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If it is destined for a station on another lan it is

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same segment where it originated, it is not forwarded. If it is destined for a station on another LAN, it is connected to a different bridge port and forwarded to that port. Routers Routers are more complex and more expensive than bridges. They use information within each packet to route it from one LAN to another, and communicate with each other and share information that allows them to determine the best route through a complex network of many LANs.
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Routers are often used to connect networked users to the internet. Since they let users share things such as modems, ISDN adapters, or ISP accounts they are useful for this function. Routers can be fairly pricey. A less expensive option to shared internet access is a proxy server. Products such as WinProxy let you easily set up internet access for several networked PCs, using a single modem or ISDN line. Switches Switches are another type of device used to link several LANs and route packets between them. A switch has multiple ports, each of which can support either a single station or an entire Ethernet. With a different LAN connected to each of the ports, it can switch packets between LANs as needed. NPA Established 1991, the non-profit Network Professional Association (NPA) is an professional association for computer network professionals. Members adhere to a code-of ethics; demonstrate continual professional development and knowledge, adheres to the latest best practice standards, and strive for continual growth. International awards for professionalism honor individuals for outstanding achievements and meeting the values of professionalism . The NPA offers a Certified Network Professional CNP credential and provides advocacy for workers in the field. Members receive a certificate of membership, quarterly Journal publications, chapters and programs, and opportunities to volunteer and publish. [1] The 7 Layers of the OSI Model Application (Layer 7) This layer supports application and end-user processes. Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. Everything at this layer is application-specific. This layer provides application services for file transfers , e-mail , and other network software services. Telnet and FTP are applications that exist entirely in the application level. Tiered application architectures are part of this layer. Presentation (Layer 6) This layer provides independence from differences in data representation (e.g., encryption ) by translating from application to network format, and vice versa. The presentation layer works to transform data into the form that the application layer can accept. This layer formats and encrypts data to be sent across a network , providing freedom from compatibility problems. It is sometimes called the syntax layer.
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