Module 5: STP Concepts

Which two statements describe a switch port that is configured with PortFast? (Choose two) a. The switch port should never receive BPDUs b. The switch port sends DHCP requests before transitioning to the forwarding state c. The switch port immediately processes any BPDUs before transitioning to the forwarding state d. The switch port immediately transitions from the listening to the forwarding state e. The switch port immediately transitions from blocking to the forwarding state

a. The switch port should never receive BPDUs e. The switch port immediately transitions from blocking to the forwarding state

Which STP part role is adopted by a switch port is there is no other port with a lower cost to the root bridge? a. root port b. disable port c. designated port d. alternate

a. root port

What is an accurate description of redundancy? a. configuring a router with a complete MAC address database to ensure that all frames can be forwarded to the correct destination b. designing a network to use multiple paths between switches to ensure there is no single point of failure c. designing a network to use multiple virtual devices to ensure that all traffic uses the best path through the internetwork d. configuring a switch with proper security to ensure that all traffic forwarded through an interface is filtered

b. designing a network to use multiple paths between switches to ensure there is no single point of failure

Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two) a. extended system ID b. edge port c. PVST+ d. PortFast e. bridge ID

b. edge port d. PortFast

When PVST is running over a switched network, which port state can participate in BPDU frame forwarding based on BPDUs received, but does not forward data frames? a. forwarding b. listening c. blocking d. disabled

b. listening

An admin is troubleshooting a switch and wants to verify if it is a root bridge. What command can be used to do this? a. show vlan b. show spanning-tree c. show startup-config d. show running-config

b. show spanning-tree

After the election of the root bridge has been completed, how will switches find the best paths to the root bridge? a. Each switch will analyze the port states of all neighbors and use the designated ports to forward traffic to the root b. Each switch will analyze the BID of all neighbors to reach the root and use the path through the lowest BID neighbors c. Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost d. Each switch will analyze the sum of the hops to reach the root and use the path with the fewest hops

c. Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost

Which three port states are used by Rapid PVST+? a. blocking b. trunking c. discarding d. listening e. learning f. forwarding

c. discarding e. learning f. forwarding

Which port state will switch ports immediately transition to when configured for PortFast? a. learning b. listening c. forwarding d. blocking

c. forwarding

What value determines the root bridge when all switches connected by trunk links have default STP configurations? a. VLAN ID b. extended system ID c. bridge priority d. MAC address

d. MAC address

Which is the default STP operation mode on Cisco Catalyst switches? a. MST b. MSTP c. Rapid PVST+ d. PVST+ e. RSTP

d. PVST+

What additional information is contained in the 12-bit extended system ID of a BPDU? a. IP address b. MAC address c. port ID d. VLAN ID

d. VLAN ID

During the implementation of Spanning Tree Protocol, all switches are rebooted by the network admin. What is the first step of the spanning-tree election process? a. All the switches send out BPDUs advertising themselves as the root bridge b. Each switch determines the best path to forward traffic c. Each switch with a lower root ID than its neighbor will not send BPDUs d. Each switch determines what port to block to prevent a loop from occurring

a. All the switches send out BPDUs advertising themselves as the root bridge

What is one way to correct a spanning tree failure? a. Manually remove redundant links in the switched network b. Insert redundant links to replace the failed STP links c. Replace the cables on failed STP link d. Replace all instances of STP with RSTP

a. Manually remove redundant links in the switched network