CCNA（200-125)V3.0(2018.3.12)

ccna-200-125-v3-0-2018-3-12

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525824

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If the primary root bridge experiences a power loss, which switch takes over?

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525569

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When an interface is configured with PortFast BPDU guard, how does the interface respond when it receives a BPDU?

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525827

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A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency. The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information?

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525574

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What are three characteristics of the TCP protocol? (Choose three.)

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525830

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Which three statements about IPv6 prefixes are true? (Choose three.)

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525842

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Which command can you enter to display duplicate IP addresses that the DHCP server assigns?

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525844

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Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? (Choose three.)

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Explanation

The minimum mac of B is the root bridge, and the two ports of B are the designated ports. F0/0 of A and F0/0 of C are root ports. A's mac is smaller, A's F0/1 is specified Port, C's F0/1 blocked

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The network administrator cannot to switch 1 over a telnet session,although the hosts attached to switch 1 can ping the interface Fa0/0 of the router.Given the information in the graphic and assuming that the router and switch2 are configured properly,which of the following commands should be issued on switch 1 to correct this problem?

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525846

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Refer to the exhibit. Each of these four switches has been configured with a hostname, as well as being configured to run RSTP. No other configuration changes have been made. Which three of these show the correct RSTP port roles for the indicated switches and interfaces? (Choose three.)

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Explanation

As shown in the figure, each switch is configured with a host name, and RSTP is also running. No other configuration is done. Which three options are correct? Describe the port role of RSTP? Test site analysis: 1. Determine the root bridge. By comparing the Mac addresses of the bridges, the bridge with the smallest Mac address is the root bridge, so the root bridge is C, and all ports on the root bridge. Is the designated port. 2. Determine the port on the non-root bridge. On the same switch, the port that has a lower cost to the root bridge becomes the root port. and so SwitchA Fa0/1, SwitchD Gi0/2, and SwitchB Gi0/1 become the RPs on the switch. 3. Determine the designated port on each network segment. SWA--SWB segment: The cost of the F0/2 port of the SWA is 19, and the cost of the G0/2 port of the SWB is 4. +19=23, so F0/2 of SWA is the designated port. SWB--SWD segment: SW0 G0/1 port cost is 19+19=38, SWD G0/1 The port cost is 19, so the G0/1 port of the SWD is the designated port. 4. The G0/2 port of the remaining SWB is neither the designated port nor the root port, and is in a blocked state. Note: The cost of the 100M link is 19.1000M and the link cost is 4.

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Which feature builds a FIB and an adjacency table to expedite packet forwarding?

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525848

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Which command can you enter to verify that a 128-bit address is live and responding?

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525849

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What are two reasons that duplex mismatches can be difficult to diagnose? (Choose two.)

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525850

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Which condition indicates that service password-encryption is enabled?

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525852

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Which protocol advertises a virtual IP address to facilitate transparent failover of a Cisco routing device?

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525853

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What is the correct routing match to reach 172.16.1.5/32?

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