Juniper JNCIA-JUNOS with LABS

Understand Juniper kernel architecture based on FreeBSD Unix, featuring separate control and forwarding planes with routing and packet forwarding engines, and process isolation for resilient routing.

Master command line access to juniper routers via out-of-band console and management ports or in-band ssl/ssh, and manage root vs non-root users with appropriate permissions, plus web gui.

Learn to filter and shape router output in Juniper Junos CLI, using show and display commands, counting lines, saving configurations, and using compare, last, and no more options.

Identify how the active (running) configuration on a Juniper device differs from the candidate configuration created in configuration mode. Commit applies candidate changes to active.

Explore the Juniper configuration command and compare shared, exclusive, and private configuration modes, including commit behavior, multi-user access, and hostname changes in lab drills.

Learn to create and save a rescue configuration, load it as the active configuration when needed, test the rescue configuration, roll back to it, and delete it when required.

Monitor real-time network traffic on a router and monitor a specific interface using monitor and monitor interface commands to identify bottlenecks and errors.

Master viewing interface statistics and errors using show interfaces with brief, detail, and extensive outputs. Learn to check status, speed, and IP addresses across interfaces.

Learn to reboot and shut down Junos devices from the command line. Use request system power-off and reboot with optional delays and messages to users.

Demonstrates routing and forwarding tables on a Juniper router through a seven-point lab, covering active routes, direct and local routes, default static and next-hop behavior, and forwarding table decisions.

Explore how to create and assign routing instances on juniper devices to separate two customer networks, using a second virtual router and dedicated interfaces to keep routing tables isolated.

Demonstrates configuring a routing policy to advertise a default static route via SBF, creating a policy term from static routes, and exporting it to a neighbor.

Explore the OSI model's seven layers from physical to application, their functions, and encapsulation and decapsulation using PDU terminology.

Learn how the IP model aligns with the OSI framework, and how collision domains and broadcast domains shape network access, with hubs, switches, and routers stopping broadcasts.

Learn how ARP resolves MAC addresses for IP delivery, and how unicast, broadcast, and multicast traffic operate, with ARP table learning of mappings.

Learn decimal to binary and binary to decimal conversions with IP addresses and octets, including base-2 arithmetic and quick checks using a calculator.

Explore subnetting calculation by dividing a /24 into two subnets to provide 128 hosts per subnet, meeting 75-host needs, with borrowed bits and usable IP ranges.

Learn how a layer two switch builds a mac address table, floods frames to all ports until it learns the source and destination addresses, and then forwards traffic directly.