Free CCNA | Troubleshooting Static Routes | Day 11 Lab 2 | CCNA 200-301 Complete Course
Summary
TLDRIn this CCNA troubleshooting lab, Jeremy's IT Lab guides viewers through identifying and resolving network misconfigurations that prevent PC1 and PC2 from pinging each other. The video emphasizes the importance of hands-on practice for the CCNA exam, detailing the discovery and correction of errors on three routers. By the end, the network functions correctly, allowing successful pings, with a call to action for viewers to subscribe, engage, and support the channel.
Takeaways
- 😀 Welcome to Jeremy’s IT Lab, a free, complete course for CCNA aspirants.
- 📚 Encouragement to subscribe, like, comment, and share the video to support the free educational series.
- 🔍 Identification of a network topology with misconfigurations preventing PC1 and PC2 from pinging each other.
- 🛠️ Emphasis on troubleshooting as a critical skill for CCNA certification and its potential inclusion in the exam.
- 💡 Advice for viewers to attempt the lab independently to effectively practice troubleshooting skills.
- 🖥️ Demonstration of checking PC configuration using the 'IPCONFIG' command on Windows.
- 📡 Explanation of the 'physical address' being the MAC address, crucial for network interface identification.
- 🚀 Verification of the PC's ability to ping the default gateway, a prerequisite for accessing other networks.
- 🔍 On R1, the discovery of a misconfigured static route with the incorrect next hop address.
- 🛠️ Correction of the static route on R1 by changing the next hop address from 192.168.12.3 to 192.168.12.2.
- 🔄 On R2, the recognition of an incorrect exit interface in the static route configuration, leading to potential load-balancing issues.
- 🔧 Rectification of the exit interface on R2 from GigabitEthernet0/0 to GigabitEthernet0/1 for proper routing.
- 🔢 On R3, the identification of an incorrect IP address on the GigabitEthernet0/0 interface.
- 🔄 Immediate correction of R3's interface IP address without the need for prior deletion of the existing configuration.
- 📝 Brief inspection of R3's routing table to confirm the presence of a correct static route to the 192.168.1.0/24 network.
- 🔄 After fixing the misconfigurations, successful ping from PC1 to PC2 indicating resolution of the network issues.
- 👍 Final call to action for viewers to engage with the content and support the channel through subscriptions and sharing.
Q & A
What is the purpose of the video?
-The purpose of the video is to provide a free, complete course for the CCNA certification, focusing on troubleshooting a network topology with misconfigurations.
What is the main issue presented in the lab?
-The main issue is that PC1 and PC2 are unable to ping each other due to configuration errors on the routers.
Why is it important to try the lab before watching the video?
-It is important to try the lab first to practice your own troubleshooting skills and to avoid already knowing the problems, which would reduce the learning experience.
What command can be used to check the configuration on a Windows PC?
-The command 'IPCONFIG' can be used to check the basic configuration, and 'IPCONFIG /ALL' for more detailed information including the physical (MAC) address.
What is the significance of the default gateway in this context?
-The default gateway is significant because it is the first point of contact for a PC to reach other networks, and it must be correctly configured for proper network communication.
What was the misconfiguration found on R1's routing table?
-The misconfiguration was that the static route for the 192.168.3.0/24 network was pointing to the wrong next hop address, 192.168.12.3 instead of the correct 192.168.12.2.
How did the video demonstrate correcting the misconfiguration on R1?
-The video showed entering global config mode, deleting the incorrect configuration statement, and then re-entering it with the correct next hop address.
What was the issue with R2's routing table?
-The issue was that one of the static routes for the 192.168.3.0/24 network had an incorrect exit interface, GigabitEthernet0/0 instead of the correct GigabitEthernet0/1.
Why is it problematic to have two static routes for the same network in the routing table?
-Having two static routes for the same network can lead to load-balancing, which might send packets out of incorrect interfaces, causing network communication issues.
What was the misconfiguration on R3's interface?
-The misconfiguration was that R3's GigabitEthernet0/0 interface had an incorrect IP address, 192.168.23.3, instead of the correct 192.168.13.3.
How did the video ensure that the misconfigurations were fixed after making changes?
-The video checked the routing table and interface configurations using commands like 'SHOW IP ROUTE' and 'SHOW RUNNING-CONFIG' to confirm that the changes were applied correctly.
What was the final step to verify the lab's success?
-The final step was to go back to PC1 and try pinging PC2 again to ensure that the network was functioning correctly after the misconfigurations were fixed.
Outlines
😀 Introduction to CCNA Troubleshooting Lab
Jeremy’s IT Lab offers a free, comprehensive course for CCNA certification. The video script begins by inviting viewers to subscribe, like, comment, and share the content to support the free educational series. The lab scenario involves a familiar network topology with configuration errors that prevent PC1 and PC2 from pinging each other. The script emphasizes the importance of troubleshooting for the CCNA exam and encourages viewers to attempt the lab independently to practice their skills. The initial step is to confirm the communication issue between PCs, followed by a quick check of the PCs' IP configurations using the 'IPCONFIG' command. The script then moves on to router troubleshooting, starting with R1.
