Lab 5.3.5.4 – Configure Serial and Ethernet Interfaces
Open Packet Tracer Activity 5.3.5.4 Use these instructions to complete the lab.
Be sure to answer all questions.
When done, click the Check Results button to verify your results,
and turn in this paper.
Objective
Configure serial and Ethernet interfaces on a Cisco 1841 router.
Background / Preparation
In this Packet Tracer lab, you will configure the LAN Ethernet interface and the WAN
Serial interface with the following settings on the customer Cisco 1841 router:
Step 1: Configure the LAN Ethernet interface.
1. Use the terminal emulation software on the Customer PC to connect to the
Cisco 1841 customer router. Enter the console password.
2. Enter the privileged EXEC mode. The CustomerRouter# router prompt shows
that you are at the privileged EXEC mode. Enter the privileged Exec
password.
3. Enter the global configuration mode. The CustomerRouter(config)# router
prompt shows that you are at the global configuration mode.
4. Identify which interface you are going to configure. For example, if you are
configuring the FastEthernet interface, use this command:
CustomerRouter(config)#interface fastEthernet 0/0.
5. Describe the interface with the following command:
CustomerRouter(config-if)#description Connected to CustomerSwitch.
6. Specify the IP address and subnet mask by use this command:
CustomerRouter(config-if)#ip address 192.168.1.1 255.255.255.0.
7. Ensure that the interface is enabled by use this command:
CustomerRouter(config-if)#no shutdown.
8. End interface configuration mode by use this command:
CustomerRouter(config-if)#end.
Step 2: Verify your LAN interface configuration.
1. Use the show ip route command to verify your configuration. This is a
partial example of what you should see:
CustomerRouter#show ip route
...
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, FastEthernet0/0
Step 3: Configure the WAN serial interface.
1. Refer to the Sub-steps of Step1 to configure the WAN serial interface on the
customer router. Tip: Remember the Cisco IOS CLI Help commands to
configuration the interface more quickly. You can also refer back to your
lesson.
2. Enter the global configuration mode.
3. Identify the serial interface that you are configuring.
4. Describe the interface. (Connected to ISP)
5. Specify the interface's IP address and subnet mask. (209.165.200.225
255.255.255.224)
6. Ensure that the interface is enabled.
7. End interface configuration mode.
Step 4: Verify your LAN and WAN interface configurations.
1. Use the show run command to verify your configuration. This is a partial
example of the output:
CustomerRouter#show run
...
!
interface FastEthernet0/0
description Connected to CustomerSwitch
ip address 192.168.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/1/0
description Connected to ISP
ip address 209.165.200.225 255.255.255.224
!
1. Use the ping command to verify connectivity to the WAN interface on the ISP
router. This is a partial example of the output:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 209.165.200.225, timeout
is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max
= 44/51/65 ms
2. Use the ping command to verify connectivity to the customer switch. This is
a partial example of the output:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is
2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max
= 1/7/20 ms
Step 5: Save your configuration.
1. In privileged EXEC mode, save the running configuration to the startup
configuration, use this command:
CustomerRouter#copy run start.
Reflection
1. When you ping the LAN IP address of the ISP router, what happens and why?
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2. Which Cisco ISO CLI mode do you need to be in to configure the description of
an interface?
a. CustomerRouter#
b. CustomerRouter>
c. CustomerRouter(config)#
d. CustomerRouter(config-if)#
3. You configured the Fast Ethernet 0/0 interface with the no shutdown
command and verified the configuration. However, when you rebooted the
router, the interface was shut down. You reconfigured the Fast Ethernet 0/0
interface and verified that the configuration works. Explain what most likely
happened.
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