STP 3 Flashcards
Question 1 When you enable PortFast on a switch port, the port immediately transitions to which state? A. Blocking B. Forwarding C. Learning D. Listening
Answer: B
Question 2 What can you change to select switch as root bridge? A. make lower priority B. make higher priority C. make lower path cost D. make higher path cost
Answer: A
Question 3 Which type of port role does not participate in STP calculation? A. Listening B. Learning C. Forwarding D. Discarding
Answer: D
Question 4
Which statement about spanning-tree root-bridge election is true?
A. It is always performed automatically
B. Each VLAN must have its own root bridge
C. Each VLAN must use the same root bridge
D. Each root bridge must reside on the same root switch
Answer: B
Question 5
A question about BPDU. What would a PortFast BPDU guard port do when it is configured on a port? (Choose two)
A. err-disabled when port receives BPDUs
B. supported only on nontrunking access ports
C. forward when port receives BPDUs
D. supported on trunk ports
Answer: A B
Question 6
What is one benefit of PVST+?
A. PVST+reduces the CPU cycles for all the switches in the network
B. PVST+automatically selects the root bridge location,to provide optimized bandwidth usage.
C. PVST+allow the root switch location to be optimized per vlan.
D. PVST+supports Layer 3 load balancing without loops.
Answer: C
Question 7 For which two protocols can PortFast alleviate potential host startup issues? (Choose two) A. DHCP B. DNS C. OSPF D. RIP E. CDP
Answer: A B
Question 8
Refer to the exhibit. Which statement is true?
A. The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20.
B. VLAN 20 is running the Per VLAN Spanning Tree Protocol.
C. The MAC address of the root bridge is 0017.596d.1580. D. SwitchA is not the root bridge, because not all of the interface roles are designated.
Answer: D
