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When a Token-Ring network is initialized, one node on the ring is elected the Active Monitor This node is responsible for monitoring the passage of the token around the ring, deleting duplicate tokens if they occur, and generally making sure that everything runs smoothly The process of electing an Active Monitor is transparent to network users and to network administrators The show interface tokenring command will display the ring status as "initializing" if the router has just been connected to the ring This is because the router interface will need to be added into the sequence of computers to receive the token This process is referred to as the router interface "being inserted into the ring" If a hardware error has occurred, the show interface tokenring command will report an interface status of Reset The most common problems reported on token rings are incompatible ring speeds, ring beaconing conditions, source routing not enabled, or a large number of transitions Ring speeds can be set either to 4 Mbps or to 16 Mbps with the commands shown as follows Router1(config)#interface tokenring 0 Router1(config-int)#ring-speed 4 The default is 16 Mbps, and if the interface is changed to 4 Mbps with the command above, the interface speed can be changed back again with the ring-speed 16 configuration command The current ring speed setting is given in the screen display of the show interface tokenring command Ring beaconing occurs when a serious problem with a network component, such as the cabling, Multistation Access Unit (MSAU), or a node interface is detected As a token gets passed around a ring, each node receives the token from its Nearest ActiveUpstream Neighbor (NAUN) Should a node not receive a valid token from its NAUN, the node will report a beacon condition to all other stations on the network In theory, this should initiate an auto-reconfiguration process, whereby the suspect NAUN and node reporting the beacon are taken out of the ring and normal operation is restored for the rest of the ring I have rarely seen this work in practice If a serious problem exists and a node sends out beacon frames, the problem generally has to be fixed by manual intervention before the ring is operational again Source routing was discussed in detail in Chap 5 The show interface tokenring command display tells you whether the interface is configured for source routing The display will either indicate the interface is a single ring node or multi-ringnode Multi-ring nodes are enabled to collect and utilize RIF field information and therefore can participate in source routing This line also tells you the type of bridging for which the interface is enabled The interface whose show interfacetokenring command is displayed in Fig 8-11 is enabled only for transparent bridging and not for source route bridging For the commands needed to enable source route bridging on an interface, refer to the section on Chap 5 on source route bridging If transitions are reported on an interface, it indicates that the ring made a transition from an up to d t t i A ti ll i i t ft iti th t ith th i.

17 D A cold site provides only the disaster recovery facility The equipment and data are the responsibility of the company using the facility A, B, and C are incorrect A hot site provides the facility and the equipment, and it will ensure that an up-to-date copy of an organization s data is available in case of disaster A warm site provides the facility and the backup equipment to perform a restore when needed There s no such thing as a blue site 18 A A hot site provides the facility and the equipment, and it will ensure that an up-to-date copy of an organization s data is available in case of disaster B, C, and D are incorrect A cold site provides only the disaster recovery facility The equipment and data are the responsibility of the company using the facility A warm site provides the facility and the backup equipment to perform a restore when needed There s no such thing as a blue site 19 D A hot spare is connected and already has power supplied to it so that there is minimal delay for failover A, B, and C are incorrect A cold spare is not connected and immediately available When needed, it must be connected and powered up to become available The other choices are not types of spares

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