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| Question ID 18602 | Refer to the exhibit.
Which two statements are true about the displayed STP state? (Choose two.)
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| Option A | The STP version configured on the switch is IEEE 802.1w.
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| Option B | Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.
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| Option C | The switch does not have PortFast configured on Gi0/15.
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| Option D | BPDUs with the TCN bit set are transmitted over port channel 1.
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| Correct Answer | C,D |
Explanation Explanation: A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCNs were sent so we know that Gi 0/15 does not have portfast enabled. TCNs are sent using BPDUs over the root port, which we see is port channel 1.
| Question ID 18603 | Which three statements are true about PPP CHAP authentication? (Choose three.)
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| Option A | PPP encapsulation must be enabled globally.
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| Option B | The LCP phase must be complete and in closed state.
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| Option C | The hostname used by a router for CHAP authentication cannot be changed.
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| Option D | PPP encapsulation must be enabled on the interface.
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| Option E | The LCP phase must be complete and in open state.
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| Option F | By default, the router uses its hostname to identify itself to the peer.
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| Correct Answer | D,E,F |
Explanation Explanation: Point-to-Point Protocol (PPP) authentication issues are one of the most common causes for dialup link failures. This document provides some troubleshooting procedures for PPP authentication issues. Prerequisites ✑ Enable PPP encapsulation ✑ The PPP authentication phase does not begin until the Link Control Protocol (LCP) phase is complete and is in the open state. If debug ppp negotiation does not indicate that LCP is open, troubleshoot this issue before proceeding. Note. By default, the router uses its hostname to identify itself to the peer. However, this CHAP username can be changed through the ppp chap hostname command. Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol- ppp/25647-understanding-ppp-chap.html