[Free] 2017(Oct) Dumps4cert Testinsides Cisco 200-125 Dumps with VCE and PDF Download 81-90

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 81 – (Topic 2)

What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch?

  1. It creates a VLAN 999 interface.

  2. It designates VLAN 999 for untagged traffic.

  3. It blocks VLAN 999 traffic from passing on the trunk.

  4. It designates VLAN 999 as the default for all unknown tagged traffic.

Answer: B Explanation:

Configuring the Native VLAN for Untagged Traffic

A trunk port configured with 802.1Q tagging can receive both tagged and untagged traffic. By default, the switch forwards untagged traffic in the native VLAN configured for the port. The native VLAN is VLAN 1 by default.

Question No: 82 – (Topic 2)

Refer to the exhibit.

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All switch ports are assigned to the correct VLANs, but none of the hosts connected to SwitchA can communicate with hosts in the same VLAN connected to SwitchB. Based on the output shown, what is the most likely problem?

  1. The access link needs to be configured in multiple VLANs.

  2. The link between the switches is configured in the wrong VLAN.

  3. The link between the switches needs to be configured as a trunk.

  4. VTP is not configured to carry VLAN information between the switches.

  5. Switch IP addresses must be configured in order for traffic to be forwarded between the switches.

Answer: C Explanation:

In order to pass traffic from VLANs on different switches, the connections between the switches must be configured as trunk ports.

Question No: 83 – (Topic 2)

Which three are valid modes for a switch port used as a VLAN trunk? (Choose three.)

  1. transparent

  2. auto

  3. on

  4. desirable

  5. blocking

  6. forwarding

Answer: B,C,D Explanation:

These are the different types of trunk modes:

->ON: This mode puts the port into permanent trunk mode and negotiates to convert the link into a trunk link. The port becomes a trunk port even if the adjacent port does not agree to the change.

->OFF: This mode puts the port into permanent non-trunk mode and negotiates to convert the link into a non-trunk link. The port becomes a non-trunk port even if the adjacent port does not agree to the change.

->Desirable: This mode causes the port to actively attempt to convert the link into a trunk link. The port becomes a trunk port if the adjacent port is set to on, desirable,

or auto mode.

->Auto: This mode enables the port to convert the link into a trunk link. The port becomes a trunk port if the adjacent port is set to on or desirable mode. This is the default mode for Fast and Gigabit Ethernet ports.

->Nonegotiate: This mode puts the port into permanent trunk mode, but does not allow the port to generate Dynamic Trunking Protocol (DTP) frames. The adjacent port must be configured manually as a trunk port to establish a trunk link.

Question No: 84 – (Topic 2)

Refer to the exhibit.

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Switch port FastEthernet 0/24 on ALSwitch1 will be used to create an IEEE 802.1Q- compliant trunk to another switch. Based on the output shown, what is the reason the trunk does not form, even though the proper cabling has been attached?

  1. VLANs have not been created yet.

  2. An IP address must be configured for the port.

  3. The port is currently configured for access mode.

  4. The correct encapsulation type has not been configured.

  5. The “no shutdown” command has not been entered for the port.

Answer: C Explanation:

According to the output shown the switchport (layer 2 Switching) is enabled and the port is in access mode. To make a trunk link the port should configured as a trunk port, not an access port, by using the following command: (Config-if)#switchport mode trunk.

Question No: 85 – (Topic 2)

A switch is configured with all ports assigned to VLAN 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?

  1. More collision domains will be created.

  2. IP address utilization will be more efficient.

  3. More bandwidth will be required than was needed previously.

  4. An additional broadcast domain will be created.

Answer: D Explanation:

Each VLAN creates its own broadcast domain. Since this is a full duplex switch, each port is a separate collision domain.

Question No: 86 – (Topic 2)

Which of the following are benefits of VLANs? (Choose three.)

  1. They increase the size of collision domains.

  2. They allow logical grouping of users by function.

  3. They can enhance network security.

  4. They increase the size of broadcast domains while decreasing the number of collision domains.

  5. They increase the number of broadcast domains while decreasing the size of the broadcast domains.

  6. They simplify switch administration.

Answer: B,C,E Explanation:

When using VLAN the number and size of collision domains remain the same -gt;. VLANs allow to group users by function, not by location or geography -gt;.

VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network -gt;.

VLAN increases the size of broadcast domains but does not decrease the number of collision domains -gt;.

VLANs increase the number of broadcast domains while decreasing the size of the broadcast domains which increase the utilization of the links. It is also a big advantage of VLAN -gt;.

VLANs are useful but they are more complex and need more administration -gt;.

Question No: 87 – (Topic 2)

Which two commands can be used to verify a trunk link configuration status on a given Cisco switch interface? (Choose two.)

  1. show interface trunk

  2. show interface interface

  3. show ip interface brief

  4. show interface vlan

  5. show interface switchport

Answer: A,E Explanation:

Example output from these two commands: SW3#show interface trunk

Port Mode Encapsulation Status Native vlan Fa0/19 auto n-802.1q trunking 1

Fa0/20 auto n-802.1q trunking 1 Fa0/21 auto n-802.1q trunking 1 Fa0/22 auto n-802.1q trunking 1 Port Vlans allowed on trunk Fa0/19 1-4094

Fa0/20 1-4094

Fa0/21 1-4094

Fa0/22 1-4094

SW1#show interface fast 0/2 switchport Name: Fa0/2

Switchport: Enabled

Administrative Mode: dynamic desirable Operational Mode: down

Administrative Trunking Encapsulation: dot1q Negotiation of TrunkinG. On

Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none

Topic 3, Routing Technologies

Question No: 88 – (Topic 3)

Refer to the exhibit.

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For what two reasons has the router loaded its IOS image from the location that is shown? (Choose two.)

  1. Router1 has specific boot system commands that instruct it to load IOS from a TFTP server.

  2. Router1 is acting as a TFTP server for other routers.

  3. Router1 cannot locate a valid IOS image in flash memory.

  4. Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP server.

  5. Cisco routers will first attempt to load an image from TFTP for management purposes.

    Answer: A,C Explanation:

    The loading sequence of CISCO IOS is as follows: Booting up the router and locating the Cisco IOS

    1. POST (power on self-test)

    2. Bootstrap code executed

    3. Check Configuration Register value (NVRAM) which can be modified using the config- register command

      0 = ROM Monitor mode 1 = ROM IOS

      2 – 15 = startup-config in NVRAM

    4. Startup-config filE. Check for boot system commands (NVRAM) If boot system commands in startup-config

      1. Run boot system commands in order they appear in startup-config to locate the IOS

      2. [If boot system commands fail, use default fallback sequence to locate the IOS (Flash, TFTP, ROM)?]

        If no boot system commands in startup-config use the default fallback sequence in locating the IOS:

        1. Flash (sequential)

        2. TFTP server (netboot)

        3. ROM (partial IOS) or keep retrying TFTP depending upon router model

    5. If IOS is loaded, but there is no startup-config file, the router will use the default fallback sequence for locating the IOS and then it will enter setup mode or the setup dialogue.

Question No: 89 – (Topic 3)

A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS image. What function does the router perform next?

  1. It checks the configuration register.

  2. It attempts to boot from a TFTP server.

  3. It loads the first image file in flash memory.

  4. It inspects the configuration file in NVRAM for boot instructions.

Answer: A Explanation:

Default (normal) Boot Sequence

Power on Router – Router does POST – Bootstrap starts IOS load – Check configuration register to see what mode the router should boot up in (usually 0x2102 to read startup- config in NVRAM / or 0x2142 to start in quot;setup-modequot;) – check the startup-config file in NVRAM for boot-system commands – load IOS from Flash.

Question No: 90 – (Topic 3)

Refer to the exhibit.

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The technician wants to upload a new IOS in the router while keeping the existing IOS. What is the maximum size of an IOS file that could be loaded if the original IOS is also kept in flash?

  1. 3 MB

  2. 4 MB

  3. 5 MB

  4. 7 MB

  5. 8 MB

Answer: B Explanation:

In this example, there are a total of 8 MB, but 3.8 are being used already, so another file as large as 4MB can be loaded in addition to the original file.

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