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Exam CCNA Cisco Certified Network Associate CCNA (v3.0)
Number 200-125
File Name Cisco.PracticeTest.200-125.v2017-01-06.228q.vcex
Size 10.88 Mb
Posted January 06, 2017
Downloaded 43

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Demo Questions

Question 1

Refer to the following sample output:

Which Cisco Internetwork Operating System (IOS) command produces this output?

  • A: show interfaces
  • B: show interfaces summary
  • C: show interfaces serial fast-ethernet
  • D: show interfaces fast-ethernet 0/0

Correct Answer: B

The show interfaces summary command will produce the given output. This command provides a summarized view of all interfaces configured on a device. 
The show interfaces command is incorrect because this command does not produce the displayed output. This command is used to view information regarding statistics for specific interfaces. Without specifying an interface, a section for each interface will display, as in the example below for FastEthernet0:

The show interfaces serial fast-ethernet command is incorrect because this is not a valid Cisco IOS command. 
The show interfaces fast-ethernet 0/0 command is incorrect. Although it produces similar output, that output only relates to the FastEthernet 0/0 interface. An example of this output follows:

Notice that the line of output that says FastEthernet0 is up, line protocol is up indicates that Layers 1 to 3 of the OSI Model are functioning correctly. Also, in the lower portion, there are no values in the error counters such as input errors, output errors, and so on. Finally, make note in line 8 where the interface is set to autosense both the duplex and the speed. Duplex and speed must be in agreement between the NIC on the host and the switch port. 

Routing Fundamentals 

Troubleshoot basic Layer 3 end-to-end connectivity issues 

Cisco > Cisco IOS Interface and Hardware Component Command Reference > show interfaces summary

Question 2

Which of the following is NOT a VLAN Trunking Protocol (VTP) mode of operation?

  • A: client
  • B: server
  • C: virtual
  • D: transparent

Correct Answer: C

Virtual is not a valid VTP mode of operation. There are three different VTP modes of operation: client, server, and transparent.
In client mode, a switch can synchronize VLAN information with the domain and forward advertisements. However, VLANs cannot be created, deleted, or modified from a switch in client mode. Also, a client mode switch does not save VLAN information in non-volatile Random Access Memory (NVRAM). It is stored in Flash in a file called vlan.dat. 
In server mode, a switch synchronizes the VLAN information with the domain, sends and forwards advertisements, and can create, delete, or modify VLANs. In server mode, VLAN information is stored in Flash in a file called vlan.dat. 
In transparent mode, a switch does not synchronize its VLAN configuration with the domain, but it forwards advertisements. VLANs can be created, deleted, or modified locally and VLAN configuration is saved in both the running-config file in RAM and in flash in a file called vlan.dat. 
LAN Switching Fundamentals 
Configure, verify, and troubleshoot VLANs (normal/extended range) spanning multiple switches 
Cisco > Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide, 12.2(25) > Understanding and Configuring VLANs, VTP, and VMPS

Question 3

A host is powered up, but the connected switch port does not turn amber or green.  
Which of the following methods would you use to troubleshoot the situation? (Choose three. Each answer is a complete solution.)

  • A: Ensure the switch is powered up.
  • B: Reinstall Windows on the workstation.
  • C: Reseat the cable.
  • D: Ensure that the cable is straight-through.
  • E: Ensure that the cable is crossover.

Correct Answer: ACD

A black or unlit switch port LED is symptomatic of a Layer 1 problem. The port LED should first turn amber and then turn solid green when a host is powered up. The amount of time it takes to turn solid green will depend on the Spanning Tree Protocol configuration. If the LED is unlit, you should ensure that the switch is powered up and that a straight-through cable is used to connect a switch port to a host, such as a workstation or a printer. If the switch is powered up and a straight-through cable is used, reseat the cable to ensure a firm connection. 
Reinstalling Windows on the workstation will not help because this is a Layer 1 problem having to do with the switch having power or the use of proper cabling. 
You should not ensure that the cable is crossover, because straight-through (patch) cables are used to connect switch ports to hosts. 
LAN Switching Fundamentals 
Troubleshoot interface and cable issues (collisions, errors, duplex, speed) 
Cisco > Catalyst 2960 Switch Hardware Installation Guide > LEDs

Question 4

Click and drag the RSTP port state on the left to its matching equivalent STP role, on the right. RSTP port states may be used more than once, and it may not be necessary to use all RSTP port states. 

