| A | B |
|---|
| With the LMI global addressing, the values inserted in the DLCI field of a frame are | globally significant addresses of individual end-user devices (for example, routers). |
| The basic (nonextended) Frame Relay specification supports only values of the DLCI field that identify PVCs with | local significance |
| In basic (nonextended) Frame Relay specification, there are no addresses that identify network interfaces, or nodes attached to these interfaces. Therefore | , they cannot be discovered by traditional address resolution and discovery techniques |
| With normal nonextented Frame Relay addressing, _____ must be created to tell routers which DLCIs to use to find a remote device and its associated internetwork address. | static maps |
| multicast | Single packets copied by the network and sent to a specific subset of network addresses |
| multicast address | Single address that refers to multiple network devices. |
| optional LMI features | address extentions, multicasting |
| Multicast groups are designated by | a series of four reserved DLCI values (1019 to 1022). |
| Frames sent by a device using a multicast reserved DLCI value is replicated by the network and | sent to all exit points in the designated set |
| The multicasting extension also defines LMI messages that notify user devices of the | addition, deletion, and presence of multicast groups |
| Using frames with a multicast DLCI allows messages to be sent to | specific groups of routers. |
| The Inverse ARP mechanism allows the router to | automatically build the Frame Relay map |
| The router learns the DLCIs that are in use from the switch during the | initial LMI exchange. |
| Once the router learns the DLCIs it then sends an Inverse ARP request to | each DLCI for each protocol configured on the interface if the protocol is supported |
| The return information from an Inverse ARP is used to | build the Frame Relay map. |
| Frame relay maps bind next router hop IP addresses to | DLCIs and work together with standard routing tables |
| Frame relay maps can be statically configured, or can be dynamically created by | the invocation of inverse ARP |
| In Frame Relay the router next-hop address determined from the routing table must be resolved to | a Frame Relay DLCI |
| The Frame Relay switching table consists of four entries: | two for incoming port and DLCI, and two for outgoing port and DLCI |
| Step one to implement Frame Relay | Order Frame Relay service from a service provider, or create a private Frame Relay cloud |
| Step two to implement Frame Relay | Connect each router, either directly or through a channel service unit/digital service unit (CSU/DSU), to the Frame Relay switch. |
| Step three to implement Frame Relay | The CPE router is enabled, it sends a Status Inquiry message to the Frame Relay switch |
| When Status Inquiry message is sent to the Frame Relay switch. The message notifies the switch of the router's status, and | asks the switch for the connection status of the other remote routers. |
| Step four to implement Frame Relay | The FR switch responds with a Status message that includes the DLCIs of the remote routers to which the local router can send data. |
| Step five to implement Frame Relay | For each active DLCI, each router sends an Inverse ARP request packet, introducing itself and asking for each remote router to identify itself |
| Step six to implement Frame Relay | For every DLCI that the router learns about through an Inverse ARP message, a map entry is created in the router's Frame Relay map table |
| FR map table Active state-Indicates that the connection is active and | that routers can exchange data |
| FR map table Inactive state-Indicates that the local connection to Frame Relay switch is working, but | the remote router's connection to Frame Relay switch is not working. |
| FR map table Deleted state-Indicates that | no LMI is being received from the Frame Relay switch or no service between the CPE router and Frame Relay switch is occurring. |
| By default, every ___ the CPE router sends a keepalive message to the Frame Relay switch | 10 seconds |
| Every _____ , the routers exchange Inverse ARP messages | 60 seconds |
