ديفيدات تعليمية في الشبكات

**منازار** · 27-06-2010, 17:12

CCIE – Network Infrastructure | 866 Mb
Genre: eLearning
Telehouse DatacentreAn important, yet frequently overlooked, consideration when choosing an Internet Service Provider (ISP) is the quality and physical location of its network infrastructure.Designed and implemented for maximum resilience and redundancy our self owned network is physically located at multiple Telehouse and TeleCity Group Data Centres in London.The combination of redundancy and state-of-the-art monitoring, backed up by onsite staffing 24 hours a day, ensures our customers websites, servers and connectivity solutions remain online when they need to be, around the clock, throughout the year.

Network Overview

The network has been built and deployed using state of the art Cisco Routers by our own in-house Network Administration Team, utilising redundant fibre based connections and multiple sites we now have over 2Gbps of uncontended transit connections and peering links.
Namesco Network Diagram

Transit is currently provided by: BT and Tinet
Interlinks are at the Internet Exchange Points: LINX and LoNAP
Additionally there are private peering agreements.
Telehouse and TeleCity Group Data Centres

Our view is that the best place for an ISP to locate their network is in the UK’s purpose built Internet Data Centres. In these, all the UK’s and most of Europe’s major ISPs locate their equipment allowing the fastest possible speeds for connections and the best facilities in terms of security, environmental control, power resilience – through multiple National Grid connections and on site generators with UPS battery systems, fire detection and suppression, water leak detection, and also offer the choice of data carriers from the various UK, European and Global transit providers.

Utilising multiple data centres allows us to have site resilience for our core services, even in the very unlikely event of a data centre failing, we and therefore our customers, can continue to operate.
BlueSquare Data Centre

The new BlueSquare Milton Keynes data centre is one of the very few tier IV data centres in the UK. It was originally purpose built to the highest standards for a leading German bank, with BlueSquare taking over the site in March 2008. BlueSquare completely refitted all of the interior and exterior systems to a very high N+N redundancy level.

The site benefits from dual diverse substations, as well as multiple diverse dark fibre providers offering an excellent choice in connectivity.
Services Provided to Customers

As an Internet Service Provider we provide a number of services to our customers, including:

DNS Platform: DNS is the keystone for the Internet, and with our background in domain name registration, an area of the business we take very seriously. For Authoritive DNS, we operate an advanced DNS solution utilising three DNS servers in different locations and on different networks. For customer use, we also operate a number of Resolving or Caching DNS servers, ensuring only the most current DNS record for any domain name is returned and making DNS resolution as quick as possible for our customers.

Email Platform: Our email platform cluster currently handles nearly 3 million emails every day which are passed through both anti-spam and anti-virus filters before being stored on our state-of-the-art storage platform offering over 15TB of storage space. Access to stored email is available via POP3, WebMail and IMAP.

Hosting Platform: All our shared-server websites are hosted on two state-of-the-art server farms, with one cluster for our Linux hosting and another for the Windows hosting. Each server farm is composed of a cluster of servers behind a series of redundant load-balancers. This allows any of the servers in the cluster to be taken out of service for maintenance without affecting the performance of any hosted website.

Data Backups: All three of our major platforms storing customer data are backed up both on the fly and daily to independent and resilient devices.

Connectivity Platform: For our ADSL and SDSL Broadband services, we utilise multiple BT-Central Connections (pipes) from BT wholesale directly linking our network to all the xDSL enabled exchanges around the country. By having our own pipes it means we can completely control the speed and services offers to customers ensuring a contention free Internet experience. For Dialup services we operate our own dial platform for termination of inbound calls, this means we are in complete control of all the connections, and by terminating the calls on our own network we can minimise latency.

Dedicated Servers: All dedicated server solutions for customers are deployed using the same grade of rack-mountable, high capacity servers used for our own services. With equipment sourced from a number of manufacturers including Dell, HP and Super Micro.

Filtering: In accordance with ISPA best practice guidelines on declaration of in use filtering technologies, we filter incoming email using the following services:
Zen Service from www.spamhaus.org

We do not accept email that meets the criteria of these services.

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**منازار** · 27-06-2010, 17:13

**منازار** · 27-06-2010, 17:14

Wireless Networking Video Tutorial Session 1,2,3,4,5
624MB + 685MB + 696MB + 702MB + 695MB
5 Sessions – 15 Hours of Interactive Training

The popularity of wireless networks is exploding, and with it, demand for trained wireless IT professionals. In the Wireless Networking course from LearnKey, you’ll learn the fundamentals of wireless LANs from a vendor-neutral perspective. Expert instructor Michael Storm takes you through radio frequency (RF) technologies, industry standards, site surveys, wireless security issues and much more. At the conclusion of this course you’ll be prepared to implement, manage, and troubleshoot wireless networks, and be prepared to pass the Certified Wireless Network Administrator (CWNA) exam.

Session 1
Section A: CWNP Introduction
Section B: Wireless Application
Section C: Radio Frequency Technology
Section D: Antennas
Section E: RF Mathematics
Section F: Spread Spectrum

Session 2
Section A: Spread Spectrum Technologies
Section A: Spread Spectrum Technologies
Section B: FHSS vs. DSSS
Section C: Wireless Access Points
Section D: Access Point Features
Section E: Client Devices
Section F: Infrastructure Devices
Section G: Antenna Types

Session 3
Section A: Tuning Antennas
Section B: Power Over Ethernet
Section C: RF Accessories
Section D: Organizations
Section E: Locating Access Points

Sesion 4
Section A: Authentication
Section B: Service Sets
Section C: WAN Communication
Section D: Troubleshooting

Session 5
Section A: WEP/TKIP
Section B: Security Options
Section C:Wireless Attacks
Section D: Corporate Security Policy
Section E: Site Survey
Section F: Preparation

الموضوع: ديفيدات تعليمية في الشبكات

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ديفيدات تعليمية في الشبكات

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ديفديات تعليمية في الانجليزية (مستويات)English Today Lower Intermediate

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