupted.   
• There is not enough RAM or flash on this router.   
• A full version of the Cisco IOS was located and loaded.            
• A configuration file was not located in NVRAM or from a TFTP server.      
• The router did not locate the Cisco IOS in flash, so it defaulted to ROM.

18.  During a site survey, the network designer noticed that people were accessing the company wireless network from the parking lot. What should be done to stop the wireless signal from radiating out into the parking lot?     
• change the channel on the wireless AP       
• connect the wireless AP to a firewall          
• change the type of antenna attached to the AP  
• move the wireless AP to a secure VLAN   
• move the wireless AP to a port on a Layer 3 switch

19.  A network design project includes a review of the existing network. What is the purpose of this phase of the project?          
• eliminate the need for a site survey 
• shorten the timeframe of the project           
• lower the cost of the project by removing redundant links and devices     
• determine if the number of applications used within the company can be reduced           
• To determine what existing network devices require upgrades to meet the new

20.  Refer to the exhibit. Based upon the Cisco IOS file naming convention, what is represented by the value ipvoicek9 listed in the IOS filename?
• version         
• file format    
• feature set   
• hardware platform

21.  Refer to the exhibit. What two items can be determined from the output? (Choose two.)
• R2 is a Cisco 2600 device.
• R2 has 22 MB of RAM installed.   
• The version of the IOS is 12.3.      
• Over 8 MB of NVRAM is installed.           
• A new 36 MB IOS file can be installed on the device.

22.  During a wireless site survey, a consultant is determining the hours of peak usage and the estimated number of users in each location. The consultant is currently in what step of the site survey process? 
• the defining of customer requirements        
• the identification of coverage areas          
• the determining of preliminary AP locations          
• the measurement of signal strength

23.  Refer to the exhibit. The network administrator is attempting to install a new version of the IOS on R2. Based on the exhibited output, what are two possible reasons that the transfer failed?(Choose two.)       
• The administrator did not enable TFTP on R2.       
• There is not enough flash available to store the new IOS.  
• Connectivity between R2 and the TFTP server was not verified.        
• The copy command was incorrectly entered.          
• The administrator did not verify that the TFTP server is running.

24.  In which section of the Network Design Requirements document would a network consulting team detail names and IP addresses of important networking components and servers, provide network diagrams and topologies, and define strengths and weaknesses of the network?
• network requirements          
• project scope
• overall project goal  
• state of the network

CCNA 3 Lab 5.1.2.4 Designing and Creating a Redundant Network

Lab 5.1.2.4 Designing and Creating a Redundant Network

Step 1: Determine the minimum number of links to meet the requirements

1. Identify the two links to meet requirement 1.
2. Determine the cost of those two links.
3. Identify the required links to meet requirement 2, 3, and 4.
4. Determine if the design is within budget.

Step 2: Implement the design

1. Using Packet Tracer, create the network including the redundant links specified in Step 1.

Step 3: Verify the design

1. Do three paths between the east and west coast operations exist?
2. Does each site have at least two links?
3. Does each site on the east coast have two paths to the west coast?
4. Does each site on the west coast have two paths to the east coast?
5. Will one device failure affect multiple sites?

Reflection

1. What network topology was implemented before adding redundancy? Jawaban: Extended Star
2. What network topology is now implemented after adding redundancy? Jawaban: Partial Mesh
3. What is an advantage to using the topology implemented after adding redundancy? Jawaban: redundancy minimizes the impact that the failure of a single piece of equipment has on the operation of the network.
4. What is a disadvantage to using the topology implemented after redundancy was added? Jawaban: the increased cost of providing redundant links and equipment. Smaller companies may not be able to afford the cost.
5. Why would a company, such as the one in this case, suddenly decide to implement the type of topology used in step b? Jawaban: In this case, the company lost 16 hours of production and $600,000 to the company. No company wants to lose sales or time that causes a loss in profit to their company.

