WorksheetsCCNP ENCOR - STP - cap. 2, 3 e 4
Total questions: 22
Worksheet time: 12mins
How many different BPDU types are there?
1
2
3
4
What attributes are used to elect a root bridge?
Switch port priority
Bridge priority
Switch serial number
Path cost
The original 802.1D specification assigns what value to a 1 Gbps interface?
1
2
4
19
All of the ports on a root bridge are assigned what role?
Root port
Designated port
Superior port
Master port
Using default settings, how long (in sec) does a port stay in the listening state?
2
5
10
15
Upon receipt of a configuration BPDU with the topology change flag set, how do the downstream switches react?
By moving all ports to a blocking state on all switches
By flushing out all MAC addresses from the MAC address table
By temporarily moving all non-root ports to a listening state
By flushing out all old MAC addresses from the MAC address table
By updating the Topology Change version fl ag on the local switch database
Which of the following is NOT an RSTP port state?
Blocking
Listening
Learning
Forwarding
True or false: In a large Layer 2 switch topology, the infrastructure must fully converge before any packets can be forwarded.
True
False
True or false: In a large Layer 2 switch topology that is running RSTP, the
infrastructure must fully converge before any packets can be forwarded.
TRUE
FALSE
A switch’s STP priority can be configured in increments of ______.
1
256
2048
4096
True or false: The advertised path cost includes the advertising link’s port cost as part of the configuration BPDU advertisement.
TRUE
FALSE
True or false: The switch port with the lower STP port priority is more preferred.
TRUE
FALSE
What happens to a switch port when a BPDU is received on it when BPDU guard is
enabled on that port?
A message syslog is generated, and the BPDU is filtered.
A syslog message is not generated, and the BPDU is filtered.
A syslog message is generated, and the port is sent back to a listening state.
A syslog message is generated, and the port is shut down.
Enabling root guard on a switch port does what?
Upon receipt of an inferior BPDU, the port is shut down.
Upon receipt of a superior BPDU, the port is shut down.
Upon receipt of an inferior BPDU, the BPDU is filtered.
When the root port is shut down, only authorized designated ports can become
root ports.
UDLD solves the problem of ______.
time for Layer 2 convergence
a cable sending traffic in only one direction
corrupt BPDU packets
fl apping network links
Which of the following issues does MST solve? (Choose two.)
Enables traffic load balancing for specific VLANs
Reduces the CPU and memory resources needed for environments with large
numbers of VLANs
Overcomes MAC address table scaling limitations for environments with large
numbers of devices
Detects issues with cabling that transmits data in one direction
Prevents unauthorized switches from attaching to the Layer 2 domain
With MST, VLANs are directly associated with ______.
areas
regions
instances
switches
What do CST and 802.1D have in common?
They support only one topology.
They support multiple topologies.
They allow for load balancing of traffic across different VLANs.
They provide switch authentication so that inter-switch connectivity can occur.
True or false: The MST root bridge advertises the VLAN-to-instance mappings to all
other MST switches.
TRUE
FALSE
True or false: The MST configuration version is locally significant.
TRUE
FALSE
True or false: The MST topology can be tuned for root bridge placement, just like
PVST+ and RSTP.
TRUE
FALSE
MST regions can interact with PVST+/RSTP in which of the following ways?
(Choose two.)
The MST region is the root bridge for all VLANs.
The MST region is the root bridge for some VLANs.
The PVST+/RSTP topology is the root bridge for all VLANs.
The PVST+/RSTP topology is the root bridge for some VLANs.
