Studying for the CCIE RS Written and Lab – EIGRP Stub

January 13, 2018 at 12:41 pm


In this video, Anthony Sequeira gives a tip on how we should consider preparing for the CCIE written and lab exams simultaneously.

3.5.d EIGRP Basic Config Speed Drill

January 12, 2018 at 9:21 pm
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.75.1 Lab Exam Strategies; Config Section- Core vs Non-Core Tasks

January 8, 2018 at 10:15 am
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400-101 CCIE R&S Written – Free Resources – TCP Operations

December 30, 2017 at 9:48 am


Here are the free resources surrounding the Explain TCP Operations section of the CCIE R&S Written version 5.1 exam.

1.1.e Explain TCP Operations

  • 1.1.e.i     IPv4 and IPv6 PMTU
  • 1.1.e.ii    MSS
  • 1.1.e. iii  Latency
  • 1.1.e. iv  Windowing
  • 1.1.e.v    Bandwidth delay product
  •   Global synchronization
  • 1.1.e       Options

TCP Performance – The Internet Protocol Journal – Volume 3, No. 2

Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC

IP Application Services Configuration Guide, Cisco IOS Release 15M&T

IPv6 Addressing and Basic Connectivity Configuration Guide, Cisco IOS Release 15M&T

IP SLAs Configuration Guide, Cisco IOS Release 15M&T

TCP Options

TCP Global Synchronization 

TCP/IP Illustrated, Volume 1


400-101 CCIE R&S Written – Free Resources – IP Operations

December 27, 2017 at 3:48 pm


1.1.d Explain IP Operations

1.1.d.i ICMP unreachable, redirect
1.1.d.ii IPv4 options, IPv6 extension headers
1.1.d.iii IPv4 and IPv6 fragmentation
1.1.d.iv TTL
1.1.d.v IP MTU

An Overview of TCP/IP

ICMP Redirects

IPv6 Extension Headers

Resolve IPv4 Issues

TTL Expiry Attack

Configuring IP Services 

Routing TCP/IP Volume 1 – 2nd Edition  – Chapter 1

400-101 CCIE R&S Written – Free Resources – Challenges

December 23, 2017 at 10:06 am


1.1.c Explain general network challenges

  • Unicast flooding
  • Out of order packets
  • Asymmetric routing
  • Impact of micro burst

Unicast Flooding 

Issues with Asymmetric Routing 

General Network Challenges 

Micro Burst Monitoring

Cisco IOS XE Processes

December 21, 2017 at 6:07 pm


The Cisco IOS XE code ensures that as much as possible is modular in the device architecture. As such, note that many separate processes are responsible for a host of functions on the Cisco device. Here is a handy list of common individual processes and their function!

  • Chassis Manager – Responsible for all chassis management functions, including management of the HA state, environmental monitoring, and FRU state control
  • Host Manager – Provides an interface between the IOS process and many of the information-gathering functions of the underlying platform kernel and operating system
  • Logger – IOS facing logging services
  • Interface Manager – Provides an interface between the IOS process and the per-SPA interface processes on the SIP
  • IOS – Implements all forwarding and routing features on the device
  • Forwarding Manager – Manages the downloading of configuration to each of the ESPs and the communication of forwarding plane information, such as statistics, to the IOS process
  • Pluggable Services – The integration point between platform policy application, such as authentication and the IOS process

Exam Review: 400-101 CCIE Routing and Switching

December 20, 2017 at 6:16 pm



This exam has been one of the most talked about (bitched about) exams for a while now as it was declared to be riddled with errors and generally NOT passable. The great news is, based on my experience today – this has changed!

Exam Homepage

Have some patience and explore the many valuable links and resources awaiting you from the exam homepage below. You need patience because some of them can be a bit hidden across several different websites. But this starting point is still a great one.

400-101 CCIE Routing and Switching

The 400-101 Exam

You can expect 100 questions on this 400-101 exam with a passing score of about 804. You have 120 minutes for the exam. Time pressure is NOT an issue. I say this even as a very fast test taker and an author of a text on how to pass.

The exam breaks down accurately into the following sections. Notice the percentage breakdown of the number of questions you will face! This seemed very accurate per my experience with the actual exam.

  • 1.0 Network Principles 10%
  • 2.0 Layer 2 Technologies 13%
  • 3.0 Layer 3 Technologies 37%
  • 4.0 VPN Technologies 13%
  • 5.0 Infrastructure Security 5%
  • 6.0 Infrastructure Services 12%
  • 7.0 Evolving Technologies 10%

So the 400-101 exam is biased toward L3? YES! Sorry for all of you that were excited about Evolving Technologies!  Here are the topics in that L3 domain if you want to start your studying right away in the most important area:

  • 3.1 Addressing technologies
  • 3.2 Layer 3 multicast
  • 3.3 Fundamental routing concepts
  • 3.4 RIP [v2 and v6]
  • 3.5 EIGRP [for IPv4 and IPv6]
  • 3.6 OSPF [v2 and v3]
  • 3.7 BGP
  • 3.8 ISIS [for IPv4 and IPv6]

Know these – and know them well. I can confirm plenty of questions from each subdomain were there! Also, be sure to remember new features in addition to “classic” capabilities.

Question Types

What types of questions can you expect? Here they are:

  • Simple multiple choice – this is the most common question type you face
  • Multiple correct – multiple choice – you will not face any “Choose all that apply”; you will always be told exactly how many are correct
  • Drag and drop – I love these!

Exam Mechanics

Here are some important things to know about how the exam functions:

  • There is a countdown timer in the top right corner! Keep an eye on it! While I do not think time will be an issue, be aware of how many questions remain, and how much time you have left.
  • There is no ability to go back. Once you click next to answering your question – THAT IS IT!
  • There is no review of your answers possible at the end of the test.
  • There is a comment button if you want to send Cisco a nasty note about the question. 🙂

Various Thoughts

Here are tips and various thoughts I have for you on this exam:

  • For each section of the exam blueprint, I am making free study resource links available for you. For example – see here: IOS XE These really should be all you need to pass, especially if you are recertifying as an existing CCIE in R&S!
  • Resist the temptation to do most of your studying in the blueprint areas you are already well versed on! Attack those areas OUTSIDE of your comfort zone. For me, these were:
    • Implement and troubleshoot PPP
    • Describe WAN rate-based ethernet circuits
    • Tunneling
    • Encryption
    • Describe 802.1x
    • Network services
    • Internet of Things
  • Be ready to be a bit off balance with the level of difficulty variation in questions. For example, you might get two that are CCNA level on STP, but then get one straight out of the documentation that really makes you think and think hard!
  • Some of the more difficult questions are actually easier than you think if you really read carefully and examine the exhibits closely.
  • I found no errors or grammatical mistakes or technical errors in the exam. If those did exist for this exam as reported, they have been cleaned up.
  • Enjoy the study for this exam and the experience! Outside of the $450, I really did love refreshing on these technologies as I prepared.

I am sure you have questions for me if you are still reading at this point. Hit me with those in the comments area below! Thanks!