CCNA 3 Lab 5.2.3 Configuring RIPv2 with VLSM, and Default Route Propagation

Lab 5.2.3 Configuring RIPv2 with VLSM, and Default Route Propagation

Step 1: Connect the equipment.

a. Connect Router3 to Router1 and Router2 with serial cables.

b. Connect Router1’s Fa0/0 interface with a straight-through cable to Switch1’s Fa0/1 interface.

c. Connect Router2’s Fa0/0 interface with a straight-through cable to Switch2’s Fa0/1 interface

d. Connect PC1 to Switch1 and PC2 to Switch 2 with straight-through cables.

e. Connect PC3 to Router3’s Fa0/0 interface with a crossover cable.

f. Connect a PC with a console cable to perform configurations on the routers and switches.

Step 2: Perform basic configurations on the routers.

a. Establish a console session with Router1 and configure hostname, passwords, and interfaces as

described in the table. Save the configuration.

b. Establish a console session with Router2 and perform a similar configuration, using the addresses

and other information from the table. Save the configuration.

c. Establish a console session with Router3. Configure hostname, passwords, and interfaces according

to the table. Note that both serials are DCE on this router. Save the configuration.

Step 3: Perform basic configurations on the switches.

a. Establish a console session with Switch1 and configure hostname and passwords according to the

table. Save the configuration.

b. Perform a similar configuration on Switch2, configuring the hostname and passwords as described for

S1. Save the configuration.

Step 4: Configure the hosts with the proper IP address, subnet mask, and default gateway.

a. Configure each host with the proper IP address, subnet mask, and default gateway. Host1 should be

assigned 172.16.1.2/24 and Host 2 should be assigned 172.16.2.2 /24. Host3, which is used to

simulate Internet access, should be assigned 209.165.201.2/24. All three PCs use their attached

router’s Fa0/0 interface as the default gateway.

b. Each workstation should be able to ping the attached router. If the ping was not successful,

troubleshoot as necessary. Check and verify that the workstation has been assigned a specific IP

address and default gateway.

Step 5: Configure RIP v2 routing

a. On R1, configure RIP version 2 as the routing protocol and advertise the appropriate networks:

R1(config)#router rip

R1(config-router)#version 2

R1(config-router)#network 172.16.1.0

R1(config-router)#network 172.16.3.0

Predict: how will RIP report these subnets in the routing table? As a 172.16.0.0 summary route, as well as individual subnets of the 172.16.0.0 network.

b. From the network commands, which interfaces are participating in RIP routing? _____________

Fa0/0, S0/0/0.

c. Perform a similar configuration on R2, setting the version, advertising the appropriate networks, and

turning off auto-summarization

d. On R3, perform a similar configuration. Do not advertise the 209.165.201.0/24 network.

Step 6: Configure and redistribute a default route for Internet access.

a. From the R3 router to the host simulating the Internet, create a static route to network 0.0.0.0 0.0.0.0,

using the ip route command. This will forward any unknown-destination address traffic to the PC

simulating the Internet by setting a Gateway of Last Resort on the R3 router.

R3(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.2

b. R3 will advertise this route to the other routers if this command is added to its RIP configuration:

R3(config)#router rip

R3(config-router)#default-information originate

Step 7: Verify the routing configuration.

a. View the routing table on R3:

R3#show ip route

<<output omitted>>

Gateway of last resort is 209.165.201.2 to network 0.0.0.0

172.16.0.0/30 is subnetted, 4 subnets

R 172.16.1.0 [120/1] via 172.16.3.1, 00:00:17, Serial0/0/0

R 172.16.2.0 [120/1] via 172.16.3.5, 00:00:12, Serial0/0/1

C 172.16.3.0 is directly connected, Serial0/0/0

C 172.16.3.4 is directly connected, Serial0/0/1

C 209.165.201.0/24 is directly connected, FastEthernet0/0

S* 0.0.0.0/0 [1/0] via 209.165.201.2

How can you tell from the routing table that the subnetted network shared by R1, R2 and R3 has a

pathway for Internet traffic? Jawaban: There is a Gateway of Last Resort, and the default route shows up in the table.

b. View the routing tables on R2 and R1.

How is the pathway for Internet traffic provided in their routing tables? Jawban: There is a Gateway of Last Resort leading to R3, and the default route shows up as a distributed RIP

route.

Step 8: Verify connectivity.

a. Simulate sending traffic to the Internet by pinging from the host PCs to 209.165.201.2.

Were the pings successful? Jawaban: Ya.

b. Verify that hosts within the subnetted network can reach each other by pinging between Host1 and

Host2.

