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| Question ID 16035 | Which two states are the port states when RSTP has converged? (Choose two.)
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| Option A | discarding
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| Option B | listening
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| Option C | learning
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| Option D | forwarding
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| Option E | disabled
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| Correct Answer | A,D |
Explanation Explanation: There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state. STP (802.1D) Port State RSTP (802.1w) Port State Is Port Included in Active Topology? Is Port Learning MAC Addresses? Disabled Discarding No No Blocking Discarding No No Listening Discarding Yes No Learning Learning Yes Yes Forwarding Forwarding Yes Yes Reference: http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cf a.shtml#states
| Question ID 16036 | Which two protocols are used by bridges and/or switches to prevent loops in a layer 2
network? (Choose two.)
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| Option A | 802.1d
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| Option B | VTP
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| Option C | 802.1q
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| Option D | STP
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| Option E | SAP
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| Correct Answer | A,D |
Explanation Explanation: This question is to examine the STP protocol. STP (802.1d) is used to prevent Layer 2 loops. 802.1q is a Frame Relay protocol which belongs to VLAN. SAP is a concept of the OSI model.