switch mac address learning spanning tree

#Switch mac address learning spanning tree plus

Answer C is incorrect because the ip default-gateway command does not enable Layer 3 routing in switches. Answer B is incorrect because the default gateway is not related to STP. The default gateway for end devices is still the router of the LAN. SW3’s Gi0/1 will become a designated port.Īnswer A is false because the switch itself is not the Layer 3 gateway for other devices despite the fact that the Layer 2 frames are switched through it. SW3’s Fa0/13 will become a designated port.ĭ.

SW3 will choose Gi0/1 as its root port.Ĭ. SW3 will choose Fa0/13 as its root port.ī. Which of the following is true about STP on SW3?Ī. The Hello received on Fa0/13 lists cost 10, and the Hello received on Gi0/1 lists cost 20. SW3 has no STP-related configuration commands. Switch SW3 is receiving only two Hello BPDUs, both from the same root switch, received on the two interfaces listed as follows: SW3#show interface statusįa0/13 connected 1 a-half a-100 10/100BaseTX The priority of this switch allows it to be capable of being the root switch, but the command output does not supply enough information to know whether this switch is currently root.

#Switch mac address learning spanning tree plus

Cisco switches use the extended system ID format for bridge IDs by default, in which the priority field is broken down into a base priority value (32,768 in this case) plus the VLAN ID. Interface configuration of Media Converters vs.Answer: B.Media Converter Autonegotiation/”Fast Link Pulse” Settings.Power Supply Mode/Role: Master/Slave/Shared.Redundant Management: What is a “Primary” Management Module?.Save Configuration/Reset Management Module.Saving of configuration changes: Cache Dirty/Clean.SMACF100 Management Aggregation Converter.Transmit All Ones / Alarm Indication Signal.xFBRM/xBFFG IEEE802.3ah IP managed Bridging Converters.Spanning Tree protocol has determined that the port may forward packets, or Spanning Tree is disabled (in which case all ports automatically enter forwarding(6) state, even if loops and network disruption are the result. learning(5) Learning MAC addresses for 15 seconds, in preparation for entering forwarding(6) state.Within 15 seconds, the port will switch to either blocking(3) or learning(5) state. listening(4) Listening for BPDU’s (i.e.When link comes up, the port will enter listening(4) state. notSupported(1) The port does not support Spanning Tree.The possible states that a Spanning Tree port can be in are: The STP module transmits and receives BPDU’s (Bridge Protocol Data Units) which permit the module to learn the topology of the network and disable ports if necessary. Spanning Tree Protocol typically runs on switches like the Transition Networks Management Aggregation Converter (SMACF100). STP selectively disables switch ports to keep exactly one path at a time open. Without STP, redundant paths through an Ethernet network form loops which cause packets to be continually recirculated in a “storm” which disrupts the network. Spanning Tree Protocol (STP) allows network configurations that have “backup” paths between stations and/or mitigates the consequences of errors in network planning. Small Form-factor Pluggable (SFP) Transceivers.