All part of, computer networks let us share information and resources. In this chapter, you'll begin by relating networks to situations and concepts.
विशेषताये:-. यह एक कमरे या एक बिल्डिंग तक सीमित रहता है. इसकी डाटा हस्तांतरित (Data Transfer) Speed अधिक होती है.
इसमें बाहरी नेटवर्क को किराये पर नहीं लेना पड़ता है. इसमें डाटा सुरक्षित रहता है. इसमें डाटा को व्यवस्थित करना आसान होता है MAN (Metropolitan Area Network):- इसका पूरा नाम Metropolitan Area Network हैं यह एक ऐसा उच्च गति वाला नेटवर्क है जो आवाज, डाटा और इमेज को 200 मेगाबाइट प्रति सेकंड या इससे अधिक गति से डाटा को 75 कि.मी.
की दूरी तक ले जा सकता है यह लेन (LAN) से बड़ा तथा वेन (WAN) से छोटा नेटवर्क होता है इस नेटवर्क के द्वारा एक शहर को दूसरे शहर से जोड़ा जाता है इसके अंतर्गत दो या दो से अधिक लोकल एरिया नेटवर्क एक साथ जुड़े होते हैं. यह एक शहर के सीमाओ के भीतर का स्थित कंप्यूटर नेटवर्क होता हैं. राउटर, स्विच और हब्स मिलकर एक मेट्रोपोलिटन एरिया नेटवर्क का निर्माण करता हैं विशेषताये:-. इसका रखरखाव कठिन होता है. इसकी गति उच्च होती है.
यह 75 कि.मी. की दूरी तक फैला रहता है WAN (Wide area Network):- इसका पूरा नाम Wide Area Network होता है यह क्षेत्रफल की द्रष्टि से बड़ा नेटवर्क होता है यह नेटवर्क न केवल एक बिल्डिंग, न केवल एक शहर तक सीमित रहता है बल्कि यह पूरे विश्व को जोड़ने का कार्य करता है अर्थात् यह सबसे बड़ा नेटवर्क होता है इसमें डाटा को सुरक्षित भेजा और प्राप्त किया जाता है इस नेटवर्क मे कंप्यूटर आपस मे लीज्ड लाइन या स्विच सर्किट के दुवारा जुड़े रहते हैं. इस नेटवर्क की भौगोलिक परिधि बड़ी होती है जैसे पूरा शहर, देश या महादेश मे फैला नेटवर्क का जाल. इसका एक अच्छा उदाहरण हैं.
बैंको का ATM सुविधा वाईड एरिया नेटवर्क का उदाहरण हैं.
Full mesh topology or fully connected network, complete topology is a network topology in which there is a direct link between all pairs of nodes. There is usually n(n-1)/2 direct links in a fully connected network with n nodes. This kind of topology is mostly seen in military applications and is simple to be created with help of ConceptDraw PRO software as our Computer and Networks solution from Computer and Networks area of ConceptDraw Solution Park provides examples, templates and vector stencils library with symbols of local area network (LAN) and wireless LAN (WLAN) equipment. In order to draw the physical and logical network topology diagrams for wired and wireless computer communication networks we recommend to download and start using this incredible application already now as it will allow you to make any kind of diagram as well as any kind of chart, flowchart, scheme and plan. A two-node network is technically a fully connected network and to describe it is better in a way of diagram and to draw such diagram is better using our product having all necessary tools for making the final result look truly professional. Having no experience and knowledge in making similar diagrams as well as having many years of practice of creating them – no matter how good you are at making such schemes, you can always rely upon the unique application that can be useful in drawing whatever in only a couple of minutes as any pre-made examples and templates are there for your use, available for all of our clients. Computer Network can be described as a telecommunication network that allows the networked computing devices to exchange the data using the network links.
The most known computer network is the Internet, very well know worldwide. The network links or connections between the nodes are being set up using the cable media or wireless media. The nodes are the network computer devices: computers, phones, servers, etc. There are many different types of the computer networks, such as Personal area network (PAN), Local area network (LAN), Metropolitan area network (MAN), Campus area network (CAN), Storage area network (SAN), Global Area Network (GAN) and Wide area network (WAN). ConceptDraw PRO is a powerful computer network diagramming and vector drawing software which can be used for making any of mentioned above network diagrams and more. It provides the Computer and Networks Area for quick, simple and effective drawing the different types of computer network diagrams.
Our solutions of the Computer and Networks Area contain many professional looking examples that you can customize for your needs to draw your own computer networks in a few minutes. You can always also use the great number of ready-to-use predesigned vector objects from the libraries of the Computer and Networks Area as well as any needed examples of already designed computer network diagrams and other diagrams and charts. All of them were created in ConceptDraw PRO using the Computer and Networks Area of ConceptDraw Solution Park and you are free to use all of them any time you want and need.
Creating network diagram in order to describe the existing network structure can be hard. Even very difficult in case you don’t know where to start from and what to do. But with the help of our templates of different schemes and diagrams, including the network ones, you will find the process of creating sun, simple and entertaining. Created network diagram can present you the existing information in comprehensible graphic view but to make it happen and to actually create it you might need different symbols, the design ones, so you can use them for adding in your diagram.
Our Computer Network Diagrams Solution is available for all of our clients, ConceptDraw PRO users, offering lots of stencil libraries with design elements for those who do not want to make their own symbols. Why to be bothered? Our team of professional designers has already prepared lots of network diagrams samples for your use. Find our Physical Network Diagrams and Logical Network Diagrams that present the information about logical network structure, including Domain architecture, Used protocols, Servers roles and Trust relationship.
Physical Network Diagram itself presents Telecommunications data, such as cable length, carrying capacity or telecommunication type; Servers with names, IP address (if it is static), server role and domain name; Location of network equipment such as hubs, switches, modems, routers, bridges and printers as well as Number of network users. Make it in only a few minutes with help of our solution that includes all necessary tools for network administrators and engineers to develop the new networks and manage the existing networks. Having all necessary design symbols from the vector stencil image libraries with full standardized Chen and Crow’s foot notations as well as knowing all the meaning of all of these stencils means having everything for making entity-relationship diagram in case you have ConceptDraw PRO to draw it there in a short period of time. Having the Entity-Relationship Diagram (ERD) solution that contains a number of ERD templates and samples added to the solution pack which can be used for making any needed diagram in terms of the final result looking really professional and smart is a great thing to get in case it is as cheap as we sell this application for. Mentioning the entities, the attributes and the relationships between these entities means creating ERD or entity relationship diagram.
An entity that cannot be uniquely identified by its attributes alone is a weak entity. The existence of a weak entity is dependent upon another entity called the owner entity. The weak entity’s identifier is a combination of the identifier of the owner entity and the partial key of the weak entity. An entity used in a many-to-many relationship (represents an extra table) is an associative entity. The attributes can be key ones, multivalued and derived. In the Chen notation each attribute is represented by an oval containing attribute’s name. The key attribute is an attribute that uniquely identifies a particular entity.
A multivalued attribute is an attribute that can have many values (there are many distinct values entered for it in the same column of the table). The derived attribute is the one whose value is calculated (derived) from other attributes. Mentioning all of them in your ERD means making truly professional and smart diagram.