Ccie exam dumps)Introduction to Frame Relay Technology

(Ccie exam dumps)Introduction to Frame Relay Technology

In the 1980s, many users used LAN (local area network) technology locally. A company, enterprise, or organization connects multiple personal computers of the unit with LAN, shares local network resources, and accesses the public telecommunication network through a bridge or router. The data characteristics of such users are large data volume and high burstiness. In addition to LAN, computer-aided design (CAD), computer-aided manufacturing (CAM), and image transfer services are also bursty because their file data is often large, For example, a normal X-ray film will have 8 megabytes of data.(Ccie exam dumps)



The packet network is used to open services for these users. Because the amount of data to be transmitted by the user is large, and the access rate of the packet network is low and the transmission is prolonged, the user has to wait for a long time to send and receive information, which may make the user unsatisfied.If you use digital data networks(DDN) and digital data lines to open up services for these users, although the communication efficiency is improved, but the cost is relatively high. New communication needs from users have prompted people to consider adopting new communication technologies.(Ccie exam dumps)

At the same time, network technology has changed a lot. The intelligence of user equipment is generally improved. The optical fibers have been commonly used in trunk transmission lines, and the optical fiber transmission performance is high and the bit error rate is low. In this case, the error correction and flow control problems can be solved by higher layer protocols on the user equipment, and the network protocol can be simplified. Thus, the packet switching protocol has been simplified, resulting in Frame Relay (FR) technology.(Ccie exam dumps)

Frame relay is a new public data network communication protocol that emerged in 1992. It began to develop rapidly in 1994. Frame Relay is an efficient data transmission technology that can transmit digital information quickly and inexpensively in one-to-one or one-to-many applications. It can be used for voice and data communication, and can be used for both local area network (LAN) and wide area network (WAN) communication. Each Frame Relay user will get a dedicated line to the Frame Relay node. The Frame Relay network handles data transmission with other users through a channel that changes frequently and is invisible to the user.(Ccie exam dumps)

It is a simplified X.25 WAN protocol. The Frame Relay protocol is a statistical multiplexing protocol that provides multiple virtual circuits on a single physical transmission line. Each virtual circuit is identified by a Data Link Connection Identifier (DLCI). The DLCI is valid only on the local interface and the peer interface directly connected to it. It does not have global validity, that is, in the frame relay network. The same DLCI on different physical interfaces does not mean that it is the same virtual circuit. A frame relay network can be either a public network or a private network of an enterprise, can also be a network formed by direct connections between data devices.(Ccie exam dumps)

Same as X. Compared with the 25 packet switching technology, it has the following characteristics:

(1) Frame Relay inherits the characteristics of X.25 packet switching statistical multiplexing. By multiplexing multiple virtual circuits on one physical circuit, the data bandwidth resources are dynamically allocated among users, which improves the line utilization.

(2) Frame Relay greatly simplifies the X.25 communication protocol. The network only detects errors and does not correct errors in information processing. It discards the error frame once it is found. It also delivers end-to-end flow control to the user terminal, reducing the processing load on the network switch and reducing the end-to-end transmission delay of user information.

(3) Frame Relay provides users with a preferential charging policy, that is, charging according to the committed information rate (CIR) and guaranteeing the transmission of information below CIR; meanwhile, allowing users to transmit data higher than CIR. Information, this part of the information transmission is not charged, the network will be transmitted when idle, and will be discarded when congestion occurs.

(4) Frame relay has a long frame length (up to 4096 bytes) and is more efficient when transmitting long-range LAN data information frames (about 1500 bytes), which is suitable for LAN interconnection.



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(Ccie exam dumps)Introduction to Frame Relay Technology