200-301 ccna exam questions

200-301 ccna exam questions.Output queue:0/40 (size/max) 5minute input rate 0 bits/sec, 0 packets/sec 5minute output rate 0bits/sec, 0 packets/sec1453 packetsinput, 138334 bytes, 0no buffer Received 1418 broadcasts(325 multicasts) 0 runts, 0giants, 0throttles 0 input errors, 0 CRC, 0 frame, 0overrun, 0 ignored 0 watchdog, 325 multicast, 0pause input 0 input packets with dribble conditiondetected 33640 packets output, 2651335 bytes, 0 underruns 0 output errors, 0collisions, 1 interface resets 0 unknown protocol drops 0 babbles, |o late collision, 0 deferred 0 lost carrier, 0 no carrier, 0pause output 0 output buffer failures, 0 output buffersswapped outAlthough both of the above commands are useful, only the show interfaces status command shows how the switch determines the interface rate and duplex method. The output of this command identifies the autonegotiation setting with a %-". For example, "a-fijll" indicates an auto-negotiated full-duplex method, while "fill" indicates a manually configured full-duplex method. The shaded command output in the example indicates that auto-negotiation is used on F0/11 and F0/12±.F0/11: The interface is configured for 100 Mbit/s (no a-, indicating a constant rate), full duplex with auto-negotiation (a-fiill).F0/12:This interface contains two values both obtained by auto-negotiation (both contain an a- of a-100 and a-full). o Note that the Show interfacesFaO/12 command (no status option) identifies the rate and duplex, but does not specify how the switch is informed of or sets these values. (4) Rate and duplex related issuesWhen performing troubleshooting, it can be useful to look at the rate and duplex of the devices on both ends of the link. Devices located at both ends of the link do not have to use the same rate or duplex settings so that they can be easily distinguished. /gg-rate mismatch: If the ends of the Ethernet link use different rates, then the interface status of both devices should show "notersion connected" or "donw/down". Duplex mismatch: If two devices are using the same rate with different duplex settings, the interface is available but other performance metrics will be problematic at the half-duplex end of the link.Interestingly, Cisco switches will actually make it difficult for rate mismatches to occur. Obviously, if the devices at both ends of the link use the auto-negotiation mechanism, they will choose to use the same rate. If the adjacent devices have auto-negotiation disabled, then the Cisco switch will still find the correct rate and use that rate even without auto-negotiation unless it is pre-configured with the speed command to use a pre-determined rate. When configured with the speed command, such as speed100, the switch interface must use that rate as much as possible.60 Chapter 3 Troubleshooting LAN SwitchingTip: Cisco switches do not have a single command that disables the IEEE auto-negotiation mechanism; however, configuring the rate command and duplex command to a specific rate and duplex has the ability to disable the auto-negotiation mechanism.