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NEW QUESTION: 1
Which statement is true about TCN propagation?
A. The root bridge must flood this information throughout the network.
B. A TCN is generated and sent to the root bridge.
C. The originator of the TCN immediately floods this information through the network.
D. The TCN propagation is a two step process.
Answer: B
Explanation:
Explanation New Topology Change Mechanisms When an 802.1D bridge detects a topology change, it uses a reliable mechanism to first notify the root bridge. This is shown in this diagram:
Once the root bridge is aware of a change in the topology of the network, it sets the TC flag on the
BPDUs it sends out, which are then relayed to all the bridges in the network. When a bridge
receives a BPDU with the TC flag bit set, it reduces its bridging-table aging time to forward delay
seconds. This ensures a relatively quick flush of stale information. Refer to Understanding
Spanning-Tree Protocol Topology Changes for more information on this process. This topology
change mechanism is deeply remodeled in RSTP. Both the detection of a topology change and its
propagation through the network evolve.
Topology Change Detection
In RSTP, only non-edge ports that move to the forwarding state cause a topology change. This
means that a loss of connectivity is not considered as a topology change any more, contrary to
802.1D (that is, a port that moves to blocking no longer generates a TC). When a RSTP bridge
detects a topology change, these occur:
It starts the TC While timer with a value equal to twice the hello-time for all its non-edge
designated ports and its root port, if necessary.
It flushes the MAC addresses associated with all these ports.
Note: As long as the TC While timer runs on a port, the BPDUs sent out of that port have the TC
bit set.
BPDUs are also sent on the root port while the timer is active.
Topology Change Propagation
When a bridge receives a BPDU with the TC bit set from a neighbor, these occur:
It clears the MAC addresses learned on all its ports, except the one that receives the topology
change.
It starts the TC While timer and sends BPDUs with TC set on all its designated ports and root port
(RSTP no longer uses the specific TCN BPDU, unless a legacy bridge needs to be notified).
This way, the TCN floods very quickly across the whole network. The TC propagation is now a one
step process. In fact, the initiator of the topology change floods this information throughout the
network, as opposed to 802.1D where only the root did. This mechanism is much faster than the
802.1D equivalent. There is no need to wait for the root bridge to be notified and then maintain the
topology change state for the whole network for <max age plus forward delay> seconds.
In just a few seconds, or a small multiple of hello-times, most of the entries in the CAM tables of the entire network (VLAN) flush. This approach results in potentially more temporary flooding, but on the other hand it clears potential stale information that prevents rapid connectivity restitution.
Reference http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml
NEW QUESTION: 2
Refer to the exhibit.
Which statement about the R1 configuration is true?
A. It supports the service timestamps log uptime command to display time stamps.
B. Log message sequence numbering is disabled.
C. The logging of warning messages is disabled.
D. The logging buffer command was used to increase the default of the buffer.
Answer: B
Explanation:
To disable sequence numbers, use the no service sequence-numbers global configuration command.
This example shows part of a logging display with sequence numbers enableD.
000019: %SYS-5-CONFIG_I: Configured from console by vty2 (10.34.195.36)
In this example we see the absence of sequence numbers on the log messages.
Not A: In this example there are no time stamps or uptimes shown in the logs.
Not B: The default buffer size is 4096 bytes.
Not C: The logging level in this example is informational (level 6), which will display levels 0-6 in the logs. Warnings
are level 4.
NEW QUESTION: 3
If 34% of 360 equals 7.5% of h, what is h
Column A - h
Column B - 1634
A. if the two quantities are equal
B. if the quantity in Column A is greater
C. if it is impossible to determine which quantity is greater
D. if the quantity in Column B is greater
Answer: D