My Netwok Dictionary

The magic numbers

Certainly in more than one occasion you’ve had need to rebuild your Internet connection and you have had to struggle with lots of numbers and strange concepts: DNS, network mask, ip, gateway … however, are the concepts of network under TCP / IP more essential. On this page you’ll see its meaning.

IP Address

The number IP is the logical address that identifies your computer on a network (either local or external). This direction is one for each team in the world, or only within each local network, and the call because only logical direction to know the IP, any router is capable of directing data to the target machine (or another router that is probably capable of sending data to the target computer.

If your computer does not connect directly to internet, no need to have a unique IP number worldwide, but only at the level of the subnet that is integrated. So, if you have a home network with three teams, you only need one public IP (only) for the computer that connects to the Internet, having private IP subnet level for each computer or device (private IPs that are unique to each subnet) . For example a private IP address of a class C network would be 192.168.0.1 for the internet gateway, 192.168.0.2 for the following machine, etc. Read the rest of this entry »

Route summarization or aggregation,  is a mechanism used to design networks that are more flexible and perform better. With route summarization  or aggregation, in a hierarchical routing infrastructure, one route in a routing table represents many routes.

Although some routing protocols summarize only at the boundaries of major network numbers, others support route summarization (aggregation) at any bit boundary. Variable-length subnet masks enable routing protocols to summarize on bit boundaries.

Read the rest of this entry »

A network protocol is a standard set of rules standard-standard, which specifies the method to send and receive data between multiple computers.

No single network protocol, and may coexist on the same computer multiple protocols installed, it is possible that a computer belonging to different networks.

This variety of protocols can be a security risk: each network protocol installed on a Windows system is available for all network adapters in the system, physical (network card or modem) or software (VPN adapters). If network devices or protocols are not properly configured, we can be giving unwanted access to our resources.

The simplest safety rule is to have installed the necessary number of protocols, both now and in most cases should suffice to only TCP / IP. Read the rest of this entry »

By Diane Teare, Catherine Paquet.

Published by Cisco Press.

Series: Self-Study Guide.

Description:

* Provides a thorough introduction to campus switched network construction, support, and security
* Explains the fundamentals of multilayer switched network design and specific design features such as Spanning Tree Protocol, quality of service (QoS), and high availability
* Covers virtual LAN (VLAN) and InterVLAN Routing implementation
* Incorporates wireless client access and configuring campus switches to support voice technologies
* Uses extensive configuration examples and diagrams to solidify the explanations of topics
* Presents self-assessment review questions, configuration exercises, chapter objectives and summaries, and study tips to ensure information recall

Dwonload:Building  Cisco Multilayer Switch Network(BMSN)

The process to recover a password (password recovery), which actually replaces only the back, the Cisco routers varies depending on the series. The commands and the method of this tutorial are for the following models:

Cisco 2000 Series Router
Cisco 2500 Series Router
Cisco 3000 Series Router
Cisco 4000 Series Router Cisco AccessPro
Cisco 7000 Route Processor (RP)
Cisco AGS + Routers
Cisco IGS Router Series
Cisco STS-10x Access Servers Read the rest of this entry »