Continuing our series of posts on IP Telephony and VoIP, here is Part 3 of the tutorial: Is IP Telephony Implemented Easily ? Over time, most companies have acquired the expertise to implement IP Telephony solutions, either on existing corporate networks or from scratch. The main advantage to implementing VoIP applications is that they rely […]
IP Telephony and VoIP Tutorial-Part 2
Continuing our series of posts on IP Telephony and VoIP, here is Part 2 of the tutorial: Can an IP Telephony System be connected to the public telephone network There are special voice gateways which can connect an IP Telephony system with the public switched telephone network (PSTN) or other telephone networks. Using the voice […]
How to choose the best Cisco Certification for your career
When it comes to the world of certifications there are many to choose from. It doesn’t matter what area of expertise that you are going in, there will always be sub sections that you will have to know more than others. It is the same in technology. When a company hires you for a tech […]
Cisco Switch Network Design
I was browsing the Cisco support forum the other day and found the following question post which is about designing a Cisco switched network. Some useful answers are given, so I thought I would repost here for my blog readers. You will find useful tips about switch port dimensioning, redundancy etc. I Hope you find […]
Forwarding a DHCP Request using Cisco ip helper-address command
DHCP, as we all know, is a broadcast protocol (shame on you if you don’t know that already :) !!) which normally works only on the same Layer 2 broadcast domain. Does this mean that you need to have your DHCP Server connected to the same network subnet as the DHCP clients? If this was […]
Most Popular Blog Posts for 2009
As the end of the year is almost here, I have decided to make a round-up of my blog posting activity for year 2009. I have gathered the 3 most popular posts for my blog in 2009 and listed them below. It seems that anything related with Cisco ASA Firewalls is very popular. This is […]
Trainsignal CCNA and CBT Nuggets CCNA Training-Two Great Options
In my workplace (I work in an ISP provider in Europe) we always encourage junior network engineers to follow a Cisco certification path, either through the Routing and Switching path or other important technology paths such as network security and VoIP. I have been in this industry for more than a decade and I firmly […]
VPN Config Generator-Software to create Cisco VPN Configurations
For most network engineers, one of the most difficult and tricky features to configure on Cisco equipment is to properly setup a VPN communication network. I have realized that from the numerous emails and questions I get almost every day from readers of my blog and in my workplace as well. Cisco is one of […]
Cisco Router Password Recovery-How to recover cisco router lost password
One of the most frustrating moments as a network administrator is when you desperately want to log on to a Cisco router and you try all possible passwords you have with no success. Fortunately there is a Cisco password recovery procedure for IOS routers which you can follow and bypass password control in order to […]
Cisco ACE Web Application Firewall Appliance
I was reading a security statistics report the other day and it seems that web vulnerabilities take up the majority of the pie. SQL injections, Cross Site Scripting, Code injections etc are found everywhere in web applications. Unfortunately secure coding (not only for HTML but for any software application) is not yet widely adopted, so […]
CCNP Certification-Two Essential Study Resources to pass your CCNP Exams
So, I guess you have already passed your CCNA exam and you have started looking up higher on the “ladder” of Cisco Certifications. Congratulations. The next big step is to earn the Cisco CCNP certification, which will promote you into a prestigious group of professionals who have all the knowledge and competency to work on […]
Cisco IOS jumps from version 12 to version 15
The latest Cisco IOS version was 12.4 until recently when Cisco IOS version 15.0 was introduced. Have you noticed the jump from version 12 to 15? Do you wonder why versions 13 and 14 were skipped? Well, rumors say that Cisco avoided those version numbers because 13 is considered unlucky in the Western Culture and […]
Cisco Launches SA 500 Series Security Appliance
Cisco announced a new security appliance model, the SA500 series, which is focused for the small business market. Cisco tried to fill the gap of the UTM (Unified Threat Management) appliance market in which other competitors (such as Fortinet, Checkpoint etc) were already ahead. Following the philosophy of the UTM appliance, the SA500 offers an […]