Spanning Tree Protocol Flashcards
How Many different BPDU types are there?
A) One
B) Two
C) Three
D) Four
Two
What attributes are used to elect a root bridge?
A) Switch port priority
B) Bridge Priority
C) Switch serial number
D) Path Cost
Bridge Priority
The original 802.1D specification assigns what value to a 1 Gbps Interface?
A) 1
B) 2
C) 4
D) 19
4
All of the ports on a root bridge are assigned what role?
A) Root port
B) Designated port
C) Superior port
D) Master port
Designated Port
Using default settings, how long does a port stay in the listening state?
A) 2 seconds
B) 5 seconds
C) 10 seconds
D) 15 seconds
15 Seconds
Upon receipt of a configuration BPDU with the topology change flag set, how do the downstream switches react?
A) By moving all ports to a blocking state on all switches
B) By flushing out all MAC addresses from the MAC address table
C)By temporarily moving all non-root ports to a listening state
D) By flushing out all old MAC Addresses from the MAC address table
E) By updating the Topology Change version flag on the local switch database
By flushing out all old MAC addresses from the MAC address table
Which of the following are not RSTP port states?
A) Blocking
B) Listening
C) Learning
D) Forwarding
Blocking
Listening
T / F - In a large Layer 2 switch topology, the infrastructure must fully converge before any packets can be forwarded.
False
T / F - In a large Layer 2 switch topology that is running RSTP, the infrastructure must fully converge before any packets can be forwarded.
False
A network port that connects to the root bridge or an upstream switch in the spanning-tree topology
Root Port
A network port that receives and forwards BPDU frames to other switches.
Designated Port
A network port that is nor forwarding traffic because of STP calculations
Blocking Port
T/F - The root bridge is the least important switch in the Layer 2 topology.
False - It is the most important switch.
T/F - The root bridge’s ports are all in a listening state.
False - they’re all in a forwarding state.
T/F - The root bridge’s ports are all designated ports.
True
__________ is the network packet used for switches to identify a hierarchy and notify of changes in the topology
BPUD (Bridge Protocol Data Unit)
__________ is the type of BPDU used to identify the root bridge, root ports, designated ports, and blocking ports.
Configuration BPDU
__________ is the type of BPDU used to communicate changes in the layer 2 topology to other switches.
TCN (Topology Change Notification) BPDU
The combined cost for a specific path toward the root switch
Root Path Cost
This 4-bit value indicates the preference for a switch to be the root bridge.
System Priority
This 12-bit value indicates the VLAN that the BPDU correlates to.
System ID Extension
This is a combination of the root bridge system MAC address, system ID extension, and system priority of the root bridge
Root Bridge Identifier
This is a combination of the local switch’s bridge system MAC address, system ID extension, and system priority of the local bridge.
Local Bridge Identifier
The maximum length of time that passes before a bridge port saves its BPDU information.
Max Age
T/F - The default Max Age is 20 seconds.
True
The time that a BPDU is advertised out of a port.
Hello Time
T/F - The default value of the Hello Timer is 2 seconds
True
The amount of time that a port stays in a listening and learning state.
Forward Delay
T/F - the default value for the Forward Delay is 15 seconds
True
Which of the following are RSTP port types?
A) Root Port
B) Designated Port
C) Alternate Port
D) Backup Port
E) All of the above
All of the Above
__________ is the RSTP port at the edge of the network where hosts connect to the Layer 2 topology with one interface and can’t create a loop.
Edge Port
__________ is a RSTP port that has received a BPDU
Non-Edge Port
__________ is a RSTP port that connects to another RSTP switch with full duplex.
Point-to-Point Port
