[Free] 2017(July) EnsurePass Examcollection Cisco 200-125 Dumps with VCE and PDF 71-80

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 71 – (Topic 2)

What are three benefits of implementing VLANs? (Choose three.)

  1. A higher level of network security can be reached by separating sensitive data traffic from other network traffic.

  2. A more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure.

  3. A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.

  4. Broadcast storms can be mitigated by increasing the number of broadcast domains, thus reducing their size.

  5. Broadcast storms can be mitigated by decreasing the number of broadcast domains, thus increasing their size.

  6. VLANs make it easier for IT staff to configure new logical groups, because the VLANs all belong to the same broadcast domain.

  7. Port-based VLANs increase switch-port use efficiency, thanks to 802.1Q trunks.

    Answer: A,C,D Explanation:

    Benefits of VLANs

    VLAN is a network structure which allows users to communicate while in different locations by sharing one multicast domain and a single broadcast. They provide numerous networking benefits and have become popular in the market. For instance, it helps reduce administrative costs when users are geographically dispersed.

    1. Inexpensive

      The popularity of VLANs is due to the fact that changes, adds, and moves can be attained simply by making necessary configurations on the VLAN port. Time-consuming, re- addressing, and host reconfigurations is now a thing of the past, because network configuration can be made at ease when need arises.

    2. Better management

      A VLAN typically solve the scalability issues that exist in a large network by breaking the main domain into several VLAN groups or smaller broadcast configurations, thereby encourage better control of multicast traffic as well as broadcast domains.

    3. Improves network security

      High-security can be positioned in different VLAN groups to ensure that non-members cannot receive their broadcasts. On the other hand, a router is added and workgroups

      relocated into centralized locations.

    4. Enhances performance

      A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure.

    5. Segment multiple networks

      VLANs are typically used to achieve multiple purposes. They are popularly used to reduce broadcast traffic. Each VLAN creates a separate, smaller broadcast domain.

    6. Better administration

      VLANs facilitate grouping of multiple geographical stations. When VLAN users move to another physical location, the network does not have to be configured.

      Question No: 72 – (Topic 2)

      Refer to the exhibit.

      image

      How should the FastEthernet0/1 ports on the switches that are shown in the exhibit be configured to allow connectivity between all devices?

      1. The ports only need to be connected by a crossover cable.

      2. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode trunk

      3. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode access SwitchX(config-if)# switchport access vlan 1

      4. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode trunk SwitchX(config-if)# switchport trunk vlan 1 SwitchX(config-if)# switchport trunk vlan 10 SwitchX(config-if)# switchport trunk vlan 20

Answer: B Explanation:

IN order for multiple VLANs to cross switches, the connection between the switches must be a trunk. The 鈥渟witchport mode trunk鈥?command is all that is needed, the individual VLANs should not be listed over that trunk interface.

Question No: 73 – (Topic 2)

Refer to the exhibit.

image

A technician is troubleshooting host connectivity issues on the switches. The hosts in VLANs 10 and 15 on Sw11 are unable to communicate with hosts in the same VLANs on Sw12. Hosts in the Admin VLAN are able to communicate. The port-to-VLAN assignments are identical on the two switches. What could be the problem?

  1. The Fa0/1 port is not operational on one of the switches.

  2. The link connecting the switches has not been configured as a trunk.

  3. At least one port needs to be configured in VLAN 1 for VLANs 10 and 15 to be able to communicate.

  4. Port FastEthernet 0/1 needs to be configured as an access link on both switches.

  5. A router is required for hosts on SW11 in VLANs 10 and 15 to communicate with hosts in the same VLAN on Sw12.

Answer: B Explanation:

In order for hosts in the same VLAN to communicate with each other over multiple switches, those switches need to be configured as trunks on their connected interfaces so that they can pass traffic from multiple VLANs.

Question No: 74 – (Topic 2)

Assuming the default switch configuration, which VLAN range can be added, modified, and removed on a Cisco switch?

