Passing Cisco s CCNA and CCNP Exams Traceroute
Below is a MRR and PLR article in category Computers Technology -> subcategory Computer Certification.
Mastering Cisco’s CCNA and CCNP Exams: The Power of Traceroute
Overview
The traceroute command is a crucial tool for diagnosing WAN network issues and is essential for success in Cisco CCNA and CCNP exams. In this guide, Chris Bryant, CCIE
12933, explains how to effectively use traceroute.
Key Concepts
To excel in your CCNA and CCNP exams, understanding how to troubleshoot Cisco routers is vital. While the ping command checks basic IP connectivity, it lacks detailed diagnostic capabilities.
Example Scenario
Imagine there are six routers between CityA and CityB. You ping from A to B:
```plaintext
R1
ping 172.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.1.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
```
The periods indicate no IP connectivity, but ping doesn’t reveal which router is causing the issue. This is where traceroute is invaluable.
How Traceroute Works
Traceroute sends three datagrams with a Time To Live (TTL) of 1, which time out at the first router, prompting an ICMP Time Exceeded message. It continues this sequence with increasing TTL values until the final destination is reached, mapping the data path:
```plaintext
Router1
traceroute 271.1.1.1
Type escape sequence to abort.
Tracing the route to 271.1.1.1
1 20.1.1.1 4 msec 4 msec 4 msec
2 30.1.1.1 20 msec 16 msec 16 msec
3 271.1.1.1 16 msec * 16 msec
```
Problem Solving
If a router can’t reach the destination, traceroute exposes the issue:
```plaintext
Router1
traceroute 271.1.1.1
Type escape sequence to abort.
Tracing the route to 271.1.1.1
1 20.1.1.1 4 msec 4 msec 4 msec
2 30.1.1.1 20 msec 16 msec 16 msec
3 *
```
Here, the router at 30.1.1.1 lacks a route to the final destination, identifying where the problem lies.
Additional Tips
Be prepared for screens filled with asterisks. To abort the traceroute, the router suggests an escape sequence but doesn’t specify it?"use TWICE, typed quickly in succession.
Conclusion
Mastering traceroute not only prepares you for the CCNA and CCNP exams but also enhances your real-world networking skills. Plus, you’ll impress peers with your pro-level knowledge of stopping traceroute efficiently!
You can find the original non-AI version of this article here: Passing Cisco s CCNA and CCNP Exams Traceroute.
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