What is the primary effect of the spanning-tree portfast command? It enables BPDU messages It minimizes spanning-tree convergence time It immediately puts the port into the forwarding state when the switch is reloaded It immediately enables the port in the listening state.
Refer to the exhibit.
An engineer reconfigures the port-channel between SW1 and SW2 from an access port to a trunk and immediately notices this error in SW1’s log.
%PM-SP-4-ERR_DISABLE: bpduguard error detected on Gi0/0, putting Gi0/0 in err-disable state.
Which command set resolves this error? Sw1(config)# interface G0/0
Sw1(config-if)# no spanning-tree bpduguard enable
Sw1(config-if)# shut
Sw1(config-if)# no shut Sw1(config)# interface G0/0
Sw1(config-if)# spanning-tree bpduguard enable
Sw1(config-if)# shut
Sw1(config-if)# no shut Sw1(config)# interface G0/1
Sw1(config-if)# spanning-tree bpduguard enable
Sw1(config-if)# shut
Sw1(config-if)# no shut Sw1(config)# interface G0/0
Sw1(config-if)# no spanning-tree bpdufilter
Sw1(config-if)# shut
Sw1(config-if)# no shut.
Refer to the exhibit. Link1 is a copper connection and Link2 is a fiber connection. The fiber port must be the primary port for all forwarding. The output of the show spanning-tree command on SW2 shows that the fiber port is blocked by spanning tree. An engineer enters the spanning-tree port-priority 32 command on G0/1 on SW2, but the port remains blocked.spanning_tree_port_priority.jpg
SW2#show spanning-tree
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 24596
Address 0018.7363.4300
Cost 2
Port 13 (GigabitEthernet0/0)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 28692 (priority 28672 sys-id-ext 20)
Address 001b.0d8e.e080
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
---------- ---- ---- ---- -------- ----
Gi0/0 Root FWD 4 128.1 P2p
Gi0/1 Atln BLK 4 32.2 P2p
Which command should be entered on the ports that are connected to Link2 to resolve the issue? Enter spanning-tree port-priority 32 on SW1 Enter spanning-tree port-priority 224 on SW1 Enter spanning-tree port-priority 4 on SW2 Enter spanning-tree port-priority 64 on SW2.
What would be the preferred way to implement a loopless switch network where there are 1500 defined VLANs and it is necessary to load the shared traffic through two main aggregation points based on the VLAN identifier? 802.1D 802.1s 802.1W 802.1AE.
Refer to the exhibit. Which two commands ensure that DSW1 becomes root bridge for VLAN 10 and 20? (Choose two)
show_spanning_tree_mst.jpg spanning-tree mstp 1 priority 0 spanning-tree mst 1 root primary spanning-tree mst vlan 10,20 priority root spanning-tree mst 1 priority 4096 spanning-tree mst 1 priority 1 spanning-tree mstp vlan 10,20 root primary .
Refer to the exhibit. Assuming all links are functional, which path does PC1 take to reach DSW1?
PC1 goes from ALSW1 to DSW1 PC1 goes form ALSW1 to DSW2 to ALSW2 to DSW1 PC1 goes from ALSW1 to DSW2 to Core to DSW1 PC1 goes from ALSW1 to DSW2 to DSW1.
In a traditional 3 tier topology, an engineer must explicitly configure a switch as the root bridge and exclude it from any further election process for the spanning-tree domain. Which action accomplishes this task? Configure the spanning-tree priority to 32768 Configure root guard and portfast on all access switch ports Configure BPDU guard in all switch-to-switch connections Configure the spanning-tree priority equal to 0.
Refer to the exhibit.
show_spanning-tree_vlan_10_bpduguard.jpg
DSW2#
*Mar 3 09:33:23.234: #SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port Fa1/0/7 with BPDU Guard enabled. Disabling port.
*Mar 3 09:33:23.234: %PM-4-ERR_DISABLE: bpduguard error detected on Fa1/0/7, putting Fa1/0/7 in err-disable state
*Mar 3 09:33:23.678: %SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port Fa1/0/7 with BPDU Guard enabled. Disabling port.
*Mar 3 09:33:23.679: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/7, changed state to down
*Mar 3 09:33:23.701: %LINK-3-UPDOWN: Interface FastEthernet1/0/7, changed state to down
An engineer entered the no spanning-tree bpduguard enable on interface fa1/0/7 command. Which statement describes the effect of this command? Fa1/0/7 remains in err-disabled state until the shutdown/no shutdown command is entered in the interface configuration mode Interface Fa1/0/7 remains in err-disabled state until the errdisable recovery cause bpduguard command is entered in the interface configuration mode Fa1/0/7 remains in err-disabled state until the errdisable recovery bpduguard command is entered in the interface configuration mode Interface Fa1/0/7 remains in err-disabled state until the spanning-tree portfast bpduguard disable command is entered in the interface configuration mode Interface Fa1/0/7 returns to an up and operational state.
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