ATM : Asynchronous Transfer Model

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ATM (Asynchronous transfer mode) works at data link layer. ATM is a one type of virtual circuit packet switching technology and it’ networks are connection-oriented which is useful to gather information regarding circuit switching. It supports integration of voice, data services, and video on a single network. ADSL is stand for Asymmetric Digital Subscriber Line (ADSL) which is used data related residential service. Which means layer 3 packet is segmented into fixed length 53byte cells, in it 48 bytes of information and 5 bytes of header (overhead) information. So that it allows very fast switches to be built because switches do not have to spend time determining the start and end a variable length frame. Also it ensures that …show more content…

Several virtual paths can also be bundled into a larger logical grouping called a transmission path. ATM allows many customers to share a service provider's network resources and create private VPN's. It is Complicated and expensive to deploy as well as complicated to operate and manage. It is not the fastest WAN option by today's standards, for this reasons this is not used frequently today.

MPLS (multi-protocol label switching) is defined by IETF in 1998. It works between layer 2 and layer 3 protocol so it refers as a 2.5 layer protocol. It works independently at the layer 2 technologies. It can be used over any layer 2 technologies including PPP, frame relay, Ethernet or ATM. It is a label-based switching method; this method allows routers to make forwarding decisions based on the contents of a MPLS label. Service providers can offer MPLS services similar to traditional WAN technologies (frame relay, leased line, ATM services) at lower costs and provide additional IP-based services, which was not available previously.
How MPLS works? MPLS uses label switched path (LSP) to connect each location rather than virtual circuit. MPLS has its own terminology. LSP is similar to a frame relay virtual circuit except that it is independent of a particular layer 2 technology. The big difference is LSP is unidirectional and each LSP must be matched with another in the opposite direction. A router running MPLS protocol called LSR router. The Label edge router (LER) or edge

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