Archives by: JMCristobal

JMCristobal

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JMCristobal Posts

CDP – Cisco Discovery Protocol

Enterprise Infrastructure
CDP is a Cisco proprietary protocol used to collect information from devices on the network that is directly connected, such as hardware, software, device name and more. CDP, ...
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Errdisable recovery

Enterprise Infrastructure
Switches can automatically detect error conditions on each of their ports. When an error is detected, the switch puts the port in “errdisable” state and is disabled. This ...
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Managing MAC Addres Table

Enterprise Infrastructure
Switches operate at layer 2 of the OSI model (Data Link). It sends frames based on destination MAC addresses (Media Access Control) found within the same frame based ...
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Basic information about my Fortigate unit

Basic information about my Fortigate unit
These days, I have had to configure and monitor some Fortigate equipment, most of it is done via GUI, but it is necessary and practical to use the ...
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Macro switchport host – Cisco IOS

Enterprise Infrastructure
A few days ago, when I was configuring the ports of a switch and reviewing the operation of STP, I found in the CLI the command “switchport host”, ...
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“Default interface” command – Cisco IOS

Enterprise Infrastructure
The “default interface” command is used to return an interface to its default configuration; its implementation is in global configuration mode, and the interface to be modified is ...
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IPv4 address classes

IPv4 address classes
With the implementation of the Internet, its designers decided to create classes of networks based on the size of the network; each network address belongs to a specific ...
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IP Addressing

IP Addressing
IP addressing is one of the most challenging and essential topics in TCP/IP. It is a crucial function for Layer 3 protocols because IP addressing was designed to ...
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TCP/IP MODEL

TCP/IP MODEL
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 of its popularity, flexibility, compatibility, ...
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Enable SSH in Cisco IOS router

Enterprise Infrastructure
Telnet is a protocol that does not use encryption, where everything that passes through it is displayed in plain text; for security reasons, the SSH (Secure Shell) protocol ...
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Request for Comments (RFC)

Request for Comments (RFC)
As its official home page puts it, the “Request for Comments” “contains technical and organizational notes about the Internet. They cover many aspects of computer networking, including protocols, ...
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Operating Systems – OS

Operating Systems – OS
An operating system (also known as an “OS”) is the main software or set of programs in a computer system that manages hardware resources and provides services to ...
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IPv4

IPv4
The Internet Protocol version 4 (IPv4) offers hierarchical addressing for packets carrying data, video, etc. As mentioned above, it is based on the binary number system, only comprised ...
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