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31 Days Before Your CCNA Routing and Switching Exam: A Day-By-Day Review Guide for the ICND2 (200-101) Certification Exam, Third Edition by Allan Johnson

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Day 3. Troubleshooting WAN Issues

CCNA 200-101 ICND2 Exam Topics

Image Troubleshoot and resolve WAN implementation issues

Key Topics

Today wraps up your review of WAN technologies with some tips for troubleshooting WAN implementations.

Troubleshooting WAN Implementations

Troubleshooting your overall WAN implementation (not just Frame Relay aspects) often starts with investigating the state of the local router’s serial interface. The show interfaces serial command in Example 3-1 has the default HDLC encapsulation.

Example 3-1 Output from the show interface serial Command

R1# show interface serial 0/0/0Serial0/0/0 ...

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