Network technologies and trends


October 31, 2010  6:36 PM

OSPF from CCNA- ICND2 perspective – Series 2



Posted by: Yasir Irfan
CCNA tips, Classless Inter-Domain-Routing (CIDR), Dijkstra algorithm, Distance vector protocols, how OSPF works?, ICND2 certification exam, ICND2 tips, ink state protocol, IPv4 networks, IPv6 networks, Open Shortest Path First (OSPF), OSPF, OSPF from CCNA- ICND2 perspective, OSPFv2, OSPFv3, RIP1, RIP2, Variable-Length Subnet Masking (VLSM)

Most people were introduced to OSPF as the first link-sate routing protocol and some of the features of OSPF are as follows,

  • Consists of areas and autonomous systems
  • Minimizes routing update traffic
  • Allows scalability
  • Supports VLSM/CIDR
  • Has unlimited hop count
  • Allows multi-vendor deployment (open standard)

Do know these features well from CCNA point of view.

The below table compares OSPF with the distance vector routing protocols like RIP1 and RIP2

Characteristic OSPF RIP2 RIP1
Type of protocol Link state Distance vector Distance vector
Classless support Yes Yes No
VLSM support Yes Yes No
Auto-summarization No Yes Yes
Manual summarization Yes No No
Discontiguous support Yes Yes No
Route propagation Multicast on change Periodic multicast Periodic broadcast
Path metric Bandwidth Hops Hops
Hop count limit None 15 15
Convergence Fast Slow Slow
Peer authentication Yes Yes No
Hierarchical network Yes (using areas) No (flat only) No (flat only)
Updates Event triggered Route table updates Route table updates
Route computation Dijkstra Bellman-Ford Bellman-Ford

October 30, 2010  10:55 AM

OSPF from CCNA- ICND2 perspective – Series 1



Posted by: Yasir Irfan
CCNA tips, Classless Inter-Domain-Routing (CIDR), Dijkstra algorithm, Distance vector protocols, how OSPF works?, ICND2 certification exam, ICND2 tips, ink state protocol, IPv4 networks, IPv6 networks, Open Shortest Path First (OSPF), OSPF, OSPF from CCNA- ICND2 perspective, OSPFv2, OSPFv3, RIP1, RIP2, Variable-Length Subnet Masking (VLSM)

If you are preparing for your CCNA or ICND2 certification exam for sure you are going to encounter OSPF. Open Shortest Path First (OSPF) is a better choice when you have a heterogeneous network, yes it’s a open standard routing protocol which over comes the major draw backs of Distance vector protocols like RIP 1 and RIP2. OSPF is a link state protocol, which can be quite useful on a large network with hundreds of routers.

Unlike Distance vector protocols OSPF will not exchange full route updates at short interval rather the routing updates are send once there is a change in routing topology. Using the  Dijkstra algorithm,OSPF first constructs the shortest path tree and then the routing table is populated which results in best paths to the destination. Due to this behavior, OSPF is able to recalculate the routes very fast in case of topology changes or a failure in link occurred. One of the OSPF’s advantage is convergence occurs quite fast and its scalable. Currently OSPFv2 is used with IPv4 networks and IPv6 networks use OSPFv3. OSPF also supports Variable-Length Subnet Masking (VLSM) and Classless Inter-Domain-Routing (CIDR).

In upcoming post I will talk about how OSPF works? and I will compare it with RIP1 and RIP2


October 28, 2010  2:05 PM

An ultimate CCNA self study guide, worth having one.



Posted by: Yasir Irfan
CCNA, CCNA Certification, CCNP Study Package Bundle, Chris Bryant, Cisco Press, The Ultimate CCNA Study Package, Train Signal CCN Training Videos

Recently I had an opportunity to go thru the CCNA study guide prepared and authored by Chris Bryant, the man behind the famous Train Signal CCNA Training videos. I know when any one plans for achieving CCNA Certification he faces an uphill task, when it comes to purchase the study guides, especially when there are plenty of resources available. I did studied lot of study guides and I am always very comfortable with the Cisco Press titles, but The Ultimate CCNA Study Package from Chris Bryant is really an ultimate study guide.

The best part I liked about The Ultimate CCNA Study Package is its very concise and its up to the point in a clear simple language. His way of explaining the Networking concepts is amazing and the end of the each chapter there is a summary by title “Hot spots and Gotchas” which is really very helpful.

