“This is just a PDF,” she sighed. “How will this help?”
Elena followed the steps exactly. She configured the Gig0/0 interface on the router, set the VLANs on the switches, and even remembered to issue no shutdown . She typed the ping command.
Years later, when a new intern asked how to prepare for the CCNA, Elena smiled. She handed over the same PDF— Guia de Laboratorios CCNA 200-301 Versión 7.1 —and said the same words Joaquín once told her:
She checked her cables. Fine. She checked the IP addresses. Correct. She re-read the PDF’s note: “Remember: switches are transparent by default, but VLAN 1 is not your friend in production.” guia de laboratorios ccna 200-301 version 7.1 pdf
On exam day, the proctor handed her a scratch sheet. The first simulation question was a disaster: a broken EIGRP configuration with mismatched AS numbers. Her hands didn’t shake. She had done this exact fix in Lab 5.3 of the Guia de Laboratorios .
Her mentor, a retired network engineer named Joaquín, noticed her frustration. He didn't hand her a thick textbook. Instead, he slid a worn USB drive across the table.
Joaquín smiled. “Because it forces you to fail before you succeed. Now go home. Open Packet Tracer. Start with Lab 1.1. Do not move to Lab 1.2 until you see the words ‘PING successful.’” “This is just a PDF,” she sighed
She followed the steps like a recipe. The switch came back online in 11 minutes.
“Forget the theory for a while,” Joaquín said. “Inside that drive is a file: Guia_de_Laboratorios_CCNA_200-301_v7.1.pdf . It’s not a novel. It’s a map.”
A year later, Elena was a junior network admin. A core switch at a client’s office went down. The senior engineer was on vacation. Elena opened her laptop, navigated to the old USB drive, and found the PDF. Lab 9.2: Recovering a Switch via Xmodem and Password Recovery. She typed the ping command
..... Success rate is 0 percent.
!!!!! Success rate is 100 percent.
She deleted the interface, reconfigured it with the correct dot1q encapsulation, and held her breath.
She passed with a 932.
That’s when she saw it. She had configured the access port on the wrong VLAN. The PC was on VLAN 10, but the router’s subinterface was listening on VLAN 1.