service

Little about Organizational Units

January 26, 2011

An Overview of Organizational Units (OUs) An organizational unit (OU) is a container that is used to logically organize and group Active Directory objects within domains. OUs are not part of the DNS namespace. They are used to organize Active Directory objects into logical administrative groups. OUs therefore serve as containers in which you can [...]

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Little about Active Directry

January 26, 2011

What is an Active Directory and How Does It Work? An active directory is a service that is provided by Microsoft that stores information about items on a network so the information can be easily made available to specific users through a logon process and network administrators. By using an Active Directory it is possible [...]

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NetBEUI

January 24, 2011

NetBIOS, NetBEUI, and SMB are Microsoft Protocols used to support Microsoft Networking. The NetBIOS stack includes SMB, NetBIOS, and NetBEUI which are described in the table below. The following are parts of the Microsoft networking stack: Name Network Layer Description Redirector Application Directs requests for network resources to the appropriate server and makes network resources [...]

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User Datagram Protocol (UDP)

January 24, 2011

User Datagram Protocol (UDP) supports the network at the transport layer. User Datagram Protocol (UDP) is an unreliable connection-less protocol and is defined by RFC 768 and 1122. It is a datagram service. There is no guarantee that the data will reach its destination. UDP is meant to provide serivce with very little transmission overhead. [...]

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Again Domain Name Service (DNS)

January 24, 2011

Host Names Domain Name Service (DNS) is the service used to convert human readable names of hosts to IP addresses. Host names are not case sensitive and can contain alphabetic or numeric letters or the hyphen. Avoid the underscore. A fully qualified domain name (FQDN) consists of the host name plus domain name as in [...]

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Virtual Private Networking (VPN)

January 24, 2011

The most confusing part of VPN is that many acronyms show up. This is partly because VPN requires data encryption to be “private” and there are many encryption techniques and terms. Also there are many complicated security issues relating to VPN concerning encryption and user authentication. This section will first explain the concept and methodology [...]

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Little About Dynamic Routing

January 24, 2011

Dynamic routing performs the same function as static routing except it is more robust. Static routing allows routing tables in specific routers to be set up in a static manner so network routes for packets are set. If a router on the route goes down the destination may become unreachable. Dynamic routing allows routing tables [...]

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Windows Server 2003 DNS Troubleshooting

January 22, 2011

1) Start Troubleshooting with Ping Can you ping the target machine? a) By IP address. Ping 10.1.0.100 b) By Hostname. Ping BigServer c) By fully qualified domain name. Ping BigServer.guybay.com Examine the replies for clues, for example is the reply BigServer or BigServer.domain.com. Depending on the results from Ping, check the Default Gateway and Subnet [...]

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DNS Resource Records in Windows Server 2003

January 21, 2011

It all started with Host records.  In the beginning there were just flat text files with a list of servers and corresponding IP addresses.  When that got cumbersome and a pain to update, a proper database called DNS (Domain Name System) was invented by Paul Mockapetris in 1983. Since then the DNS types of records [...]

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Little about DNS Zones in Windows Server 2003

January 21, 2011

When you plan a DNS installation, be sure that you choose the most suitable type of zone.  For instance, if your goal is to install a Windows Server 2003 domain, then investigate Active Directory Integrated Zones.  Also decide how many zones to configure, it is easy to focus on the forward lookup zone, but overlook [...]

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How To Disable CDP on Cisco switches

January 21, 2011

Cisco Discover Protocol or CDP is a Cisco-proprietary protocol that runs on all Cisco products. CDP allows devices to learn about neighboring devices (the ones attached directly to the switch) including information about their platform, IP address, the version of IOS or other OS, VLAN membership, etc. This can be helpful information when troubleshooting network [...]

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Communication Devices in Computer Network

January 21, 2011

An electronic device that can send and receive data on the network is called the communication device. The communication devices are used on both ends of the connections. Most of the communication devices have the ability to convert the digital signal of computer into analog signal so that the signals can be transmitted on the [...]

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BRI ISDN Configuration On Cisco Router

January 18, 2011

There are two ways to configure ISDN in a Cisco router. The first one is to setup the ISDN connection to be always on. This method will be very costly because most ISDN service providers charge not only by monthly subscription, but by the amount of data that you transfer. Having the connection opened 24/7, [...]

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How to configure EIGRP on your Cisco router

January 18, 2011

Nots: EIGRP is a Cisco proprietary protocol. So, either all the routers in the Internetwork must be Cisco routers, or the routers should be EIGRP capable. Before starting, if you have not set the bandwidth of the interfaces, set them now. For correct routing decisions, you need to set the bandwidth for the serial interfaces [...]

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Little about GSM

January 18, 2011

GSM was first introduced in the Finland in the year of 1991. GSM mobile phones operate on the TDMA systems. In the TDMA (time division multiple access system), multiple users can access single radio frequency without any interference. GSM is now the de facto standard for the mobile communication in the world. The GSM (Global [...]

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