Juniper Networks Certified Internet Associate JNCIA-Junos (JN0-104)

Introduction to Junos Networks

• Overview of Juniper Networks:

  • Introduction to the Junos OS architecture.
  • Key features and benefits of Junos OS.
  • Overview of Juniper Networks' hardware and software offerings.

• Junos OS Structure:

  • Separation of control and forwarding planes.
  • Role and functions of the Routing Engine (RE) and Packet Forwarding Engine (PFE).

• Basic Junos Operations:

  • Boot sequence and system initialization.
  • Software installation and upgrade processes.

Configuring Network Interfaces

• Interface Naming Conventions:

  • Understanding interface names and types (e.g., ge-0/0/0 for Gigabit Ethernet interfaces).

• Basic Interface Configuration:

  • Assigning IP addresses and subnet masks to interfaces.
  • Configuring interface properties such as speed, duplex, and description.
  • Enabling and disabling interfaces.

• Advanced Interface Options:

  • Configuring VLANs and interface tagging (802.1Q).
  • Using logical units for subinterfaces.

Configuration of Routing Protocols, Including OSPF and BGP

• Static Routing:

  • Configuring static routes.
  • Understanding route preference and next-hop resolution.

• Dynamic Routing Protocols:

  • Open Shortest Path First (OSPF):
    • Basics of OSPF operation and terminology (areas, LSAs, etc.).
    • Configuring OSPF on Junos devices.
    • Verifying OSPF configuration and operation.
  • Border Gateway Protocol (BGP):
    • Basics of BGP operation and terminology (AS numbers, peers, etc.).
    • Configuring BGP on Junos devices.
    • Verifying BGP configuration and operation.

• Routing Policy and Filtering:

  • Configuring and applying routing policies.
  • Using route filters to control routing information.

Configuring Ethernet Switching

• Switching Fundamentals:

  • Understanding MAC learning and forwarding.
  • Configuring switch ports.

• VLANs:

  • Configuring VLANs and VLAN membership.
  • VLAN tagging (802.1Q) and configuring trunk ports.

• Spanning Tree Protocol (STP):

  • STP operation and importance in preventing loops.
  • Configuring and verifying STP on Junos devices.

• Link Aggregation:

  • Configuring link aggregation groups (LAG) for redundancy and increased bandwidth.

Network Security Concepts and Implementing Security in Junos

• Basic Security Concepts:

  • Principles of network security (CIA: Confidentiality, Integrity, Availability).
  • Threats and vulnerabilities in networking.

• Junos Security Features:

  • Configuring Junos security zones.
  • Setting up security policies to control traffic between zones.
  • Using firewall filters for packet filtering.

• Advanced Security Options:

  • Configuring intrusion detection and prevention (IDP) policies.
  • Implementing screen options to protect against common network attacks.

Using the Junos Command Line Interface (CLI)

• CLI Basics:

  • Navigating the CLI: Operational and configuration modes.
  • Using help and autocompletion features.

• Configuration Management:

  • Understanding and managing the configuration hierarchy.
  • Committing, comparing, and rolling back configurations.
  • Saving and loading configuration files.

• Operational Commands:

  • Common operational mode commands for monitoring and troubleshooting.
  • Using show commands to view system and interface status.

Troubleshooting Common Network Issues

• Monitoring Tools:

  • Using show and monitor commands to check system health.
  • Viewing and interpreting logs and trace files.

• Interface Troubleshooting:

  • Diagnosing and resolving interface issues (e.g., link failures, misconfigurations).
  • Checking interface statistics and errors.

• Routing Troubleshooting:

  • Verifying routing tables and protocols.
  • Troubleshooting route advertisement and reception issues.

• Security Troubleshooting:

  • Analyzing security policies and firewall filters.
  • Identifying and resolving security configuration issues.

• General Troubleshooting Techniques:

  • Utilizing ping and traceroute for connectivity testing.
  • Applying a systematic approach to isolate and resolve network problems.