Were the pings successful? Jawaban: Ya.

Step 9: Reflection.

a. How did R1 and R2 learn the pathway to the Internet for this network? Jawaban: From RIP routing updates received from the router where the route was configured (R3).

Tugas CCNA 3 Lab 5.4.1.4 Implementing EIGRP

Lab 5.4.1.4 Implementing EIGRP
Step 1: Connect the equipment

1. Connect Router1 to Router2 and Router3 using serial cables.
2. Connect Router2 to Router3 using serial cables.
3. Connect a PC with a console cable to perform configurations on the routers.

Step 2: Perform basic configurations on the routers

1. Establish a console session with Router1 and configure hostname, passwords, and interfaces as described in the table. Save the configuration.
2. Establish a console session with Router2 and perform a similar configuration, using the addresses and other information from the table. Save the configuration.
3. Establish a console session with Router3. Configure hostname, passwords, and interfaces according to the table. Save the configuration.

Step 3: Configure EIGRP routing with default commands

1. On Gateway, configure EIGRP as the routing protocol with an autonomous system number of 100, and advertise the appropriate networks.

Gateway(config)#router eigrp 100
Gateway(config-router)#network 10.0.0.0
Gateway(config-router)#network 10.0.0.4
Predict: How will EIGRP report these subnets in the routing table?
Step 4: Configure MD5 Authentication

1. Create a keychain named discchain.
2. Configure a key 1 that has a key string of san-fran.
3. Enable the workgroup router to utilize EIGRP MD5 authentication with each of your EIGRP neighbors and to use the keychain icndchain.

Step 5: Reflection

1. What is the importance of enabling authentication on the routing updates?

Step 1: Connect the equipment

1. Connect Router1 to Router2 and Router3 using serial cables.
2. Connect Router2 to Router3 using serial cables.
3. Connect a PC with a console cable to perform configurations on the routers.

Step 2: Perform basic configurations on the routers

1. Establish a console session with Router1 and configure hostname, passwords, and interfaces as described in the table. Save the configuration.
2. Establish a console session with Router2 and perform a similar configuration, using the addresses and other information from the table. Save the configuration.
3. Establish a console session with Router3. Configure hostname, passwords, and interfaces according to the table. Save the configuration.

Step 3: Configure EIGRP routing with default commands

1. On Gateway, configure EIGRP as the routing protocol with an autonomous system number of 100, and advertise the appropriate networks.

Gateway(config)#router eigrp 100

Gateway(config-router)#network 10.0.0.0

Gateway(config-router)#network 10.0.0.4

Predict: How will EIGRP report these subnets in the routing table?

Step 4: Configure MD5 Authentication

1. Create a keychain named discchain.
2. Configure a key 1 that has a key string of san-fran.
3. Enable the workgroup router to utilize EIGRP MD5 authentication with each of your EIGRP neighbors and to use the keychain icndchain.

Step 5: Reflection

1. What is the importance of enabling authentication on the routing updates?

Tugas CCNA 3 Lab 5.4.2.4 EIGRP Configuring Automatic and Manual Route Summarization and Discontiguous Subnets

Lab 5.4.2.4 EIGRP Configuring Automatic and Manual Route Summarization and Discontiguous Subnets

Step 1: Connect the equipment

1. Connect Router1 to Router2 and Router3 using serial cables.
2. Connect Router2 to Router3 using serial cables.
3. Connect a PC with a console cable to perform configurations on the routers.

Step 2: Perform basic configurations on the routers

1. Establish a console session with Router1 and configure hostname, passwords, and interfaces as described in the table. Save the configuration.
2. Establish a console session with Router2 and perform a similar configuration, using the addresses and other information from the table. Save the configuration.
3. Establish a console session with Router3. Configure hostname, passwords, and interfaces according to the table. Save the configuration.

Step 3: Configure EIGRP routing with default commands

1. On Gateway, configure EIGRP as the routing protocol with an autonomous system number of 100, and advertise the appropriate networks.
2. On Branch1, configure EIGRP as the routing protocol with an autonomous system number of 100, and advertise the appropriate networks:
3. Perform a similar configuration on Branch2, using EIGRP 100 and advertising the appropriate networks.

