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Exam CCNA Cisco Certified Network Associate CCNA (v3.0)
Number 200-125
File Name Cisco.Braindumps.200-125.2017-09-22.1e.229q.vcex
Size 11.17 Mb
Posted September 22, 2017
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Download Cisco.Braindumps.200-125.2017-09-22.1e.229q.vcex

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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

Question 6

Which of the following commands is used to verify the link-local, global unicast, and multicast addresses of an IPv6 router?

  • A: show ipv6 neighbors (only link-local addresses)
  • B: show ipv6 route
  • C: show ipv6 protocols
  • D: show ipv6 interface

Correct Answer: D

The show ipv6 interface command is used to verify the link-local, global unicast, and multicast addresses assigned to an IPv6-enabled router interface. The show ipv6 interface command displays information regarding that interface, such as the physical state, MTU, and IPv6 enable/disable state. 
Here is the partial output of the show ipv6 interface command on an IPv6-enabled router named rtrA:

In the sample output, you can see that the Fa0/1 interface of rtrA has the link-local address FE80::6339:7BFF:FE5D:A031/64 and the global unicast address 2001:7067:90D1:1::1. The global unicast address is not in EUI-64 format because when the ipv6 address command was issued, the eui64 keyword was not used. If the EUI-64 format had been specified with the eui64 keyword, the global unicast address would have been 2001:7067:90D1:1:6339:7BFF:FE5D:A031.
An IPv6-enabled interface has not only a link-local and global unicast address, but also one or more multicast addresses. A multicast address is an IPv6 address that has the prefix FF00::/8. These addresses are assigned to interfaces of different nodes such that they appear as a logical group. This implies that when a packet is destined for a multicast address, that packet is delivered to all the interfaces that have the same multicast address. The various multicast groups are as follows:
FF02::1 Indicates the group of all the nodes on the local segment
FF02::2 Indicates the group of all the routers on the local segment
FF02::1:FF00:0/104 Indicates a solicited-node multicast group for every unicast or anycast address assigned to the interface
You can also notice in the sample output that the Fa0/1 interface belongs to three multicast groups: FF02::1, FF02::2, and FF02::1:FF5D:A031. The first two multicast groups refer to the all-host and all-router multicast groups, respectively. The third group, FF02::1:FF5D:A031, is the solicited-node multicast address. This address is created for every unicast or anycast address. A solicited-node multicast address is determined by assigning the least significant 24 bits of the unicast address to the least significant 24 bits of the FF02::1:FF00:0 address.
The show ipv6 neighbors command displays the link-local /global unicast addresses of the neighbors, including other information such as state and the next-hop interface. 
The show ipv6 route command is used to view the IPv6 routing table on the router. This command displays the prefixes, administrative distance, metric, and next-hop addresses for various IPv6 networks. 
The show ipv6 protocols command is used to view the active routing protocols for IPv6 on the router. This command shows the interfaces, redistribution status, and summarization status about each of the routing protocols enabled on the router. 

Network Fundamentals 

Configure, verify, and troubleshoot IPv6 addressing 

Cisco IOS IPv6 Command Reference > show ipv6 eigrp topology through show ipv6 nat statistics > show ipv6 interface 
Cisco IOS IPv6 Command Reference > show ipv6 nat translations through show ipv6 protocols > show ipv6 neighbors 
Cisco IOS IPv6 Command Reference > show ipv6 nat translations through show ipv6 protocols > show ipv6 protocols 
Cisco > Products & Services > Cisco IOS and NX-OS Software > Cisco IOS Technologies > IPv6 > Product Literature > White Papers > Cisco IOS IPv6 Multicast Introduction 
Cisco > IPv6 Implementation Guide, Release 15.2M&T > Implementing IPv6 Multicast

Question 7

Which type of Category 5 unshielded twisted-pair (UTP) cable is used to work as a trunk between two switches?

