1. Which two criteria does a switch use to select the root
bridge? (Choose two.)
bridge priority
base MAC address
2. Which two statements are true about the default operation
of STP in a Layer 2 switched environment that has redundant connections between
switches? (Choose two.)
Decisions on which port to block when two ports have equal
cost depend on the port priority and identity.
Non-root switches each have only one root port.
3. Refer to the exhibit. All switches in the network have
empty MAC tables. STP has been disabled on the switches in the network. How
will a broadcast frame that is sent by host PC1 be handled on the network?
Switch SW1 will forward the broadcast out all switch ports,
except the originating port. This will generate an endless loop in the network.
4. Which two statements describe the BIDs used in a spanning
tree topology? (Choose two.)
They consist of a bridge priority and MAC address.
They are used by the switches in a spanning tree topology to
elect the root bridge.
5. Which statement or set of paired statements correctly
compares STP with RSTP?
STP waits for the network to converge before placing ports
into forwarding state. RSTP places designated ports into forwarding state
immediately.
6. How can a network administrator influence which STP
switch becomes the root bridge?
Set the switch priority to a smaller value than that of the
other switches in the network.
7. In which STP state does a port record MAC addresses but
not forward user data?
learning
8. When PVST+ was developed, the Bridge ID was modified to
include which information?
VLAN ID
9. What is the first step in the process of convergence in a
spanning tree topology?
election of the root bridge
10. What two elements will exist in a converged network with
one spanning tree? (Choose two.)
one root bridge per network
one root port per non-root bridge
11. Refer to the exhibit. What can be determined from the
output shown?
The priority was statically configured to identify the root.
12. What two features of the Spanning-Tree Protocol
contribute to the time it takes for a switched network to converge after a
topology change occurs? (Choose two.)
the max-age timer
the forward delay
13. What three link types have been defined for Rapid
Spanning-Tree Protocol? (Choose three.)
shared
edge-type
point-to-point
14. Refer to the exhibit. The spanning-tree port priority of
each interface is at the default setting. The network administrator enters the
spanning-tree vlan 1 root primary command on S4. What is the effect of the
command?
Gi0/2 on S3 transitions to a root port.
15. In which two ways is the information that is contained
in BPDUs used by switches? (Choose two.)
to identify the shortest path to the root bridge
to determine which ports will forward frames as part of the
spanning tree
16. What Rapid Spanning Tree Protocol (RSTP) role is
assigned to the forwarding port elected for every Ethernet LAN segment that
links two switches?
designated
17. Which two items are true regarding the spanning-tree
portfast command? (Choose two.)
PortFast is Cisco proprietary.
If an access port is configured with PortFast, it
immediately transitions from a blocking to a forwarding state.
18. Which two actions does an RSTP edge port take if it receives
a BPDU? (Choose two.)
immediately loses its edge status
becomes a normal spanning-tree port
19. Refer to the exhibit. Server sends an ARP request for
the MAC address of its default gateway. If STP is not enabled, what will be the
result of this ARP request?
Switch_A and Switch_B will continuously flood the message
onto the network.
20. Which three statements are accurate regarding RSTP and
STP? (Choose three.)
Both RSTP and STP use the portfast command to allow ports to
immediately transition to forwarding state.
Configuration commands to establish primary and secondary
root bridges are identical for STP and RSTP.
Because of the format of the BPDU packet, RSTP is backward
compatible with STP.
CCNA 3 Chapter 5 Answers |
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