JNCIA – Junos JN0-102 – Juniper Device Interfaces

July 29, 2018 at 12:49 pm

In this sample Nugget from my JN0-102 course at CBT Nuggets, I walk you through important aspects of how interfaces work on Juniper equipment.




How Juniper Standard Firewall Filters Evaluate Packets

July 28, 2018 at 1:00 pm


This post is critical for those students studying for their Enterprise Routing and Switching Certifications.

Firewall Filter Packet Evaluation Overview

The following sequence describes how the device evaluates a packet entering or exiting an interface if the input or output traffic at a device interface is associated with a firewall filter.

Packet evaluation proceeds as follows:

  1. The device evaluates the packet against the terms in the firewall filter sequentially, beginning with the first term in the filter.
  2. If the packet matches all the conditions specified in a term, the device performs all the actions specified in that term.
  3. If the packet does not match all the conditions specified in a term, the device proceeds to the next term in the filter (if a subsequent term exists) and evaluates the packet against that term.
  4. If the packet does not match any term in the firewall filter, the device implicitly discards the packet.

Unlike service filters and simple filters, firewall filters support the next term action, which is neither a terminating action nor a nonterminating action but a flow control action.

If the matched term includes the next term action, the device continues evaluation of the packet at the next term within the firewall filter.

If the matched term does not include the next term action, evaluation of the packet against the given firewall filter ends at this term. The device does not evaluate the packet against any subsequent terms in this filter.

A maximum of 1024 next term actions are supported per firewall filter configuration. If you configure a firewall filter that exceeds this limit, your candidate configuration results in a commit error.

The device stops evaluating a packet against a given firewall filter when either the packet matches a term without the next term action or the packet fails to match the last term in the firewall filter.

Your JNCIA-Junos (JN0-102) Study Tracker

July 27, 2018 at 4:47 pm


If you know anything about my approach to certifications, you will know that I am a huge proponent of building a tracker to make sure you are studying the right topics and to measure your progress and keep yourself accountable.

NOTE: I only show Section 1 below on my blog home page – you might need to click the READ MORE link in order to see the other sections.

Section 1: Networking Fundamentals

Identify the concepts and functionality of various fundamental elements of networking

  • The function of routers and switches
  • Optical network fundamentals – SONET/SDH, OTN
  • Ethernet networks
  • Layer 2 addressing, including address resolution
  • IPv4 and IPv6 fundamentals
  • Layer 3 / IP addressing, including subnet masks
  • Subnetting and supernetting
  • Decimal to binary conversion
  • Longest match routing
  • Connection-oriented vs. connectionless protocols

Juniper iBGP Peering Example

July 16, 2018 at 11:10 pm

This Sneak Peek Nugget is from my BGP – Peering module at CBT Nuggets. This is one module of three on BGP that are currently complete and live on CBT Nuggets. These modules consist of many videos that provide detailed coverage on BGP with both Cisco and Juniper examples.


Juniper Expands the “Test at Home” Option for Certification Exams!

March 23, 2018 at 1:30 pm


I have never done an exam this way with Juniper – but I plan to next week. I will do a full report here on the blog regarding the experience. You can test in the convenience of your home or office with the proctor monitoring you via Webcam!

The Juniper Networks Certification Program team has expanded the online proctoring (OP) option from our Associate-level exams only to now include our Specialist and Professional-level certification exams.

This expansion means thirteen additional Specialist and Professional certifications are now available to take online including our newest Cloud and Automation/DevOps exams.

To make sure you are able to test this way – be sure to run their simulation of the experience located here:

Click Here to Test Your Setup

Juniper JNCIS-ENT (JN0-343) Static, Aggregated, and Generated Routes

July 14, 2017 at 2:32 pm

Here is your FREE Nugget of the day! Enjoy this look into the world of Juniper networking! Here we look at Static, Aggregated, and Generated Routes! Keep in mind this is one course of many dedicated to Juniper Networking at CBT Nuggets. You can find them here: CLICK HERE.