  • A: RJ-45 straight-through
  • B: RJ-41 crossover
  • C: RJ-11 straight-through
  • D: RJ-45 crossover

Correct Answer: D

An RJ-45 crossover cable connects two switches. To act as a trunk a trunking protocol such as ISL or 802.1q must be configured on the link. . A trunk is a connection between two switches that is used to carry traffic from multiple VLANs. 
In general, the rule to follow when choosing between a straight-through and a crossover cable is:
When connecting like devices (i.e. router to router, switch to switch), use a crossover cable. 
When connecting dissimilar devices (i.e. switch to router), use a straight-through cable. 
The one exception to this rule is when connecting a computer NIC to a router, in which case a crossover cable is used. Be aware, however, that many devices, including network cards in computers, now have the ability to sense automatically when they are connected to a like device and adapt to the connection, making crossover cables unnecessary in those situations. 
You should not choose an RJ-45 straight-through cable. The cable type to be used depends on the circuit connection of the hardware. To connect two switches, a crossover cable is required. The difference between a straight-through cable and a crossover cable lies in the location of the wire termination on the two ends of an RJ-45 cable. If the UTP cable wire connects Pin 1 of one side to Pin 1 of other side and Pin 2 to 2 through all eight pins of the RJ 45 connector, the cable is said to be straight-through. On the other hand, if Pin 1 of one side of an RJ-45 cable connects to Pin 3 of the other end, and Pin 2 connects to Pin 6 of the other end, it is known as a crossover cable. A straight-through cable is used to connect a computer's network interface card (NIC) to a hub or switch. 
You should not choose an RJ-41 crossover cable. RJ-41 is a single-line universal data jack normally associated with fixed-loss loop (FLL) or programmed (P) modems. It is not used between switches. 
You should not choose an RJ-11 straight-through cable type. RJ-11 UTP cables have four pins and are used to connect voice instruments. RJ-11 UTP cables are not intended for connecting computers and transferring data. They are commonly used for telephones and modems. 
Note: Cisco switches have an auto-mdix feature that notices when the wrong cabling pinouts are used, and readjusts the switch's logic so that the cable will work.
Network Fundamentals 
Select the appropriate cabling type based on implementation requirements 
Cisco Documentation > Internetwork Design Guide > Designing Switched LAN Internetworks > Technologies for Building Switched LAN Internetworks 
Cisco > Troubleshooting Technotes > Cisco 7000 Series Routers > Cabling Guide for Console and AUX Ports > Types of RJ-45 Cabling

Question 8

A router is running a classful routing protocol. Which command will enable this router to select a default route when routing to an unknown subnet of a network for which it knows the major network?

  • A: ip classless
  • B: no ip classless
  • C: auto-summary
  • D: no auto-summary

Correct Answer: A

The ip classless command causes a routing protocol to change its default behavior of discarding any traffic that is bound for unknown subnets of a known classful network. If the command is enabled, the router tries to match the most number of bits possible against the route in its routing table. Alternatively, the router will use the default route rather than dropping the packet. 
For an example of this behavior, examine the diagram below. The ip route serial 0/0 command has been issued on Router B. If the network is unknown to Router B, then under normal circumstances, Router B would NOT use its configured default route. Instead, it would drop any packets addressed to that unknown network, because when a router knows a route to a major classful network or its subnets (in this case, and, it will not use a statically configured default route to forward traffic to an unknown subnet of that network (in this case In the scenario described in the diagram, Router B will drop the packet. However, if the ip classless command has been executed, it will use the default route and send the traffic to Router A. 

The ip classless command is a global configuration mode command enabled by default in Cisco IOS version 12.0 and later. If the default route is learned from IS-IS or OSPF, as opposed to being statically configured as in the above example, the ip classless command is not necessary for the router to use the default route. 
The no ip classless command on routers will disable the forwarding of packets destined to an unknown subnet of a known classful network. Therefore, it is an incorrect option. 
The auto-summary command is used to allow automatic summarization of subnet routes into network-level routes. This is a command executed in router configuration mode. 
Classless routing protocols such as Routing Information Protocol version 2 (RIPv2) and Enhanced Interior Gateway Routing Protocol (EIGRP) perform automatic route summarization at classful boundaries. The no auto-summary command is used to turn off this route summarization. 

Routing Fundamentals 

Configure, verify, and troubleshoot IPv4 and IPv6 static routing 

Cisco > Articles > Cisco Certification > CCNP > CCNP Self-Study: Advanced IP Addressing
Cisco > Cisco IOS IP Addressing Services Command Reference > IP Addressing Commands > ip classless

Question 9

Which Cisco IOS command is used to configure encapsulation for a PPP serial link on a Cisco router?

