My Netwok Dictionary

Access Layer

The access layer of the network is the point at which each user connects to the network. This is the reason why the access layer is sometimes called job layer, layer or user desktop. The users and the resources that they need more frequent access, are available locally. Traffic to and from local resources is confined between the resources, switches and end users. In the access layer we can find multiple user groups with their corresponding resources. In many networks can not provide users with local access to all services, including database files, centralized storage or telephone access to the Web. In these cases, the traffic of users who demand these services are off to the next layer of the model: the distribution layer. Read the rest of this entry »

Installing the Cisco Unified CME Router

First make sure you have installed your router an IOS suitable for CME.
The CME software includes a set of files, divided into the following categories.

Basic files: These are the core files that are required to operate the CME. These files also include firmware that allows Cisco IP phones to operate.
Gui files: These files make it possible to control the CME web.
XML template files: These files determine the control structure of Web pages for the configuration of the CME.

Changing these files allow you to create different levels of administration.

• MOH files: audio files are used for Music on Hold (MOH)
• Script files: Defined as Various Tool Command Language (Tcl) script files to provide advanced functions in the CME (eg automatic call distributor ACD)
• Miscellaneous files: There are additional files that allow you to customize the ring tones or background different models Cisco IP Phones

Read the rest of this entry »

A broadband connection allows the introduction of broadband Internet at home. And with wireless LAN - also called “Wi-Fi” (Wireless-Fidelity, abbreviation constructed along the lines of “Hi-Fi”) - you can have this access on various computers scattered throughout the house, even close, without cable. And with the Wi-Fi products today, sharing an Internet connection is not only inexpensive and easy to use but also safe. This guide shows how to distribute high-speed Internet access to multiple laptops or desktop and how to build a secure network.

To set up a Wi-Fi, you need
a wireless router (top in photo) and an adapter for each system connected
- PCI card (left) for a desktop computer, PC Card (right) for a laptop.

The heart of a wireless LAN is a router. For example, we used the DI-624 AirPlus Xtreme G 802.11g D-Link. We also need a wireless adapter for each system that could connect to the network. We set up to do a PC Card DWL-G650 on a laptop running Windows 2000 and a DWL-G520 PCI adapter on a desktop computer using Windows XP Home Edition. As for the main computer, connected to the router via an Ethernet cable, it was under the control of Windows XP Professional edition.

Read the rest of this entry »

Mobility
Wireless networks provide users with LAN access a real-time information anywhere within the organization or public environment (limited area) in which they are deployed.

Simple and Fast Installation
The installation of a WLAN is fast and easy and eliminates the need to run wires through walls and ceilings. Read the rest of this entry »

AAA is a combined security under the Authentication, Authorization and Accounting is. It is around the three main tasks of AAA.

Simplified representation of the functioning of AAA

A user (client) wants to take a service to complete. A network access server (NAS) provides this service or access to service (network). The client accesses the NAS. The NAS asked its AAA server, the information on the eligibility for use of services and provide all records. The AAA server confirms the release or reject. Due to the authorization of the NAS is the client free access, or rejects it.

Authentication
Authentication means verifying the identity. For example, with username and password. Sticking point for each authentication is the transmission of username and password. If they are not encrypted, then it is possible that an attacker spying on both, and abused for one’s own authentication. Read the rest of this entry »

IEEE 802.3 is a whole range of techniques that are standardized separately. Their names resulting from: data rate transmission method, segment, and length or cable type

For this reason, this list is not complete. In the further description, only the most important and commercially successful Ethernet standards are explained.

10Base5 / Thick Ethernet / Yellow-Cable

• Transmission Speed: 10 Mbps
• Physical Structure: Bus
• Maximum length of a segment: 500 m
• A maximum of 100 stations per segment
• Minimum distance between two stations: 2.5 m
• Network Cables: Coaxial

10Base5 is a method of Ethernet with a bandwidth of 10 Mbit / s to operate on a thick coaxial cable (RG-8A / U) (Thick Ethernet). The maximum cable length of a segment is 500 meters. The two ends of the cable must be terminated with 50 ohm terminators. 100 calls per segment may be connected. The transceivers in the stations must maintain a minimum distance of 2.5 meters. The respective branch lines allowed to be not longer than 50 meters long. Read the rest of this entry »