CCENT/CCNA ICND1 100-101 Official Cert Guide

Ethernet WANs that Create a Layer 2 Service

The WAN services implied by Figure 3-9 include a broad number of services, with a lot of complex networking concepts needed to understand those services. Yet, we sit here at the third chapter of what is probably your first Cisco certification book, so clearly, getting into depth on these WAN services makes little sense. So, for the purposes of the CCENT certification, this book focuses on one specific Ethernet WAN service that can be easily understood if you understand how Ethernet LANs work.

Note

For perspective about the broad world of the service provider network shown in Figure 3-9, consider the Cisco certification paths for a moment. Cisco has CCNA, CCNP, and CCIE certifications in many areas: ...