Correct Answer: Exam simulator is required

Rapid Spanning Tree Protocol (RSTP) was developed to reduce the high convergence times required in Spanning Tree Protocol (STP), and introduces the alternate port and backup port. RSTP is an Institute of Electrical and Electronics Engineers (IEEE) standard, 802.1w, and is interoperable with 802.1d (STP). There are fewer transitional states used in RSTP than STP. In RSTP, there are only Forwarding, Learning, and Discarding. The three states are defined as follows:
Forwarding - the state of all root ports and designated ports. The port is passing traffic. 
Learning - the state of a port that was formerly discarding but due to a change in the topology (link down) it has transitioned to learn its new state. The port could return to discarding or move to forwarding depending on the new topology needs 
Discarding - the state of all non-root and non- designated ports. The port is not passing traffic to prevent potential switching loops. 
RSTP can reconfigure the spanning tree in less than a second, compared to the 50 seconds that STP may take. This is achieved through having fewer transition states, the use of alternate and backup ports, and faster transitions. 
LAN Switching Fundamentals 
Configure, verify, and troubleshoot STP protocols 
Cisco > Technology Support > LAN Switching > Spanning Tree Protocol > Technology White Paper > Understanding Rapid Spanning Tree Protocol (802.1w) 
Cisco Support > Technology Support > LAN Switching > Spanning Tree Protocol > Troubleshoot and Alerts > Troubleshooting TechNotes > Understanding Rapid Spanning Tree Protocol (802.1w) 
CCNA Routing and Switching Complete Study Guide: Exam 100-105, Exam 200-105, Exam 200-125, 2nd Edition, Chapter 2: LAN Switching Technologies - Configure, verify, and troubleshoot STP protocols

Question 5

Which of the following commands will enable a global IPv6 address based on the Modified EUI-64 format interface ID?

  • A: ipv6 address 5000::2222:1/64
  • B: ipv6 address autoconfig
  • C: ipv6 address 2001:db8:2222:7272::72/64 link-local
  • D: ipv6 enable

Correct Answer: B

To configure the interface to create a global IPv6 address based on the Modified EUI-64 format interface ID, you must enable stateless autoconfiguration. In stateless autoconfiguration, the interface will receive the network prefix from the router advertisement (RA) and generate a full IPv6 address by spreading the 48-bit MAC address of the interface across 64 bits to complete the address. This can all be done simply by executing the ipv6 address autoconfig command at the interface configuration prompt. 
The command ipv6 address 5000::2222:1/64 is used to manually assign a full IPv6 address to the interface without using stateless autoconfiguration or the eui-64 keyword to manually specify the first 64 bits and allow the last 64 bits to be generated from the MAC address of the interface.
The command ipv6 address 2001:db8:2222:7272::72/64 link local is used to configure a link-local address manually without allowing the system to generate one from the MAC address, which is the default method.
The command ipv6 enable is used to allow the system to generate a link-local address from the MAC address. Because this is the default behavior, the command is not required if any other ipv6 commands have been issued. Regardless of how many manual IPv6 addresses you configure, a link local address is always generated by default. 
Network Fundamentals 
Configure, verify, and troubleshoot IPv6 addressing 
Cisco > Product Support > Security > Cisco ASA 5500-X Series Firewalls > Configure > Configuration Guides > Cisco Security Appliance Command Line Configuration Guide, Version 7.2 > Chapter: Configuring IPv6 > Enforcing the Use of Modified EUI-64 Interface IDs in IPv6 Addresses
Cisco > Support > Cisco IOS IPv6 Command Reference > ipv6 address





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