Pic Courtesy: thebryantadvantage.com

The preparation exam comes with The Ultimate CCNA Study Package tests your skills in detail and it’s very helpful to practice those tests before planning for the exam. In short an excellent study resource for some one who is aspiring to be a CCNA. Recently Chris Bryant launched his CCNP Study Package Bundle if get an opportunity I will review them.


October 22, 2010  7:17 AM

CCSP is now CCNP Security



Posted by: Yasir Irfan
CCNP Security, CCSP, CCSP is now CCNP Security, Cisco Certifications, Cisco Press, Cisco Press Self-Study, FIREWALL 642-617, Firewall Official Certification Guide, Network Technologies and Trends, Secure 642-637, Secure Official Certification Guide, Secure Quick Reference, VPN 642-647 and IPS 642-627, VPN Official Certification Guide

As part of Certifications revisions, Cisco announced CCSP will no longer be there, it will be replace with CCNP Security, however CCSP certification aspirers  can attempt their exams until April 2011, yeah April 2011 is the time for transition. And CCSP will be valid until 2014 so I would advice the Cisco Certification aspirers to peruse CCNP Security.

The newly announced CCNP Security is designed to enforce the skills needed to deploy, service and support from Cisco Network Security Engineers. The newly announced CCNP Security certification comprises of 4 exams namely Secure 642-637, FIREWALL 642-617, VPN 642-647 and IPS 642-627.

Individuals that have recently taken the CANAC and MARS exams to achieve CCSP will have until October 2011 to complete their certification using the new SECURE, IPSv7, FIREWALL, or VPN exams. For a complete listing of combinations to achieve the CCSP certification, please access the CCSP Security combination tool.

As expected Cisco Press is coming up with the Self-Study resources and the title and tentative dates as follows

  • Secure Quick Reference (eBook)-Coming January 2011
  • Secure Official Certification Guide

◦                     Rough Cut Edition-Coming November 2010 (Rough Cuts provide online access to pre-publication manuscript)

◦                     Print and eBook Edition-Coming February 2011

  • Firewall Quick Reference (eBook)-Coming January 2011
  • Firewall Official Certification Guide

◦                     Rough Cut Edition-Coming November 2010 (Rough Cuts provide online access to pre-publication manuscript)

◦                     Print and eBook Edition-Coming March 2011

  • VPN Quick Reference (eBook)-Coming January 2011
  • VPN Official Certification Guide

Rough Cut Edition-Coming November 2010 (Rough Cuts provide online access to pre-publication manuscript)

Print and eBook Editions-Coming March 2011

  • IPS Quick Reference (eBook)-Coming January 2011
  • IPS Official Certification Guide

◦                     Rough Cut Edition-Coming October 2010

◦                     Print and eBook-Coming February 2011

If any one is planning for CCNP Security please do let me know, for further details please do access the Cisco CCNP Security page.


October 22, 2010  6:11 AM

CCVP will be known as CCNP Voice



Posted by: Yasir Irfan
CAPPS (642-467). Cisco Unified Communication Applications, CCNP, CCNP voice, CCNP Voice Self study resources, CCVP, CIPT2 (642-457), Cisco Certifications, Cisco Press, Cisco Systems, CVOICE (642-437) CIPT1 (642-447), QOS, TVOICE (642-427)

Cisco announced major changes in the CCVP certification, now CCVP will be known as CCNP Voice.

The new CCNP voice certification retains the 5-exam model with updated versions of CVOICE (642-437) CIPT1 (642-447), CIPT2 (642-457), TVOICE (642-427) and CAPPS (642-467). TUC is renamed as TVOICE and QOS is no more in the CCNP voice however some of the QOS topics are moved to CVOICE. CAPPS is the new entry to the CCNP voice better known as Cisco Unified Communication Applications (CAPPS).

Pic Courtesy: Cisco Learning Network

Cisco Press is always there to assists you whenever Cisco announces any major revisions for their certifications; here are tentative dates from Cisco press to publish the CCNP Voice self-study resources

CVoice 642-437 Quick Reference (eBook)-Coming January 2011

Cvoice Self Study Guide

Rough Cut Edition-Coming January 2011 (Rough Cuts provide online access to pre-publication manuscript)

Print and eBook Eidtions-Coming May 2011

CIPT1 642-447 Quick Reference (eBook)-Coming January 2011

CIPT1 Self Study Guide

Rough Cut Edition-Coming December 2010 (Rough Cuts provide online access to pre-publication manuscript)

Print and eBook Editions-Coming April 2011

CIPT2 642-457 Quick Reference (eBook)-Coming January 2011

CIPT2 Self Study Guide

Rough Cut Edition-Coming December 2010 (Rough Cuts provide online access to pre-publication manuscript)

Print and eBook Editions-Coming April 2011

TVoice 642-427 Quick Reference eBook-Coming January 2011

CAPPS 642-467 Quick Reference eBook-Coming February 2011

Mean while just check out this sample chapter taken directly from the CCVP CVOICE Self-Study Guide (3rd Edition). This sample chapter will discuss H.323 protocol stack and how to implement H.323 on gateways, MGCP stack and how to implement MGCP on gateways and SIP enterprise features and how to implement SIP on gateways. Read now.

