Recent Posts

Enterprise Infrastructure

Errdisable recovery

By JMCristobal
January 7, 2021
Switches can automatically detect error conditions on each of their ports. When an error is detected, the switch puts the port in “errdisable” ...
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Enterprise Infrastructure

Managing MAC Addres Table

By JMCristobal
January 4, 2021
Switches operate at layer 2 of the OSI model (Data Link). It sends frames based on destination MAC addresses (Media Access Control) found ...
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Basic information about my Fortigate unit

Basic information about my Fortigate unit

By JMCristobal
September 5, 2017
These days, I have had to configure and monitor some Fortigate equipment, most of it is done via GUI, but it is necessary ...
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Enterprise Infrastructure

Macro switchport host – Cisco IOS

By JMCristobal
July 6, 2017
A few days ago, when I was configuring the ports of a switch and reviewing the operation of STP, I found in the ...
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Enterprise Infrastructure

“Default interface” command – Cisco IOS

By JMCristobal
June 27, 2017
The “default interface” command is used to return an interface to its default configuration; its implementation is in global configuration mode, and the ...
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IPv4 address classes

IPv4 address classes

By JMCristobal
April 26, 2017
With the implementation of the Internet, its designers decided to create classes of networks based on the size of the network; each network ...
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IP Addressing

IP Addressing

By JMCristobal
April 26, 2017
IP addressing is one of the most challenging and essential topics in TCP/IP. It is a crucial function for Layer 3 protocols because ...
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TCP/IP MODEL

TCP/IP MODEL

By JMCristobal
April 26, 2017
Today’s most popular protocol in use is the Transmission Control Protocol/Internet Protocol (TCP/IP). Currently, the Internet and most enterprise intranets use TCP/IP because ...
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This website is free and educational. Contains my thoughts and ideas, which may not represent the thoughts of the various technologies mentioned here. All product names, logos, and illustrations are copyright/trademarks of their respective owners.
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