JNCIA Study Guide
Last Updated: 3/17/26 Table of Contents Networking Fundamentals Junos OS Fundamentals User Interfaces Configuration Basics Operational Monitoring and Maintenance Routing Fundamentals Routing Policy and Firewall Filters Glossary Networking Fundamentals Function of routers and switches Routers use l3 information to forward packets between networks Switches use l2 info to forward packets on the lan Ethernet networks Major concept here is Mac addresses Physical address made up of 48 bits and displayed using hexadecimal format Broadcast address is ffff.ffff.ffff Uses mac addresses to forward ethernet frame Ethernet header + trailing checksum ...