... CiscoTests ( http://www.networkstudyguides.com ) offers an online study guide with sample questions and information about the most current release of the CCNA, CCNP, and CCIE exams. For ... the Data Link layer and encodes the 1s and 0s into a digital signal from transmission on the network medium.3.The Network layer provides routing through an internetwork and log-ical addressing.4.The ... understand or do the following: Install, configure, and operate simple-routed LAN, routed WAN, and switched LAN and LANE networks. Understand and be able to configure IP, IGRP, IPX, serial,...