Spanning Tree Protocol Q/A's Flashcards
Rapid Per-VLAN Spanning Tree Protocol (RPVST+) prevents routing loops for each what in Spanning Tree Protocol?
Individual VLAN instance.
Rapid Per-VLAN Spanning Tree blocks what two states for faster convergence?
blocking and listening
The root port in Spanning Tree Protocol is directly connected to a?
The root bridge is selected by the highest or lowest path cost?
Root Bridge Switch
Lowest path cost
The designated port in Spanning Tree Protocol forward frames to what?
each LAN-Local area Network
The alternate port in Spanning Tree Protocol is the next available what, to the root bridge?
backup port
The blocking port in Spanning Tree Protocol does what with all frames received on that port?
discards
In order what are the five transitioning states of Spanning Tree Protocol?
Disabled Blocking Listening Learning Forwarding Broken
In order what are the three transitioning states of RSTP-Rapid Spanning Tree Protocol?
Discarding “aka blocking port”
Learning
Forwarding
The Bridge Protocol Data Units-BPDU’s contain what type of information frames in Spanning Tree Protocol?
spanning tree topology
The two things that determine the root bridge switch are the two lowest what?
Bridge ID
Priority
Spanning Tree Protocol takes about how long before port forwarding starts?
15 Seconds for Listening and 15 Seconds for Learning (30 seconds)
The default Bridge Priority Value for Spanning Tree Protocol is?
32768
When the priority value is tied in Spanning Tree Protocol, what is used instead for the selection process?
lowest MAC address
Is Spanning Tree Protocol a routing protocol and does it perform load balancing?
What are the two main purposes of Spanning Tree Protocol?
no
prevent loops + best forwarding path
In Spanning Tree Protocol the ports that face away from the Root Bridge are called what type of ports?
Designated Ports
Spanning Tree Protocol sends BPDU’s to/from?
all ports
The main purpose of Spanning Tree “Root Guard”?
Prevent switch from becoming a root bridge
The ports on the root bridge are all what type of ports?
Designated ports
What are the two types of BPDU’s?
Configuration BPDU
TCN (Topology Change Notification) BPDU
The root path cost is always zero on the root bridge? True/False
True
Root port is selected in what order?
lowest path cost
lowest system priority
lowest mac address
lowest port priority
What is a P2P port type?
port that connects to another network device (PC or Switch)
What is P2P edge port type?
port that specifies port fast is enabled
When root guard is enabled and a superior BPDU is received on a configured port what happens?
Port goes into a Err-Disabled state
Does Portfast disable TCN Topology Change Notifications for access ports. True/False
True
The use of spanning-tree portfast trunk should only be used when?
What should this command not be use with?
With ports that are connecting to a single host, ex server with on NIC.
switches, bridges, etc
What is the purpose of using BPDU filter?
block BPDU’s from being transmitted out of a port
What is the purpose of STP Loop Guard?
prevent any alternative or root ports from becoming designated ports
What role does designated ports have?
forward data downstream to other switches/LANs
Why shouldn’t loop guard be enabled on portfast-enabled ports?
conflicts with the root/alternative port logic
What is Unidirectional Link Detection?
allows (bidirectional) two way monitoring of fiber-optic cables