Step 4: Verify the routing configuration

1. View the routing table on Gateway.
2. Which subnets are not reported in this output? Jawaban: The subnets configured for the 172.16.0.0 and 172.17.0.0 networks are absent.
3. Why are there two paths reported for the 10.0.0.8/30 route? Jawaban: Because no bandwidth commands have been configured, EIGRP has two equal-cost paths to report.

Step 5: Remove Automatic summarization

On each of the three routers, remove automatic summarization to force EIGRP to report all subnets. A sample command is given for Gateway.

Step 6: Verify the routing configuration

View the routing table again on Gateway.

Step 7: Configure manual summarization

On Branch2, configure manual summarization to force EIGRP to summarize only the 172.17.0.0 subnets.

Step 8: Reflection

1. Although removing automatic summarization solved the issue of missing subnets, what possible problem could it cause? Jawaban: The routing table is very long, and that will slow down the lookup process.
2. How could removing automatic summarization help in troubleshooting an EIGRP network? Jawaban: Checking the output against all possible subnets will reveal which subnet(s) are missing. Those are the connections and configurations that need to be checked.

How did the use of loopback interfaces make this lab easier to complete? Jawaban: Less equipment required, less time to set up and cable equipment.

Tugas CCNA 3 Lab 6.2.4 Part A: Configuring and Verifying Point-to-Point OSPF

Lab 6.2.4 Part A: Configuring and Verifying Point-to-Point OSPF

Step 1: Connect the equipment

1. Connect the Fa0/0 interface of each router to the Fa0/1 interface of each switch using a straightthrough cable.
2. Connect each host to the Fa0/2 switch port of each switch using a straight-through cable.
3. Connect serial cables from each router to the other router as shown in the topology.

Step 2: Perform basic configurations on the routers

1. Connect a PC to the console port of the router to perform configurations using a terminal emulation program.
2. On all routers, configure the hostname, passwords, and message-of-the-day banner and disable DNS lookups according to the addressing table and topology diagram.

Step 3: Configure the router interfaces

Step 4: Verify IP addressing and interfaces

1. Use the show ip interface brief or the show protocols command to verify that the IP addressing is correct and that the interfaces are active.
2. After all interfaces are verified, be sure to save the running configuration to the NVRAM of the router.

Step 5: Configure Ethernet interfaces of PC1, PC2, and PC3

1. Configure the Ethernet interfaces of PC1, PC2, and PC3 with the IP addresses and default gateways from the addressing table.
2. Test the PC configuration by pinging the default gateway from each PC.

Step 6: Configure OSPF on Router 1

1. Configure OSPF on the R1 router. Enter a process ID of 1 for the process-ID parameter. R1(config)#router ospf 1
2. Configure the network statement for the LAN. When you are in the Router OSPF configuration submode, configure the LAN 172.16.1.16/28 to be included in the OSPF updates that are sent out of R1. Use an area ID of 0 for the OSPF area-id parameter. Zero will be used for the OSPF area ID in all network statements in this topology.

R1(config-router)#network 172.16.1.16 0.0.0.15 area 0

1. Configure the router to advertise the 192.168.10.0/30 network attached to the Serial 0/0/0 interface.

R1(config-router)#network 192.168.10.0 0.0.0.3 area 0

1. Configure the router to advertise the 192.168.10.4/30 network attached to the Serial 0/0/1 interface. R1(config-router)#network 192.168.10.4 0.0.0.3 area 0
2. Return to privileged EXEC mode and save the configuration.

Step 7: Configure OSPF on the R2 router

1. Enable OSPF routing on the R2 router using the router ospf command. Use a process ID of 1.

R2(config)#router ospf 1

1. Configure the router to advertise the LAN network 10.10.10.0/24 in the OSPF updates.

R2(config-router)#network 10.10.10.0 0.0.0.255 area 0

Step 8: Configure OSPF on the R3 router

Configure OSPF on the R3 router using the router ospf and network commands. Use a process ID of 1. Configure the router to advertise the three directly connected networks. When you are finished, return to privileged EXEC mode.