🛠️ Troubleshooting Router Configurations in a CCNA Lab
The script continues with a step-by-step guide to identify and fix configuration errors on three routers (R1, R2, and R3) within a network setup. For R1, the issue lies in a static route misconfiguration, where the next hop address is incorrect. The script demonstrates how to correct this by editing the routing table. Moving to R2, another static route problem is identified, where the exit interface for the 192.168.3.0/24 network is incorrect. The script shows how to remove the wrong route and add the correct one, preventing packet misrouting. Lastly, R3 has an interface IP address error, which is corrected by reconfiguring the interface with the right IP. After addressing these issues, the script concludes with a successful ping test between PC1 and PC2, indicating the network is now correctly configured. The video ends with a call to action for viewers to engage with the content and support the creator.
Mindmap
Keywords
💡CCNA
💡Network Topology
💡Misconfiguration
💡Troubleshooting
💡IP Address
💡Subnet Mask
💡Default Gateway
💡MAC Address
💡Routing Table
💡Static Route
💡Load Balancing
💡Interface
Highlights
Introduction to Jeremy’s IT Lab's free, complete CCNA course.
Encouragement for subscribers to engage with the content through likes, comments, and shares.
Identification of a network topology with configuration errors preventing PC1 and PC2 from pinging each other.
Emphasis on troubleshooting as a valuable practice for CCNA exam preparation.
Advice to attempt the lab independently before watching the solution video for effective learning.
Confirmation of the initial problem where PC1 cannot ping PC2.
Quick check of PC’s configuration using the IPCONFIG command.
Explanation of the physical address, which is the MAC address.
Verification of the default gateway's reachability from PC1.
Identification of a misconfiguration in R1's static route pointing to the incorrect next hop address.
Demonstration of how to correct a misconfiguration in the router's running configuration.
Fixing the incorrect exit interface in R2's routing table for the 192.168.3.0/24 network.
Clarification on the concept of load-balancing in routing and its implications in this scenario.
Identification and correction of R3's incorrect IP address on the GigabitEthernet0/0 interface.
Brief inspection of R3's routing table to confirm the presence of a static route to the 192.168.1.0/24 network.
Successful resolution of the network issues allowing PC1 to ping PC2 after corrections.
Call to action for viewers to subscribe, engage, and share the video for others studying for the CCNA.
Mention of accepting tips and providing links in the description for Brave verified publisher status.
Transcripts
Welcome to Jeremy’s IT Lab.
This is a free, complete course for the CCNA.
If you like these videos, please subscribe to follow along with the series.
Also, please like and leave a comment, and share the video to help spread this free series
of videos.
Thanks for your help.
You may recognize this network topology.
This is the same network we configured in the previous lab.
However, this time there are a few configuration errors, so PC1 and PC2 are unable to ping
each other.
As the lab instructions say, there is one misconfiguration per router, so we have to
find and fix the misconfigurations.
Troubleshooting labs like this are great practice for the CCNA.
Troubleshooting helps test your knowledge of the concepts, and troubleshooting questions
may also appear on the CCNA exam itself.
I highly recommend you try to complete this lab yourself first, if you watch the video
before you will already know what the problems in the network are and you won’t
practice your own troubleshooting skills.
Okay, before we get started troubleshooting, we should confirm the problem.
PC1 and PC2 should not be able to ping eachother.
I’ll go on PC1 and try to ping PC2.
Okay, let’s send that ping.
Ping 192.168.3.1.
Okay, the ping indeed does not work.
Although the misconfigurations are on the routers in this lab, let’s quickly check
the PC’s configuration.
To check the configuration on a windows PC, use the command IPCONFIG.
Here you can see the IP address, subnet mask, and default gateway.
If you want more detail, use the command IPCONFIG /ALL.
This gives more information, such as the physical address.
What is the physical address?
Well, it’s the MAC address.
Okay, let’s see if we can ping the default gateway, since to reach other networks we
need to be able to reach the default gateway.
PING 192.168.1.254.
Okay, no problems here.
Let’s go on R1 now and see if we can find the issue...enter privileged exec mode with
ENABLE.
First I’ll check if the interface configuration is okay.
SHOW IP INTERFACE BRIEF...the addresses are correct, and both interfaces are UP/UP, so
the interface configuration is fine.
Let’s check the routing table.
SHOW IP ROUTE...here’s the static route for the 192.168.3.0/24 network, but can you
see the misconfiguration?
It says via 192.168.12.3, but actually the next hop address should be 192.168.12.2, which
is the IP address of R2’s G0/0 interface.
Let’s check it in the running config.
