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  5 .1.    What is a DNS server      Domain:- A logical grouping of networked computers in which one or more of the computers has shared resources, such as a shared folder or printer and in which all of the computers share a common Active Directory. Each domain has a unique name.   Domain Name System (DNS) :- Is the name resolution protocol for TCP/IP networks, such as the Internet. Client computers query a DNS server to resolve memorable, alphanumeric DNS names to the IP addresses that computers use to communicate with each other. DNS is a hierarchical caching directory keyed by name, with an extensible set of attributes which are associated with names.   5.2.    Benefits of Active Directory (AD):- Basically, Active Directory improves upon the domain-based architecture of Windows NT to provide a directory service that is better suited to todays distributed networks. AD acts as the central authority for netw...

  4.1.    Network security :-          consists of the provisions made in an underlying computer network infrastructure, policies adopted by the network administrator to protect the network and the network-accessible resources from unauthorized access, and consistent and continuous monitoring and measurement of its effectiveness (or lack) combined together. 4.2.    Comparison with information security The terms network security and information security are often used interchangeably, however network security is generally taken as providing protection at the boundaries of an organization, keeping the intruders (e.g. black hat hackers, script kiddies, etc.) out. Network security systems today are mostly effective, so the focus has shifted to protecting resources from attack or simple mistakes by people inside the organization, e.g. with Data Loss Prevention (DLP). One response to this insider threat in network...

  3.1.   Network Protocols Protocols are needed for computer networks to communicate efficiently. Network protocols are set of rules that enable data to flow from one NIC to another. Protocols control the messages origination, the messages end, and the messages quantity in the network . Major Networking Protocols .   3.1.1.NetBEUI Network Basic Input / Output System. A common network protocol that allows applications on different computers to communicate within a local area network (LAN). It was created by IBM for its early PC Network, and was adopted by Microsoft.   It does not support a routing mechanism. NetBEUI was developed by IBM for its LAN Manager product and has been adopted by Microsoft for its Windows NT, LAN Manager, and Windows for Workgroups products. Advantages High speed on small networks, Ease of implementation, Small memory overhead, Self tuned (does not need configuration) Disadvantages It cannot be routed between networks. ...