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What is a frame relay connection?
Frame relay is a protocol that defines how frames are routed through a fast-packet network based on the address field in the frame. Frame relay takes advantage of the reliability of data communications networks to minimize the error checking done by the network nodes.
What is Frame Relay and how does it work?
What does Frame Relay do? Frame Relay sends information in packets called frames through a shared Frame Relay network. Each frame contains all the information necessary to route it to the correct destination. So in effect, each endpoint can communicate with many destinations over one access link to the network.
What are the advantages of Frame Relay?
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- Cost Savings: FR offers reduction of physical local loops over private line network as frame uses a virtual circuit for each new connection.
- Higher circuit utilization: FR makes use of physical circuit by statistically multiplexing multiple PVCs over a single physical circuit.
What is the use of Frame Relay?
Frame relay is often used to connect LANs with major backbones as well as on public wide area networks and also in private network environments with leased T-1 lines. It requires a dedicated connection during the transmission period and is not ideal for voice or video, which require a steady flow of transmissions.
What do you mean by virtual circuit?
A virtual circuit (VC) is a means of transporting data over a packet-switched network in such a way that it appears as though there is a dedicated physical link between the source and destination end systems of this data.
What is replacing Frame Relay?
Thus a VPN can replace a private frame-relay network by using the Internet. The Internet provides connectivity among different offices, and the VPN provides security. Public network solutions are typically half to three-quarters of the cost of private networks, depending on bandwidth requirements.
What are the disadvantages of Frame Relay?
Disadvantages
- 44.736 Mbps data rate is not enough for protocols with higher data rates.
- Allows variable length frames.
- Create varying delays for different users.
- Not suitable for sending delay sensitive data such as real; time voice or video or teleconferencing.
Why are DLCI numbers important in Frame Relay?
DLCIs have local significance only. DLCI numbers are not advertised to other routers, and other routers can use the same DLCI numbers without causing connectivity issues. Cisco uses the term global addressing to describe a technique by which a router in a frame relay network is reached via the same DLCI number from each router in the network.
How is global addressing used in Frame Relay?
Cisco uses the term global addressing to describe a technique by which a router in a frame relay network is reached via the same DLCI number from each router in the network. For example, in a 25-router network, the same DLCI number would be used to reach “Router A” by each router.
How to configure the Frame Relay static mapping?
Configure the Frame Relay static mapping for the specified next hop protocol address and the specified local DLCI. (optional) Enter the broadcast keyword to allow the specified DLCI to forward broadcast and multicast packets.
How does static and dynamic DLCI address mapping work?
Dynamic and static mapping of the next hop protocol address to a specific local DLCI value is explained in this section. Dynamic address mapping relies on the Frame Relay Inverse Address Resolution Protocol (Inverse ARP), defined by RFC 1293, to resolve a next hop network protocol address to a local DLCI value.