Question 1. Protocol Of Frame Relay Rely On For Error Checking?
Frame Relay does not depend on any sure protocol for error checking. Instead, it is based on upper-layer protocols to offer blunders checking. For example, Frame Relay is based on TCP to provide error checking in an IP network.
Question 2. Difference Between Switched Virtual Circuits (svcs) And Permanent Virtual Circuits (percent)?
Switched Virtual Circuits: Switched digital circuits are dynamically hooked up while information desires to be transferred and that are terminated when information transmission is whole.
SVCs consist of four states: call setup, data transfer, idle, and speak to termination.
Permanent Virtual Circuit: Permanent Virtual Circuits are completely installed digital circuits that function in one in all two states: idle or statistics switch. When the PVC is idle, the connection among the DTE devices is still active.
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Question three. At What Layers Of The Osi Model Does Frame Relay Operate?
Frame Relay operates at the 2 decrease layers of the OSI version (facts link and bodily).
Question four. What Is A Data Link Connection Identifier (dlci)?
A DLCI is a number that identifies the logical circuit among the router and the Frame Relay switch. It is the Frame Relay Layer 2 deal with. The Frame Relay transfer maps DLCIs among every pair of routers to create a PVC. For IP gadgets on the give up of every virtual circuit to talk, their IP addresses need to be mapped to DLCIs. If you are going for walks Cisco IOS eleven.2 or later, mapping is performed automatically using Inverse ARP. DLCIs have local importance. Think of DLCIs because the MAC address of the Frame Relay network.
Question five. What Are The Bandwidth Specifications Of Frame Relay?
Committed Information Rate
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Question 6. Explain The Encapsulation Types Of Frame Relay?
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Question 7. What Is The Committed Information Rate (cir)?
The CIR is the committed data charge, by way of the carrier provider, in bits per second, at which statistics could be transferred. The carrier company sends any statistics in extra of this price if its network has capacity at that point.
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Question 8. How Does Frame Relay Use Inverse Arp?
Frame Relay uses Inverse ARP as a manner to dynamically map a community layer address to a DLCI. With Inverse ARP, the router can discover the community address of a tool related to a VC.
Question nine. What Is The Local Management Interface (lmi)?
Local Management Interface (LMI)is a signaling widespread used between your router and the primary Frame Relay transfer it's connected to. It permits for passing data about the operation and standing of the virtual circuit among the company's community and the DTE (your router).
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Question 10. What Is Backward Explicit Congestion Notification (becn) ?
When the switch detects congestion within the Frame Relay community, it will set the Backward Explicit Congestion Notification (BECN)bit in a Frame Relay frame it is destined for the supply router. This notifies the router that congestion is beforehand.
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Question eleven. What Is Forward Explicit Congestion Notification (fecn)?
The FECN is the bit in the Frame Relay header that signals to anybody receiving the frame (switches and DTEs) that congestion is happening inside the identical direction as the body. Switches and DTEs can react by means of slowing the price at which statistics is sent in that path.
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Question 12. In The Frame Relay Header, What Is The Discard Eligibility (de) Bit?
If congestion is detected on the Frame Relay community, the DE bit is grew to become on inside the Frame Relay header. The DE bit is turned on for frames which might be in excess of the CIR. The DE bit tells a transfer which frames to discard in the event that they must be discarded.
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Question thirteen. What Is The Default Lmi Type For Cisco Routers That Are Configured For Frame Relay?
Three kinds of LMIs supported by Cisco routers are: Cisco, ANSI, Q933a.
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Question 14. When A Router Receives Lmi Information, It Updates Its Vc Status To One Of Three States. What Are These Three States?
Routers receive LMI facts from the service provider's Frame Relay turn on a frameencapsulated interface and update the digital circuit popularity to considered one of 3 extraordinary states:
Active state : Everything is up, and routers can exchange statistics.
Inactive kingdom: The router's interface is up and operating with a connection to the switching workplace, but the remote router isn't up.
Deleted country : No LMI facts is being acquired at the interface from the transfer, which might be due to a mapping trouble or a line failure.
Question 15. How Do You Enable Frame Relay On A Cisco Router?
To enable Frame Relay on a Cisco router, you must first permit the serial interface for Frame Relay encapsulation with the encapsulation body-relay interface command:
RouterB(config)#int s zero
RouterB(config-if)#ip address 192.168.1.1 255.255.255.Zero
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