In preparation for your CCNA and CCNP exam success, you've got to learn to troubleshoot Cisco routers. And while ping is a great basic IP connectivity tool, it doesn't give you all the information you need to diagnose network connectivity issues.
Let's say you have six routers between CityA and CityB. You send a ping from A to B, and get this return:
Laptop Battery R1#ping 172.1.1.1
You searched for information on battery and laptop computer. Your new compaq laptop battery comes in a discharged condition and must be charged before use (refer to your computer manual for charging instructions). Of course, once you decide on the laptop computer battery you need, you will want to receive it right away. Plug battery pack into DC input of your laptop computer which is located in backside of laptop usually. Toshiba laptop battery laptop batteries, laptop battery, toshiba laptop battery, batteries for laptop computer.
Thinkpad Type escape sequence to abort.
As a rental organization ICC has kept strong focus on service by following strict quality control procedures and providing 24 hour a day, 7 day a week technical support on every computer rental. Feel secure when renting a computer from iccrents.com. Rent Laptops from Quick, 1000 laptops in stock, HP, CPQ, Dell, IBM, 24x7 Support, Same Day deliveries available nationwide. 20 years of experience.
Microsoft Sending 5, 100-byte ICMP Echos to 172.1.1.1, timeout is 2 seconds:
Computer memory is the quickest, cheapest, and easiest way to improve the performance of your system. Find RAM memory upgrades for desktops, laptops, servers, and printers all backed by a lifetime warranty and guaranteed compatible with your computer. Shipping is an everyday low price of $1.99! Computer Memory Outlet sells memory compatible with all leading computer manufacturers like Dell, Apple, Compaq, HP, Sony, IBM, Lenovo, and many more.”
Laptop Computers .....
Errata Description Table of Contents Author Information Perfect Your Cisco(r) Networking Skills on a Virtual Network! If you're serious about passing the CCNA exam, on experience with routers and switches. This unique software product offers unlimited opportunities for you to practice your skills on a virtual network. -or design your own custom networks and labs. An affordable alternative to products and courses costing hundreds, even thousands, of dollars, the CCNA Virtual Lab, -and in the real world.
Laptop Computer Success rate is 0 percent (0/5)
CCNA Virtual Lab, Titanium Edition ( 0470148942)-- on practice with routers and switches is critical for success on the CCNA exam, yet the costs associated with the required hardware are prohibitive. drop technology, the CCNA Virtual Lab, Titanium Edition allows users to create a simulated lab using an unlimited number of routers and switches. Users can then either follow the lab exercises provided or experiment with the hundreds of configuration commands built into the simulator. An extensive Help menu is available to guide users through complex tasks.
Desktop Computer The five periods indicate that there is no IP connectivity to CityB. Problem is, that's about all ping tells you. You can have 5 or 50 routers between the two points, so how can you tell which downstream router has the problem?
Notebooks That's where traceroute comes in. Traceroute sends three datagrams with a Time To Live (TTL) of 1. Those datagrams will timeout once they hit the first router in the path, and that router will respond with an ICMP Time Exceeded message.
Lenovo In response, the sending router sends three more datagrams, but these have a TTL of 2. This means that the next router in line will send back ICMP Time Exceeded messages. This process continues until the final destination (CItyB) is reached the output of the command shows us the path the data took:
Hard Drive Router1#traceroute 271.1.1.1
Travelstar
Type escape sequence to abort.
Gateway Tracing the route to 271.1.1.1
Laptop Parts
1 20.1.1.1 4 msec 4 msec 4 msec
Software 2 30.1.1.1 20 msec 16 msec 16 msec
Hard Drives 3 271.1.1.1 16 msec * 16 msec
Electronics How does this help troubleshoot a problem? Let's say that the second router in this path, 30.1.1.1, doesn't know how to get to 271.1.1.1. The output would look like this:
Canon Router1#traceroute 271.1.1.1
Desktop Pc
Type escape sequence to abort.
Desktop Computers Tracing the route to 271.1.1.1
Think Pad
1 20.1.1.1 4 msec 4 msec 4 msec
Repair 2 30.1.1.1 20 msec 16 msec 16 msec
Data Recovery 3 * * *
Cisco This indicates that the router at 30.1.1.1 doesn't know how to get to the final destination. Now you have a better idea of which router has an issue!
Keyboard Now here's the bad part: you're going to get 30 lines of three asterisks, and until you abort this traceroute, you're going to just watch those asterisks go across the screen. There's an abort sequence that the router mentions in the first line of the console output, but the router doesn't tell you what it is! So I will - this top-secret sequence is TWICE, one right after the other.
Monitor That keystroke takes a little getting used to, but a CCNA or CCNP can do it! Add this command to your Cisco skill set, and it will serve you well both on the CCNA and CCNP exams and your real-world networks. And you'll impress your friends by knowing how to stop a traceroute!
Desktop
Infosys Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (http://www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, Ultimate CCNP Study Packages, and CCNA CBT video training. Pass the CCNA exam ,BSCI exam , and BCMSN exam with Chris Bryant, CCIE #12933!
For a copy of his FREE "How To Pass The CCNA" or "How To Pass The CCNP" ebook and receive a FREE CCNA and CCNP question every day, just visit the website and claim your free copies!
