My Netwok Dictionary

Router (config) # router IGRP 100
Router (config-router) # network 192.168.1.0
Router (config-router) # network 200.200.1.0
Router (config-router) # variance?
<1-128> Metric variance multiplier
Router (config-router) # variance 2
Router (config-router) # traffic-share?
Share inversely proportional to balanced metric
Among min All traffic shared min metric paths Read the rest of this entry »

Enable OSPF using the command:

Router (config) # router ospf process-id
Router (config-router) # network address wildcard-mask area area-id

Where:

process-id is the number that is used internally to identify if there are multiple OSPF processes running inside the router.

network identifies the directly connected networks, identified by its corresponding wildcard mask

area for each network, you must also identify that area belongs. The main area or the area 0 backbone. Read the rest of this entry »

The boot system command specify the name and location of the IOS image to load.

Router (config) # boot system flash [filename]
Tells the router to boot using the IOS which is located in flash memory.

Router (config) # boot system rom
Tells the router to look for IOS in ROM

Router (config) # boot system tftp [filename] [dirección_servidor]
Tells the router to boot the image has to load IOS from a TFTP server.

Importance of the show version command

When a router starts, it checks the virtual configuration register to determine (among other things) how should enter after the start, where to get the image of the software and how to manage the configuration file in NVRAM.

This 16-bit register controls functions such as baud console port, the loading of software, enabling or disabling the interrupt key during normal operations, the default multicast address and establish a source to boot the router.

The show version command displays information on hardware and IOS router, on the last line shows the configuration register. The registry value for a normal boot sequence must be 0 × 2102 (hexadecimal). Read the rest of this entry »

1. It’s harder than it looks to achieve reliable connections.
2. Your cables and test them until you get good connections all the time.
3. When cutting the outer cable jacket do it very carefully, avoiding cutting the insulating cover of individual drivers, as this can cause connectivity failures.
4. Exhibit up to 25 mm of the individual cables in preparing the cable for connection.
5. Unravel the twisted pairs.
6. Align individual cable connection according to the standard you want. Flatten so that they are rights.
7. Trim the excess at the ends of the wires. The cut should be accurate to 90 degrees with respect to cable and 12.5 mm from end of cable jacket. This is a very critical step. If the cables are not fully aligned in a square cut, may not make contact.
8. Make sure the cables are equal in length to align and press and are not visible outside the plastic when you enter the connector.
9. Carefully slide the prepared cable into the connector, ensuring that the end of all cables reach the bottom of the connector. The lining of the cable connector should enter an approximate distance of 4.7 mm.
10. Using pliers, make the connection by a single operation firm tight.
11. Remember that the insulation of each cable must be pressed firmly with pliers punches placed in the rear of the connector. Failure to do this well, the connection will be very fragile and it is likely to break with normal use.
12. Always test the cable before installation.
13. The connector is the critical part of the circuit, so always use the best quality connectors possible.

Wireless devices are very popular and are used in different ways and for different purposes. Examples of use would be the AM and FM radio, cordless phones, cell phones, satellite communications and communication WiMAX (Worldwide Interoperability of Microwave Access) and Wi-Fi. These techniques use a wireless frequency spectrum authorized or which does not require a license.

Among the hottest technologies in the market, Wi-Fi and WiMAX are showing a huge increase in deployment of products and services. This article will highlight the difference between the two technologies according to how they relate to standards development and positioning of the solution. Read the rest of this entry »

VRF (Virtual Routing and Forwarding) is a convenient and efficient method for dividing a VLAN when it reaches a size which can no longer be managed as a single domain.

Virtual networks are the basis of virtual systems, going to connect servers and storage, which together form the so-called just the virtual system. But virtual networks - and therefore the virtual systems - are often limited to a single building. Virtual technology routing and forwarding (VRF) allows the creation of a single virtual system that contains the components located in multiple locations.

Virtual systems are becoming more widespread as a result of cost reductions and allowing them flexibility:

• Virtual networks allow administrators to divide a physical link into several virtual links. Each of
  these is completely isolated from others. Typically, virtual network traffic is dedicated to a specific
  application or a specific group of users.
• How changes in the mix of applications and process loads during the day, changing patterns of
  network traffic. Virtual network administrators can vary the fraction of the bandwidth on a link
  assigned to each application. In addition, several physical links can be “united” to provide adequate
  bandwidth in those cases where no physical connection would be sufficient for this purpose.

Techniques for Division of Local Area Networks (LAN) in multiple virtual networks have been developed and standardized by IEEE in the 90s. These techniques have been adopted on a large scale. Read the rest of this entry »