Network technologies and trends:

Cisco


August 23, 2008  6:04 AM

Discover Cisco Network Assistant (CNA)



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco Network Assistant, Cisco Tips, Network Inventory, Network Troubleshooting, Networking, Routers, SNMP, Switches

Cisco Network Assistant (CNA) is a PC-based graphical network management application which is free tool included when a new Cisco Switch is...

August 20, 2008  6:22 AM

What is Service timestamps logging, and how it can be configured Cisco Switch or a Router?



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3745, Cisco 6500, IOS commands, Router Troubleshooting, Service timestamp, Switches, Syslog

Logging is a quite essential part of a secure network configuration. Logging not only helps the Network Administrators to identify the issue while troubleshooting, also enables them to react to intrusion attempts or Denial-of –Service attacks....


August 17, 2008  5:55 AM

What is the Link-flap error in Cisco Switches?



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco 6500, Err-disable, Layer 1 issues, Link-Flap, Switches

Link flap means that the interface continually goes up and down in a Cisco Switch. The interface is put into the errdisabled state if it flaps more than five times in 10 seconds. The common cause of link flap is a Layer 1 issue such as a bad cable,...


August 9, 2008  6:35 AM

Cisco’s Come Back Program



Posted by: Yasir Irfan
CCDA, CCIE, CCNA, CCNA Security, CCNA Voice, CCNA Wireless, CCNP, Certifications, Cisco, Cisco Learning, Cisco Tips, Pearson

Now there is a good news for networking professionals who are aspiring for Cisco Certifications.  You can retake the exams for free under Cisco “Come Back” program. Cisco and Pearson VUE have partnered to give networking professionals the opportunity to re-invest in...


August 5, 2008  6:52 AM

Show Commands in Cisco Routers and Layer 3 Switches(Most commonly used)Series -2



Posted by: Yasir Irfan
Cisco, Cisco 3560, Cisco Tips, IOS commands, Networking, Router Troubleshooting, Routers, Show commands, Switches

In my previous post I tried to cover some of the show commands which are...


August 2, 2008  6:43 AM

Show Commands in Cisco Routers and Layer 3 Switches(Most commonly used)Series -1



Posted by: Yasir Irfan
ASA/PIX, Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 525, Cisco 6500, Cisco Tips, IOS commands, PIX 525, Router Troubleshooting, Routers, Show commands, Switches

Some of the widely used commands in Cisco routers are just simple unavoidable, among the most commonly used commands in a Cisco Routers are “show” commands. These commands are essential to Network Administrators. Here is a list of those commands. I...


July 30, 2008  12:59 PM

Network Inventory and Configuration Management



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3745, Cisco 6500, Cisco Tips, Configuration Management, Network Inventory, Networking, Open Source, Routers, SNMP, Switches, ZipTie

We all know much about Kiwi Syslog Software.  For many years I am using Kiwi Cat tools for configuration management and automate many of daily tasks. Kiwi Cat tool really helped me to perform many tasks like configuration backup, telnet, SSH and much more....


July 20, 2008  8:53 AM

How to configure multiple interfaces in Cisco Switches



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco 525, Cisco Tips, Networking, Switches

Configuring individual interfaces with same parameter on a Cisco Switch can be time consuming. In order to overcome this you can use following commands, from the global mode enter config t ITKE#configure t ITKE(config)# then issue interface range fastEthernet 0/1 -24 ITKE(config)#interface...


July 17, 2008  9:45 PM

How to display the configuration of a single interface in Cisco Router or a Switch



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 6500, Cisco Learning, Cisco Tips, Networking, Routers, Switches

Displaying configuration of a single interface can be a time-consuming task if your router or a switch  has extremely long configuration. In this case, the interface keyword of the show running-config command becomes extremely useful. For example, the show running-config interface serial 0/1 ...


July 15, 2008  6:36 AM

How to Secure SNMP in Cisco Switches and Routers



Posted by: Yasir Irfan
Access List, Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 6500, Cisco Learning, Cisco Tips, Networking, Routers, SNMP, Switches

This article focus on the ways how we can secure SNMP access in Cisco Switches and Routers Simple Network Management Protocol (SNMP)   uses the default UDP port 161 for general SNMP messages and UDP port 162 for SNMP trap...


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