[Free] 2017(July) EnsurePass Examcollection Cisco 200-125 Dumps with VCE and PDF 51-60

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2017 July Cisco Official New Released 200-125
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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 51 – (Topic 2)

At which layer of the OSI model is RSTP used to prevent loops?

  1. physical

  2. data link

  3. network

  4. transport

Answer: B Explanation:

RSTP and STP operate on switches and are based on the exchange of Bridge Protocol Data Units (BPDUs) between switches. One of the most important fields in BPDUs is the Bridge Priority in which the MAC address is used to elect the Root Bridge -gt; RSTP operates at Layer 2 鈥?Data Link layer -gt;.

Question No: 52 – (Topic 2)

What parameter can be different on ports within an EtherChannel?

  1. speed

  2. DTP negotiation settings

  3. trunk encapsulation

  4. duplex

Answer: B Explanation:

For an etherchannel to come up, the speed, duplex and the trunk encapsulation must be the same on each end.

Question No: 53 – (Topic 2)

Refer to the exhibit.

image

The output that is shown is generated at a switch. Which three statements are true? (Choose three.)

  1. All ports will be in a state of discarding, learning, or forwarding.

  2. Thirty VLANs have been configured on this switch.

  3. The bridge priority is lower than the default value for spanning tree.

  4. All interfaces that are shown are on shared media.

  5. All designated ports are in a forwarding state.

  6. This switch must be the root bridge for all VLANs on this switch.

Answer: A,C,E Explanation:

From the output, we see that all ports are in designated role (forwarding state).

The command 鈥渟how spanning-tree vlan 30 only shows us information about VLAN 30. We don’t know how many VLAN exists in this switch -gt;.

The bridge priority of this switch is 24606 which is lower than the default value bridge priority 32768.

All three interfaces on this switch have the connection type 鈥減2p鈥? which means Point-to- point environment 鈥?not a shared media.

The only thing we can specify is this switch is the root bridge for VLAN 3o but we cannot guarantee it is also the root bridge for other VLANs.

Question No: 54 – (Topic 2)

Refer to the exhibit.

image

Given the output shown from this Cisco Catalyst 2950, what is the reason that interface FastEthernet 0/10 is not the root port for VLAN 2?

  1. This switch has more than one interface connected to the root network segment in VLAN 2.

  2. This switch is running RSTP while the elected designated switch is running 802.1d Spanning Tree.

  3. This switch interface has a higher path cost to the root bridge than another in the topology.

  4. This switch has a lower bridge ID for VLAN 2 than the elected designated switch.

Answer: C Explanation:

Since the port is in the blocked status, we must assume that there is a shorter path to the root bridge elsewhere.

Question No: 55 – (Topic 2)

Refer to the exhibit.

image

Which WAN protocol is being used?

  1. ATM

  2. HDLC

  3. Frame Relay

  4. PPP

Answer: C Explanation:

This question is to examine the show int command.

According to the information provided in the exhibit, we can know that the data link protocol used in this network is the Frame Relay protocol.

鈥淟MI enq sent…鈥?/p>

Question No: 56 – (Topic 2)

Refer to the exhibit.

image

Why has this switch not been elected the root bridge for VLAN1?

  1. It has more than one interface that is connected to the root network segment.

  2. It is running RSTP while the elected root bridge is running 802.1d spanning tree.

  3. It has a higher MAC address than the elected root bridge.

  4. It has a higher bridge ID than the elected root bridge.

Answer: D Explanation:

The root bridge is determined by the lowest bridge ID, and this switch has a bridge ID priority of 32768, which is higher than the roots priority of 20481.

Question No: 57 – (Topic 2)

Which command enables RSTP on a switch?

  1. spanning-tree uplinkfast

  2. spanning-tree mode rapid-pvst

  3. spanning-tree backbonefast

  4. spanning-tree mode mst

Answer: B Explanation:

Rapid Spanning Tree Protocol (RSTP) is an enhancement of the original STP 802.1D protocol. The RSTP 802.1w protocol is an IEEE open implementation. Cisco has its own proprietary implementation of RSTP, that includes the benefits of its Per-VLAN spanning tree protocols, called Rapid-PVST .

To activate the Rapid-PVST protocol: switch(config)#spanning-tree mode rapid-pvst

Question No: 58 – (Topic 2)

Refer to the exhibit.

image

Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4. What will Switch-1 do with this data?

  1. Switch-1 will drop the data because it does not have an entry for that MAC address.

  2. Switch-1 will flood the data out all of its ports except the port from which the data originated.

  3. Switch-1 will send an ARP request out all its ports except the port from which the data originated.

  4. Switch-1 will forward the data to its default gateway.

Answer: B Explanation:

This question tests the operating principles of the Layer 2 switch. Check the MAC address table of Switch1 and find that the MAC address of the host does not exist in the table.

Switch1 will flood the data out all of its ports except the port from which the data originated to determine which port the host is located in.

Switches work as follows:

->Switches learn the MAC addresses of PCs or workstations that are connected to their switch ports by examining the source address of frames that are received on that port.

->Machines may have been removed from a port, turned off, or moved to another port on the same switch or a different switch.

->This could cause confusion in frame forwarding.

->The MAC address entry is automatically discarded or aged out after 300 seconds

->If there is not MAC address of destination host in MAC table, switch sends broadcast to all ports except the source to find out the destination host.

In output there is no MAC address of give host so switch floods to all ports except the source port.

Question No: 59 – (Topic 2)

What is one benefit of PVST ?

  1. PVST supports Layer 3 load balancing without loops.

  2. PVST reduces the CPU cycles for all the switches in the network.

  3. PVST allows the root switch location to be optimized per VLAN.

  4. PVST automatically selects the root bridge location, to provide optimized bandwidth usage.

Answer: C Explanation:

The PVST provides Layer 2 load-balancing for the VLAN on which it runs. You can create different logical topologies by using the VLANs on your network to ensure that all of your links are used but that no one link is oversubscribed. Each instance of PVST on a VLAN has a single root switch. This root switch propagates the spanning-tree information associated with that VLAN to all other switches in the network. Because each switch has the same information about the network, this process ensures that the network topology is maintained and optimized per VLAN.

Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2

_55_se/configuration/guide/swstp.html

Question No: 60 – (Topic 2)

Which three of these statements regarding 802.1Q trunking are correct? (Choose three.)

  1. 802.1Q native VLAN frames are untagged by default.

  2. 802.1Q trunking ports can also be secure ports.

  3. 802.1Q trunks can use 10 Mb/s Ethernet interfaces.

  4. 802.1Q trunks require full-duplex, point-to-point connectivity.

  5. 802.1Q trunks should have native VLANs that are the same at both ends.

Answer: A,C,E Explanation:

By default, 802.1Q trunk defined Native VLAN in order to forward unmarked frame. Switches can forward Layer 2 frame from Native VLAN on unmarked trunks port. Receiver switches will transmit all unmarked packets to Native VLAN. Native VLAN is the default VLAN configuration of port. Note for the 802.1Q trunk ports between two devices, the same Native VLAN configuration is required on both sides of the link. If the Native VLAN in 802.1Q trunk ports on same trunk link is properly configured, it could lead to layer 2 loops. The 802.1Q trunk link transmits VLAN information through Ethernet.

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