Monthly Archives: January 2012

Default STP Behavior on Cisco Switches

In a prior blog, Functionality of Layer 2 Switches/Bridges, I discussed the core functionality of layer 2 switches. In this blog, I hit upon the Spanning Tree Protocol (STP) used on layer 2 switches to prevent loops. As mentioned before, … Continue reading

Posted in Cisco, Labs, Networking, Protocols, Technology | Tagged , , , , , , , , , , , , , , , , , , , , , , , , | 1 Comment

The Rise of the Hybrid Cloud

As many organizations move their corporate services to private clouds to cut costs, enable rapid provisioning of resources, enable advanced monitoring, and increase up-time, I believe we will see a continuous uptake of solutions which tie private cloud services and … Continue reading

Posted in Business, Technology, Technology, Virtualization and Cloud Computing | Tagged , , , , , , , , , , , , , , , , | Leave a comment

How to Transfer Your Putty Settings Between PCs Running Windows

I can’t tell you how many times I’ve had people ask me how they can export their Putty settings. For those of you who have been completely in the dark for the last decade, Putty is a Telnet and SSH … Continue reading

Posted in Applications, Hacks, Networking, Operating Systems, Technology, Tips & Tricks, Windows, Windows 7, Windows Server 2008 R2 | Tagged , , , , , , , , , , , , , , , , , , , , , , | 8 Comments

Cisco – Filtering Unwanted Packets with Standard Access Lists

Access lists (ACLs) are basically statements that packets are compared against for the purpose of taking some action if a match occurs. After an access list is created, it can be applied to inbound or outbound traffic; in some cases … Continue reading

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Perl – Changing the Input Line Separator and Using the “chomp” Function

In this blog I demonstrate how you can change the input line separator in Perl and use Perl’s “chomp” function. Note, the input line separator is operating system dependent; see the following prior blog of mine where I discuss this … Continue reading

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Perl – Uppercase to Lowercase Conversion via the Translation Operator

Perl’s translation operator provides a way to substitute one group of characters for another. In the below script I demonstrate how easy it is to use the translation operator to convert standard input from the command prompt from uppercase letters … Continue reading

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OSPF Explained and Useful Troubleshooting Commands

Open Shortest Path First (OSPF) is an open standard link-state routing protocol that supports multiple equal-cost routes to the same destination (four by default). OSPF constructs a shortest path tree and then updates the routing table with the best paths. … Continue reading

Posted in Cisco, Labs, Networking, Protocols, Technology, Troubleshooting | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , | 3 Comments