For more information on CCNP voice please check this link.


October 20, 2010  6:01 AM

Cisco Introduces new CCNA Voice Exam, it is ICOMM 640-641!



Posted by: Yasir Irfan
CCNA Voice, CCNP, Cisco Career, Cisco Certifications, Cisco Introduces new Exams its CCNA Voice, Cisco Systems, Cisco Unified Communications Manager, Cisco Unified Communications Manager Express, Cisco Unified Communications solutions, Cisco Unified Presence, Cisco Unity Connection, CVOICE 642-436, ICOMM 640-641 exam, IIUC 640-460, Network Technologies and Trends

Cisco Systems announced the updates for its voice certification track. Now CCVP will be known as CCNP Voice sounds good!.

Cisco Systems introduces ICOMM  640-641 as the new exam for CCNA Voice certification.The newly introduced ICOMM  640-641 exam  will replace the existing IIUC 640-460 and CVOICE  642-436 exam for individuals working toward achieving the CCNA Voice certification. The last day to test using the IIUC #640-460 or CVOICE #642-436 exams is Monday, February 28, 2011.

The newly introduced ICOMM  640-641 exam will test the certification aspirers the architecture, components, functionalities, and features of Cisco Unified Communications solutions. It also tests the knowledge needed to perform tasks such as system monitoring, moves, additions and changes on Cisco Unified Communications Manager, Cisco Unified Communications Manager Express, Cisco Unity Connection, and Cisco Unified Presence.

In order to know more information regarding CCNA Voice Certifications please access CCNA Voice syllabus page.


October 18, 2010  5:05 AM

Juniper Networks Unveils Media Flow Publisher for Online Video Delivery



Posted by: Yasir Irfan
cable operators, high-quality video, Internet Protocol Television (IPTV), iPads, Juniper Network, Juniper Networks Unveils Media Flow Publisher for Online Video Delivery, Media Flow Controller, Media Flow Controller application, Network Technologies and Trends, New Orleans., premium video entertainment content, SCTE Conference, smart phones, tablet pcs, VXA Series Media Flow Engines, www.junipernetworks.tv., x86-64 servers

With Media Flow Controller Juniper Networks is extending its reach into Network Media business, In a latest press release Juniper Networks unveiled its  Media Flow Publisher, a Juniper Networks Media Flow Controller application, which facilitates the introduction of premium multi-screen video services. With Juniper Networks Media Flow Publisher, cable operators, Internet Protocol Television (IPTV) providers and content publishers can now more easily introduce innovative new services by delivering high-quality video content to a variety of end-user devices, while ensuring a superior user experience.

This is the era of iPads, tablet pcs, smart phones with an increasing wireless access is often driving the consumption of premium video entertainment content out of the living room. On-the-go consumers now expect access to a variety of content on any device at any time. Delivering premium content to multiple screens in the form of new services can represent a tremendous business opportunity for cable operators, IPTV providers and content publishers; however, it also presents a number of technical challenges.

Media Flow Controller can be deployed on industry-standard x86-64 servers, or purchased pre-installed on the VXA Series Media Flow Engines. Optional applications such as Media Flow Publisher can further increase the functionality and value of Media Flow Controller. /. A demonstration of Media Flow Controller’s adaptive streaming capability is available at: www.junipernetworks.tv.

Juniper Networks Media Flow Publisher will be demonstrated in booth 453 at the upcoming SCTE Conference, October 20-22 in New Orleans.


October 12, 2010  5:49 AM

Cisco Nexus Switches comes with built-in Wireshark



Posted by: Yasir Irfan
Cisco Nexus 7000 Series Switches, Cisco Nexus 7000 Switch, Cisco Nexus Switches, Cisco Nexus Switches comes with built-in Wireshark, Cisco NX-OS Ethanalyzer, Cisco Switches, Cisco Systems, command-line version, Linux, Network Technologies and Trends, T-shark, tcpdump, Wireshark

Wireshark is a great open source packet analyzer used for network troubleshooting installed in our laptops or desktops. What if you want to troubleshoot a problem in a Cisco Nexus 7000 Switch and your laptop doesn’t have Wireshark installed?  No worries Cisco Systems did a great job as the Cisco Nexus 7000 Switch comes with a built-in Wireshark, amazing isn’t it!

