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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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Special Purpose Network Addresses Every System admin need to know

January 25, 2011

Different types of Classes of Network Class A Addresses Class A address must be between 0 and 127 network.node.node.node Class B Addresses Class B address must be between 128 and 191 network.network.node.node Class C Addresses Class C address must be between 192 and 223 network.network.network.node Network Addresses: Special Purpose Some IP addresses are reserved for special purposes, [...]

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How to configure Cisco SPAN Ports

January 25, 2011

The following example will demonstrate how to configure a single SPAN session on a Cisco Catalyst switch. The specifics are different between different switch models, so be sure to check the Cisco documentation. You must first configure source ports. Source ports are ports whose data will be copied, and sent to the destination, or SPAN [...]

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Address Resolution Protocol

January 24, 2011

ARP and RARP Address Translation Address Resolution Protocol (ARP) provides a completely different function to the network than Reverse Address Resolution Protocol (RARP). ARP is used to resolve the ethernet address of a NIC from an IP address in order to construct an ethernet packet around an IP data packet. This must happen in order [...]

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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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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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DNS Names in Windows Server 2003

January 21, 2011

Introduction to DNS Names The purpose of DNS is to provide a connection when we type a name.  Now that name could refer to a server, a host, a web site, or a UNC path.  Always remember that computers prefer to use an IP address and that the role of DNS is a database of [...]

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Access list types

January 21, 2011

There are three basic types of IP access lists: standard, extended, and dynamic extended. Standard access lists use source addressing for applying rules and provide very basic forms of filtering. Extended access lists use both source and destination addresses for filtering and even allow filtering by protocol type. This allows a more granular method of [...]

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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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NAT and PAT Configuration on Cisco Router

January 18, 2011

There are two types of NAT that can be configured on a Cisco router; static, and dynamic. Static NAT Configuration: This type is used when you want to do one-to-one assignment of local IP addresses to global IP addresses. 1. Establish static translation between an inside local address and an inside global address, Router(config)#ip nat [...]

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