Show running-config, and then I’m going to filter the output by using the PIPE symbol,
INCLUDE, and then ip route.
Here you can see the configuration statement.
I’m going to right click to copy it, and then go to global config mode.
CONFIGURE TERMINAL.
Now I’ll paste in the configuration statement, and use the keyboard shortcut CTRL+A to go to
the beginning of the line. Type NO, followed by a space, and then hit enter.
and that deletes the configuration statement.
Let’s check.
DO SHOW RUNNING-CONFIG, PIPE, INCLUDE IP ROUTE.
Okay, it’s gone.
Now I’ll paste in the configuration statement once more, and change this 3 to a 2.
I’ll use the up arrows to go back to the show running-config command, and now you can
see we have the correct configuration statement.
Let’s check the routing table one last time.
DO SHOW IP ROUTE.
Okay, there’s the correct route.
So, we have fixed the problem on R1.
Now let’s move on to R2. Enter privileged exec mode with ENABLE.
And let’s check the interface configuration.
SHOW IP INTERFACE BRIEF.
The IP addresses both are correct, and the interfaces are UP/UP, so no problems here.
Let’s check the routing table.
SHOW IP ROUTE.
We have two static routes as expected, 192.168.1.0/24 via 192.168.12.1 is correct. And
192.168.3.0/24, with an exit interface of gigabitethernet0/0, there’s our problem.
To reach the 192.168.3.0/24 network, R2 should use the gigabitethernet0/1 interface, not
0/0.
Let’s see what happens if I enter the correct route without removing the incorrect one.
CONFIGURE TERMINAL.
IP ROUTE 192.168.3.0 255.255.255.0 g0/1.
DO SHOW IP ROUTE.
Okay, you can see both routes are kept in the routing table, the second does not override
the first.
Because both are in the routing table, this means the router will ‘load-balance’ over
the two routes, sending some packets out of G0/0, and some packets out of G0/1.
Sometimes load-balancing is a good thing, but in this case the G0/0 interface is totally
wrong, so we should remove that configuration statement.
DO SHOW RUNNING-CONFIG, PIPE, INCLUDE IP ROUTE. Okay,
right click to copy, right click to paste. Hit CTRL-A to skip to the beginning of the line, and
type no.
Let’s see if the route was removed from the routing table.
DO SHOW IP ROUTE.
Okay, now we only have one route to 192.168.3.0/24, using the correct interface, G0/1.
Finally let’s look for the issue on R3. First enter privileged exec mode with ENABLE.
And once again I’ll check the interface configuration first.
SHOW IP INTERFACE BRIEF.
Both interfaces are UP/UP, however there is a misconfiguration here.
R3’s gigabitethernet0/0 interface should have an IP address of 192.168.13.3, not 192.168.23.3.
Let’s fix that.
CONFIGURE TERMINAL.
INTERFACE G0/0.
Now, unlike when configuring routes, we don’t have to remove the current configuration first.
If we enter a new IP address, it will overwrite the current IP address.
Let’s see the config before and after.
DO SHOW RUNNING-CONFIG. Okay, here’s the incorrect IP address.
Now let’s configure the correct IP address.
IP ADDRESS 192.168.13.3 255.255.255.0.
Let’s check the config again.
DO SHOW RUNNING-CONFIG. As you can see, the previous configuration was automatically
overwritten, we did not have to delete it.
Okay, since we are told there is one misconfiguration per router, we don’t have to check the routing
table, but let’s take a quick look anyway.
R3 should have a static route to the 192.168.1.0/24 network.
DO SHOW IP ROUTE. There it is, via 192.168.13.2, which is R2.
Now that we have fixed the misconfigurations, let’s go back on PC1 and try out that ping
again.
The first ping or two might fail, but after that they should all succeed.
Let’s give it a shot.
PING 192.168.3.1.
Okay, so after finding and fixing the misconfigurations on R1, R2, and R3, PC1 is now able to ping
PC2.
That’s all for this lab.
Thank you for watching.
Please subscribe to the channel, like the video, leave a comment, and share the video
with anyone else studying for the CCNA.
If you want to leave a tip, check the links in the description.
I'm also a Brave verified publisher and accept BAT, or Basic Attention Token, tips via the
Brave browser.
That's all for now.
تصفح المزيد من مقاطع الفيديو ذات الصلة
Free CCNA | Configuring Static Routes | Day 11 Lab 1 | CCNA 200-301 Complete Course
Free CCNA | The Life of a Packet | Day 12 | CCNA 200-301 Complete Course
Free CCNA | Interfaces and Cables | Day 2 | CCNA 200-301 Complete Course
Free CCNA | OSI Model | Day 3 Lab | CCNA 200-301 Complete Course
How to Access CCNA Physical Racks: Step-by-Step Guide for Beginners! | #networkershome
Free CCNA | Basic Device Security | Day 4 Lab | CCNA 200-301 Complete Course
5.0 / 5 (0 votes)