Cisco simply based their Cisco NX-OS Ethanalyzer on the command-line (cli) version of Wireshark, also known as T-shark. The syntax is very similar to tcpdump in linux, as demonstrated below with the following command

VDC-Admin# ethanalyzer local interface inband capture-filter test

In upcoming posts I will try to provide some tips and some useful commonly used commands  in Cisco Nexus 7000 Series Switches.


October 8, 2010  1:22 PM

Cisco unveils Umi



Posted by: Yasir Irfan
Cisco Systems, Cisco TelePresence, Cisco unveils Umi, hardware, HD television, high-definition camera, high-speed broadband internet, John Chambers, Middle East, ūmi, unlimited video, US, US-only launch, videoconferencing

Cisco’s Telepresence is entering home, thanks to Cisco’s systems “ŪMI” (pronounced as ‘you-me’). The latest revolution from Cisco Systems, ŪMI is a piece of hardware developed by Cisco Systems, which will allow people to connect and start using their HD television for videoconferencing.  Interesting isn’t it!, also you can establish video messaging and video recording, between ŪMI and any PC with a webcam and Google video chat.

Pic Courtesy: Cisco Systems

Those who want to enjoy by getting close with their friends and family members must need to ŪMI device including their friends and family members. The ŪMI comes with high-definition camera embedded microphone, a set-top box & remote. Users also need a high-speed broadband internet (approximately 3.5 Mbps) connection as well.

“Cisco is bringing people together, driving new video experiences that change the way we communicate, connect, and enjoy entertainment – in the home, at work, and on the go,” said John Chambers, chairman and CEO of Cisco. “Cisco ūmi will bring the unique telepresence experience into living rooms and change the way we are able to be together with family and friends. We envision a future where technologies like this will play a role in connecting consumers with businesses to enable the delivery of new services, ranging from education, to health care, to financial services – to the home.”

Ūmi is due for a US-only launch on 14th November, and is expected to cost around $599 for the hardware plus a $25 monthly subscription that allows unlimited video calls.

Looking forward to see the ūmi service operational in the Middle East as well.


October 7, 2010  10:20 PM

Review for “31 days before your CCNA Exam”. A title worth reading.



Posted by: Yasir Irfan
31 days before your CCNA Exam, Allan Johnson, CCNA skills, CCNA Skills review and practice, Cisco CCNA 640-802 Certification exam, Cisco Network Academy, Cisco Network Academy students, Cisco Packet Tracer, Cisco Press, EIGRP, Exam day and post exam information, frame-relay configuration, GNS3 graphical network simulator, inter vlan routing, Jamie topology, Port security, Review for 31 days before your CCNA Exam, STP, VTP, which covers topics like VLAN configuration

In short an interesting title, exclusively written for the Cisco Network Academy students, who are preparing for the Cisco CCNA 640-802 Certification exam. The author Allan Johnson takes a very broad look at practical way to make you understand the concepts in 31 days in a very concise way.  He has emphasized on concepts and terminologies used in Cisco CCNA 640-802 Certification exam in an interesting way which definitely helps you to summarize your learning.

Pic Courtesy: Cisco Press

Although the title “31 days before your CCNA Exam” aims at Cisco Network Academy students, but it can be used for the Cisco CCNA 640-802 Certification aspirers who does self study.

The author Allan Johnson divided the title suiting in to 31 chapters, which are so concise you can finish each chapter in an hour. The cream of the title  “31 days before your CCNA Exam” is the section called “Exam day and post exam information” which gives the CCNA Certification aspirers guidelines on what to expect after the completion of exam as well as what they should do if they fail to pass the exam on first attempt. One more section that I really liked is “CCNA Skills review and practice” which helps you to practice the CCNA skills which includes most of the CCNA 640-802 exam configurations skills in one topology, which covers topics like VLAN configuration, frame-relay configuration, inter vlan routing, EIGRP,VTP, port security , STP. You can practice those topologies either on Cisco Packet Tracer or GNS3 graphical network simulator.

Overall the title “31 days before your CCNA Exam” is a true gem, but cannot be a only source for passing CCNA 640-802 exam, this title is good for the some one who is looking for quick reference on CCNA 640-802 exam topics in an well organized way. I thank Cisco Press and Jamie in particular for providing me the copy of “31 days before your CCNA Exam”


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