ccna exam module 1

ccna exam module 1.FaO/2 Altn BLK 19 64.4 P2p In the STP of this VLAN1, this port is the alternateReplacement Port Address d0c7.89c2.8380 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 secFa0/l Altn BLK 19 64.3 P2p In the STP of VLAN2, this port is the replacement portThe port is a replacement port in the STP of VLAN2.FaO/2 RootFWD19 64.4P2p In the STP of VLAN2, this port is the root portInterface RoleStsCostPrio.NbrTypeThe output information of , and above indicates that in the STP of VLAN1, the Fa0/l port of switch S3 and Fa0/13 of switch S2 are root ports, and FaO/2 of switch S3 and FaO/14 of switch S2 are blocking ports; in the STP of VLAN2, FaO/2 of switch S3 and Fa0/13 of switch S1 are root ports, and Fa0/l of switch S3 and FaO/14 of switch S2 are blocking ports. Fa0/l of S3 and FaO/14 of switch S1 are blocking ports. Different VLANs block different ports, thus enabling good load sharing of traffic from different VLANs.Q [End-of-Technology Extension 11 In the above experiment, PVST is used to control different VLANs to block different ports to achieve load balancing of the two links between S1 and S2. In fact, bundling Fa0/13 and FaO/14 to form an EtherChannel should be more efficient. EtherChannel will be described in Chapter 15.When explicitly controlling the root bridge in real-world projects, it is recommended to control the root bridge election through priority and not to use the MAC address of the switch to control the root bridge election. If the switch is replaced or new switches are added to the network, the MAC addresses of these switches are not known in advance, which may lead to inconsistent STP election results as expected. Alternatively, you can use the no spanning-tree vlan vlan-id command to disable the STP function for a VLAN. you must ensure that no switching loops exist in that VLAN. It is strongly recommended that you do not perform this operation because the resource usage of STP on the switch is usually tolerable.