DNSSEC (DNS Security Extensions), a more secure DNS protocol is to be implemented on May 5th. With the rise of DNS Poisoning and Man-in-the-Middle attacks rising, the Domain Name System will be going to a secure version of DNS next month. The changes will add digital signatures to the DNS protocol. This will reduce the […]
Archives for April 2010
Routing Protocols Overview
There are different techniques and methods for maintaining accurate routing information, thus different types of routing protocols were invented over the years. The following post is intended to offer you an overview of the different types of routing protocols currently available. Distance Vector / Link State The above terms refer to the algorithms that govern […]
Routing Redistribution on Cisco Routers (Cheat Sheet)
In order for two Layer 3 devices (routers or layer 3 switches) to be able to exchange routing information, it is necessary to use the same routing protocol, such as RIP, EIGRP, OSPF, BGP, etc. Different routing protocols, or protocols configured differently (eg different EIGRP autonomous system) do not exchange information. However, when a device […]
This is the new domain home for Cisco-Tips
Hello there, this is Harris Andrea. Today I have redirected my older blog Cisco-Tips.com to its new domain home which is the website you are viewing now (NetworksTraining.com). Please update your bookmarks accordingly. I have configured a permanent 301 domain redirect (using .htaccess file) for the whole cisco-tips.com website and I have moved the old […]
How to Recover a preshared key of IPSEC VPN on Cisco ASA
One of the ways to configure authentication between two Cisco ASA firewalls having a site-to-site IPSec VPN tunnel between them is to configure a pre-shared key under the tunnel group attributes. This is actually the most common implementation of IPSEC lan-to-lan authentication that you will find in most real life networks. The pre-shared key must […]
Understanding the Transport Layer and Port Numbers CCNA Tutorial
This is another CCNA exam preparation tutorial about the Transport Layer of the TCP/IP suite. Understanding the purpose and functionality of the Transport Layer (Layer 4 in the OSI model) is fundamental for understanding how data is transmitted in network environments. When preparing for the Cisco CCNA 200-301 exam, you need to have strong knowledge […]