  1. 1 through 1001

  2. 2 through 1001

  3. 1 through 1002

  4. 2 through 1005

Answer: B Explanation: Explanation

VLAN 1 is the default VLAN on Cisco switch. It always exists and cannot be added, modified or removed.

VLANs 1002-1005 are default VLANs for FDDI amp; Token Ring and they can’t be deleted or used for Ethernet.

image

Question No: 75 – (Topic 2)

Which command can be used from a PC to verify the connectivity between hosts that connect through a switch in the same LAN?

  1. ping address

  2. tracert address

  3. traceroute address

  4. arp address

Answer: A Explanation:

ICMP pings are used to verify connectivity between two IP hosts. Traceroute is used to verify the router hop path traffic will take but in this case since the hosts are in the same LAN there will be no router hops involved.

Question No: 76 – (Topic 2)

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?

  1. path cost

  2. lowest port MAC address

  3. VTP revision number

  4. highest port priority number

  5. port priority number and MAC address

Answer: A Explanation:

The path cost to the root bridge is the most important value to determine which port will become the root port on each non-root switch. In particular, the port with lowest cost to the root bridge will become root port (on non-root switch).

Question No: 77 – (Topic 2)

Refer to the exhibit.

image

Given this output for SwitchC, what should the network administrator#39;s next action be?

  1. Check the trunk encapsulation mode for SwitchC#39;s fa0/1 port.

  2. Check the duplex mode for SwitchC#39;s fa0/1 port.

  3. Check the duplex mode for SwitchA#39;s fa0/2 port.

  4. Check the trunk encapsulation mode for SwitchA#39;s fa0/2 port.

Answer: C Explanation:

Here we can see that this port is configured for full duplex, so the next step would be to check the duplex setting of the port on the other switch. A mismatched trunk encapsulation would not result in input errors and CRC errors.

Question No: 78 – (Topic 2)

Which IEEE standard protocol is initiated as a result of successful DTP completion in a

switch over Fast Ethernet?

A. 802.3ad B. 802.1w C. 802.1D D. 802.1Q

Answer: D Explanation:

Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol for negotiating trunking on a link between two devices and for negotiating the type of trunking encapsulation (802.1Q) to be used.

Question No: 79 – (Topic 2)

Why will a switch never learn a broadcast address?

  1. Broadcasts only use network layer addressing.

  2. A broadcast frame is never forwarded by a switch.

  3. A broadcast address will never be the source address of a frame.

  4. Broadcast addresses use an incorrect format for the switching table.

  5. Broadcast frames are never sent to switches.

Answer: C Explanation:

Switches dynamically learn MAC addresses based on the source MAC addresses that it sees, and since a broadcast is never the source, it will never learn the broadcast address.

Question No: 80 – (Topic 2)

A network administrator creates a layer 3 EtherChannel, bundling four interfaces into channel group 1. On what interface is the IP address configured?

  1. the port-channel 1 interface

  2. the highest number member interface

  3. all member interfaces

  4. the lowest number member interface

Answer: A Explanation:

To create an EtherChannel interface and assign its IP address and subnet mask, use the following steps beginning in global configuration mode:

Command Purpose Step 1

Router(config)# interface port-channel channel-number

Router(config-if)#

Creates the EtherChannel interface. You can configure up to 16 FECs and 1 GEC on the Catalyst 2948G-L3 and up to 4 GECs on the Catalyst 4908G-L3.

Step 2

Router(config-if)# ip address ip-address subnet-mask

Assigns an IP address and subnet mask to the EtherChannel interface.

Step 3

Router(config-if)# exit

Router(config)#

Exits this mode. Optionally, you can remain in interface configuration mode and enable other supported interface commands to meet

The IP address is assigned to the port channel interface, not the underlying physical member interfaces.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2948gand4908g/12- 0_7_w5_15d/configuration/guide/config/ether_ch.html

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