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43 Cards in this Set

  • Front
  • Back
What state is involved in nondesignated ports not participating in frame forwarding?
blocking state
What contains a priority value and the MAC address?
Bridge ID
Customizeable Value used to influence which switch becomes root.
Bridge Priority
Frame containing STP information exchanged between switches.
Bridge protocol data unit
Non-root ports that are still permitted to forward traffic
Designated ports
What state is involved in a port being administrativly shut down
disabled state
What is the time spent in the listening and learning state?
forward delay
What state is involved in time spent in the listening and learning states?
forwarding state
What is the time between each BPDU sent on a port?
hello time
What state is involved in building the MAC address table, but does forward user data frames?
learning state
What state is involved in sending and receiving BPDU's, but does not lean addresses or forward frames?
listening state
Length of time a port save BPDU information?
maximum age
Ports in a blocking state to prevent loops
non designated ports
Cisco technology used on access ports to bypass the listening and learning states
Portfast
The switch with the lowest BID
Root bridge
What are switch ports closest to the root bridge
root ports
Published as IEE 802.1d in 1990
Spanning Tree protocol
Used to determine which switch ports on a network need to be blocking in order to prevent loops from occurring
Spanning tree alogorithm
Number of switches a frame has to traverse to travel between the two farthest points within a broadcast domain
switch diameter
How would a switch determine that another switch is now the root bridge?
It would read the root ID information from the BPDU frame
how does the STA determine path cost?
by summing up the individual port costs along the path from the destination to the root bridge
What is the IEEE spec cost for 10Gps revised and previous?
2 revised, 1 previous
What is the IEEE spec cost for 1Gps revised and previous?
4 revised, 1 previous
What is the IEEE spec cost for 100Mps revised and previous?
19 revised, 10 previous
What is the IEEE spec cost for 10Mps revised and previous?
100 revised , 100 previous
Name the separate BID fields in a BPDU frame.
Priority, MAC address ID, Extended system ID.
What is the port priority value range, and the increments? what is the default?
0 to 240 in increments in 16, defaults is 128.
The root bridge automatically configures all of its switch ports to what role?
Designated role
name the 5 STP ports
blocking, listening, learning, forwarding, disabled
What is the hello time default timer as well as it's range?
default is 2 seconds, range is between 1 and 10 seconds.
what two conditions will cause a switch to detect that there has been a topology change?
when a port that was forwarding goes down or when a port is transitioning to forwarding
when a switch detects a topology change, what does it do if it is not the root bridge?
The switch notifies the root bridge , the root bridge broadcasts the information to the whole broadcast domain.
when a switch need sot signal a topology change what does it send and from where?
it sends a Topology Change Information (TCN) BPDUs on the root port.
name the 4 properties of PVST
uses the Cisco proprietary ISL trunking protocol
Each VLAN has an instance of spannig tree
Ability to load balance traffic at layer 2.
Includes extensions backbone fast, uplink fast, and port fast
name 3 properties of PVST+
supports ISL and IEEE802.1q trunking
supports cisco proprietary STP extensions
Adds BPDU guard and root guard enhancements.
name 2 properties of Rapid PVST+
based on IEEE802.1w
has faster convergence than 802.1d
name 3 properties of RSTP
introduced in 1982 and provides faster convergence than 802.1d
implements generic versions of the Cisco-proprietary STP extensions.
IEEE has incorporated RSTP into 802.1d, identifying the specification as IEEE802.1d-2004
name 3 properties of MSTP
multiple VLANs can be mapped to the same spanning-tree instance.
inspired by teh Cisco Multiple Instances Spanning Tree Protocol (MISTP)
IEEE 802.1Q (2003) now includes MSTP
what are two problems with redundant switched ethernet topologies?
broadcast storms
multiple frame copies
which three timers determine the spanning tree protocol performance and state changes
hello time
forward delay
maximum age
when implementing RSTP for non-edge ports, which two categories of link type are available?
shared
point to point
what method does RSTP use to decrease the time it takes to designate a new root port when the existing root port fails?
pre-negotiated alternate ports for the root port
a switch currently has only one vlan configured and is running a single instance of rapid spanning tree, what action will create a second rapid spanning tree?
assigning a port to a vlan other then vlan 1