Archives by: JMCristobal

JMCristobal

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JMCristobal Posts

VTP – VLAN Trunking Protocol

Enterprise Infrastructure
VTP uses Layer 2 trunk links to communicate VLAN information within a group of switches. VTP manages the addition, deletion, and renaming of vlan names by sending VTP ...
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DTP – Dynamic Trunking Protocol

Enterprise Infrastructure
DTP is cisco’s proprietary protocol for negotiating trunking mode between two switches. A trunk link can only be negotiated between two switches if both belong to the same ...
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VLANs y Trunk Ports

Enterprise Infrastructure
The video is in Spanish only Trunk ports can carry two or more VLANs over a single switch port and are helpful when switches are connected to other ...
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VLANs y Access Port

Enterprise Infrastructure
The video is in Spanish only Virtual LAN – VLAN A VLAN defines a broadcast domain; they help us to create logical networks within the same switch with ...
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UDLD – UniDirectional Link Detection

Enterprise Infrastructure
UDLD is a Cisco proprietary Layer 2 protocol that monitors the state of a port to validate bidirectional communication. Recall that each port in a switch is bidirectional, ...
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LLDP – Link Layer Discovery Protocol

Enterprise Infrastructure
LLDP is similar to the CDP protocol but is based on the IEEE 802.1ab standard. The great advantage of LLDP is that it works on multi-vendor networks. Information ...
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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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