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