  • A: encapsulation ppp
  • B: encapsulation ip ppp
  • C: ip encapsulation ppp
  • D: encapsulation ppp-synch

Correct Answer: A

PPP is a Layer 2 protocol encasulation type that supports both synchronous and asynchronous circuits and provides built-in security mechanaims. The encapsulation ppp interface configuration mode command is used to configure encapsulation for a PPP (Point to Point Protocol) serial link on a Cisco router. PPP encapsulation provides for router-to-router and host-to-network connections over both synchronous and asynchronous circuits. Serial links are configured to use Cisco High Level Data Link Control (HDLC) encapsulation, by default, on Cisco routers. The Cisco version of HDLC is incompatible with the industry standard version used on other router brands because it contains a type field that identifies the underlying network protocol being encapsulated by HDLC. This is a beneficial feature of Cisco HDLC but makes it incompatible with other router brands. 
For this reason, a Cisco router that is going to be connected to a non-Cisco router should be configured to use PPP instead of the default. The encapsulation ppp interface configuration mode command will do this. If you set one of the routers for PPP and leave the other router at the default encapsulation for a serial connection, the connection will fail due to incompatible encapsulation. 
You would use the show run command to verify matching encapsulation types. In the partial output of the show run command for two routers shown below, it can be seen that although one of the routers has the encapsulation ppp command in its configuration, the other does not. The absense of the encapsulation ppp command means that the default HDLC is being used. This incompatibility will cause both routers to report a serial interface up, line protocol down condition since the connection is live, but the Layer 2 framing is misconfigured. 

If authentication between the routers is also required, the authentication pap, authentication ms-chap, or authentication chap commands could be used to apply Password Authentication Protocol (PAP), Microsoft Challenge Authentication Protocol (MS-CHAP), or Challenge Authentication Protocol (CHAP) authentication to the connection, respectively. 
A full configuration of a serial link for using PPP with authentication is as shown below:
Router1(config)#interface Serial0 
Router1(config-if)#encapsulation ppp 
Router1(config-if)#ppp authentication pap 

Note above that the third line enables PAP authentication, which is not secure. Alternately, you can use CHAP authentication (which is secure) with the ppp authentication chap command. Regardless of which authentication mechanism you choose, these authentication commands will only be accepted on an interface where PPP encapsulation has been enabled, which rules out any non-serial interfaces. 
The third type of encapsulation that can be configured on a serial WAN link is Frame Relay, which can be selected with the encapsulation frame relay command under the interface. 
In summary, the three encapsulation types available for WAN serial links are PPP, HDLC, and Frame Relay. The command for each is as follows, executed under the interface configuration prompt:
encapsulation ppp 
encapsulation hdlc 
encapsulation frame relay 

All other options are invalid commands. 

WAN Technologies 

Configure and verify PPP and MLPPP on WAN interfaces using local authentication 

Internetworking Technology Handbook > WAN Technologies > Point-to-Point Protocol

Question 10

A user in your network is having trouble accessing resources and the Internet. You decide to examine the partial output of the ipconfig/all command on his machine. The output is shown below:

Which of the following statements describes the user's problem?

  • A: The default gateway address is incorrect
  • B: The IP address of the device is incorrect
  • C: There is no DNS server configured
  • D: IP routing is not enabled

Correct Answer: B

The IP address of the device is incorrect. It is not in the same subnet as the default gateway address. While it is possible that the default gateway address is incorrect, that is not as likely a reason, given the fact that the DNS server is also in the same IP subnet as the default gateway. 
There is a DNS server configured and its IP address is If a DNS server were not configured, this user would be unable to access the Internet, even if all IP addressing problems were resolved. 
IP routing is NOT enabled. However, it is not required to be enabled because this device is not acting as a router. The device does not need IP routing enabled to access resources and the Internet if all other IP addressing issues are resolved. 
Infrastructure Services 
Describe DNS lookup operation 
PChuck's Network > Microsoft Windows Networking, Security, and Support > Reading IPConfig and Diagnosing Network Problems





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