FreeBSD is a Unix-like free operating system descended from AT&T UNIX via the Berkeley Software Distribution (BSD) branch through the 386BSD and 4.4BSD operating systems. It runs on Intel x86 family (IA-32) PC compatible computers, DEC Alpha, Sun UltraSPARC, IA-64, AMD64, PowerPC, ARM and NEC PC-98 architectures along with the Microsoft Xbox.
Support for the MIPS architectures is under development.
FreeBSD has been characterized as "the unknown giant among free operating systems." It is not a clone of UNIX, but works like UNIX, with UNIX-compliant internals and system APIs. FreeBSD is generally regarded as reliable and robust. Among all operating systems which can accurately report uptime remotely, FreeBSD is the free operating system listed most often in Netcraft's list of the 50 web servers with the longest uptime. A long uptime also indicates no crashes have occurred and no kernel updates have been deemed needed, since installing a new kernel requires a reboot and resets the uptime counter of the system.
FreeBSD is developed as a complete operating system. The kernel, device drivers and all of the userland utilities, such as the shell, are held in the same source code revision tracking tree (CVS). Whereas with Linux the kernel, userland utilities and applications are developed separately, then packaged together in various ways by other groups as Linux distributions.

Windows Server 2008 is the the most recent release of Microsoft Windows's server line of operating system. Released on February 4, 2008, it is the successor to Windows Server 2003, released nearly five years earlier. Like Windows Vista, Windows Server 2008 is built on the Windows NT 6.0 kernel.It was known as Windows Server Codename "Longhorn" until May 16, 2007, when Microsoft chairman Bill Gates announced its official title (Windows Server 2008) during his keynote address at WinHEC.Beta 1 was released on July 27, 2005, Beta 2 was announced and released on May 23, 2006 at WinHEC 2006 and Beta 3 was released publicly on April 25, 2007. Release Candidate 0 was released to the general public on September 24, 2007 and Release Candidate 1 was released to the general public on December 5, 2007. Windows Server 2008 was released to manufacturing on February 4, 2008 with the official launch of planned for February 27, 2008.

While the term wireless network may technically be used to refer to any type of network that is wireless, the term is most commonly used to refer to a telecommunications network whose interconnections between nodes is implemented without the use of wires, such as a computer network (which is a type of communications network). Wireless telecommunications networks are generally implemented with some type of remote information transmission system that uses electromagnetic waves, such as radio waves, for the carrier and this implementation usually takes place at the physical level or "layer" of the network. (For example, see the Physical Layer of the OSI Model).

Type Of Servers:
Server (computing) a server application, operating system, computer, or appliance.
Application server a server dedicated to running certain software applications
Communications server, carrier-grade computing platform for communications networks.
Database server provides database services.
Proxy server Provides database IT server in services.
Fax server provides fax services for clients.
File server provides file services.
Game server a server that video game clients connect to in order to play online together
Standalone server an emulator for client-server (web-based) programs.
Web server a server that HTTP clients connect to in order to send commands and receive responses along with data contents.
Client-server a software architecture that separates "server" functions from "client" functions.
The X Server part of the X Window System.
Peer-to-peer a network of computers running as both clients and servers.
Catalog server a central search point for information across a distributed network.

Network management refers to the activities, methods, procedures, and tools that pertain to the operation, administration, maintenance, and provisioning of networked systems.
Operation deals with keeping the network (and the services that the network provides) up and running smoothly. It includes monitoring the network to spot problems as soon as possible, ideally before users are affected.
Administration deals with keeping track of resources in the network and how they are assigned. It includes all the "housekeeping" that is necessary to keep the network under control.
Maintenance is concerned with performing repairs and upgrades - for example, when equipment must be replaced, when a router needs a patch for an operating system image, when a new switch is added to a network. Maintenance also involves corrective and preventive measures to make the managed network run "better", such as adjusting device configuration parameters.
Provisioning is concerned with configuring resources in the network to support a given service. For example, this might include setting up the network so that a new customer can receive voice service.
Functions that are performed as part of network management accordingly include controlling, planning, allocating, deploying, coordinating, and monitoring the resources of a network, network planning, frequency allocation, predetermined traffic routing to support load balancing, cryptographic key distribution authorization, configuration management, fault management, security management, performance management, bandwidth management, and accounting management.
Data for network management is collected through several mechanisms, including agents installed on infrastructure, synthetic monitoring that simulates transactions, logs of activity, sniffers and real user monitoring. In the past network management mainly consisted of monitoring whether devices were up or down; today performance management has become a crucial part of the IT team's role which brings about a host of challenges -- especially for global organizations.

Computer security is a branch of information security applied to both theoretical and actual computer systems. Computer security is a branch of computer science that addresses enforcement of 'secure' behavior on the operation of computers. The definition of 'secure' varies by application, and is typically defined implicitly or explicitly by a security policy that addresses confidentiality, integrity and availability of electronic information that is processed by or stored on computer systems.
The traditional approach is to create a trusted security kernel that exploits special-purpose hardware mechanisms in the microprocessor to constrain the operating system and the application programs to conform to the security policy. These systems can isolate processes and data to specifier domains and restrict access and privileges of users. This approach avoids trusting most of the operating system and applications.
In addition to restricting actions to a secure subset, a secure system should still permit authorized users to carry out legitimate and useful tasks. It might be possible to secure a computer against misuse using extreme measures:

It is important to distinguish the techniques used to increase a system's security from the issue of that system's security status. In particular, systems which contain fundamental flaws in their security designs cannot be made secure without compromising their usability.Most computer systems cannot be made secure even after the application of extensive "computer security" measures. Furthermore, if they are made secure, functionality and ease of use often decreases.
Computer security can also be seen as a subfield of security engineering, which looks at broader security issues in addition to computer security.

A firewall's basic task is to regulate some of the flow of traffic between computer networks of different trust levels. Typical examples are the Internet which is a zone with no trust and an internal network which is a zone of higher trust. A zone with an intermediate trust level, situated between the Internet and a trusted internal network, is often referred to as a "perimeter network" or Demilitarized zone (DMZ).
A firewall's function within a network is similar to firewalls with fire doors in building construction. In the former case, it is used to prevent network intrusion to the private network. In the latter case, it is intended to contain and delay structural fire from spreading to adjacent structures.
Without proper configuration, a firewall can often become worthless. Standard security practices dictate a "default-deny" firewall ruleset, in which the only network connections which are allowed are the ones that have been explicitly allowed. Unfortunately, such a configuration requires detailed understanding of the network applications and endpoints required for the organization's day-to-day operation. Many businesses lack such understanding, and therefore implement a "default-allow" ruleset, in which all traffic is allowed unless it has been specifically blocked. This configuration makes inadvertent network connections and system compromise much more likely.