Step 9: Configure OSPF router IDs

1. The OSPF router ID is used to uniquely identify the router in the OSPF routing domain. A router ID is an IP address. Cisco routers derive the router ID in one of three ways, and with the following precedence:
2. Examine the current router IDs in the topology.
3. The router ID can also be seen in the output of the show ip protocols, show ip ospf, and show ip ospf interfaces commands.

Step 10: Verify OSPF operation

1. On the R1 router, use the show ip ospf neighbor command to view the information about the
2. On the R1 router, use the show ip protocols command to view information about the routing protocol operation.

Step 11: Examine OSPF routes in the routing tables

View the routing table on the R1 router. OSPF routes are denoted in the routing table with an O.

Step 12: Configure OSPF cost

1. Use the show ip route command on the R1 router to view the OSPF cost to reach the 10.10.10.0/24 network.
2. Use the show interfaces serial0/0/0 command on the R1 router to view the bandwidth of the Serial 0/0/0 interface.

Step 13: Reflection

What are some advantages of using OSPF as a routing protocol? Jawaban: supports VLSM and CIDR, uses cost metrics to choose the best path, and each router has a complete picture of the entire network.

Tugas CCNA 3 Lab 6.2.4 Part B: Configuring and Verifying Multi-access OSPF

Lab 6.2.4 Part B: Configuring and Verifying Multi-access OSPF

Step 1: Connect the equipment

Connect the Fa0/0 interface of each router to the switch using a straight-through cable. Three routers are sharing a common Ethernet multi-access network, 192.168.1.0/24. Each router will be configured with an IP address on the FastEthernet interface and a loopback address for the router ID.

Step 2: Perform basic configurations on the routers

Step 3: Configure and activate Ethernet and Loopback addresses

Step 4: Verify IP addressing and interfaces

1. Use the show ip interface brief or the show protocols command to verify that the IP addressing is correct and that the interfaces are active.
2. After all interfaces are verified, be sure to save the running configuration to the NVRAM of the router.

Step 5: Configure OSPF on the DR router

The DR and BDR election process takes place as soon as the first router has its interface enabled for OSPF on the multi-access network. If OSPF is already configured for an interface, this can happen as the routers are powered on.

Step 6: Configure OSPF on the BDR router

1. Configure the OSPF process on the router with the second highest router ID to ensure that this router becomes the BDR. Use the router ospf command in global configuration mode to enable OSPF on the R2 router.  What console message was displayed as a result of the OSPF commands on R2 and what does this mean? Jawaban: An OSPF adjacency message displayed indicating an adjacency was formed with the R3 router (Nbr 192,168.31.33). When the hello packet is received, the neighbor relationship is formed.

00:08:51: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.31.33 on

FastEthernet0/0 from LOADING to FULL, Loading Done

1. Use the show ip ospf interface command to verify that the OSPF has been configured correctly and that R2 is the BDR.

Step 7: Configure OSPF on the DRother router

1. Configure the OSPF process on the router with the lowest router ID last. This router will be designated as DRother instead of DR or BDR. Use the router ospf command in global configuration mode to enable OSPF on the R1 router
2. Use the show ip ospf interface command to verify that the OSPF has been configured correctly and that R1 is a DRother.

Step 8: Use the OSPF priority to determine the DR and BDR

1. Use the ip ospf priority interface command to change the OSPF priority of the R1 router to 255. This is the highest possible priority.
2. Use the ip ospf priority interface command to change the OSPF priority of the R3 router to 100.
3. Use the ip ospf priority interface command to change the OSPF priority of the R2 router to 0. A priority of 0 causes the router to be ineligible to participate in an OSPF election and become a DR or BDR.
4. Shut down and re-enable the FastEthernet0/0 interfaces to force an OSPF election. As the interfaces are shut down, the OSPF adjacencies are lost.

Step 9: Reflection

1. When the OSPF process starts, what happens if there is no active interface on the router? Jawaban: OSPF will not start.
2. What can be done to ensure there will be an active interface on a router? Jawaban: Configure a loopback interface.
3. How are the DR and BDR elected in an OSPF network? Jawaban: The DR is chosen with the highest OSPF priority value. The BDR is chosen with the second highest priority value. If the priority is the same, the OSPF election for DR is decided on the highest Router ID.
4. What OSPF interface priority value prevents a router from being elected as a DR? jawaban: 0