CCNA Switching

CCNA Switching - 45 Questions

Question 1

Which three statements accurately describe Layer 2 Ethernet switches? (Choose three)

A) Microsegmentation decreases the number of collision on the network.

B) If a switch receives a frame for an unknown destination, it uses ARP to resolve the address.

C) Spanning Tree Protocol allows switches to automatically share VLAN information.

D) In a properly functioning network with redundant swithed paths, each switched segment will contain one root bridge with all its pots in the forwarding state. All other switches in that broadcast domain will have only one root port.

E) Establishing VLAN's increases the number of broadcast domains.

F) Switches that are configured with VLAN's make forwarding decissions based on both Layer 2 and Layer 3 address information.

Question 2

Based on the information given, which switch will be elected root bridge and why?

A) Switch A, because it has the lowest MAC address.

B) Switch A, because it is the most centrally located switch.

C) Switch B, because it has the highest MAC address.

D) Switch C, because it is the most centrally located switch.

E) Switch C, because it has the lowest priority.

F) Switch D, because it has the highest priority.

Question 3

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

A) port priority number and MAC address.

B) lowest port MAC address.

C) path cost.

D) VTP revission number.

E) highest port priority number.

Question 4

Refer to the exhibit.
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? (Choose two)

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

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

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

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

Question 5

Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network ? (Choose two)

A) 802.1d

B) VTP

C) 802.1q

D) STP

E) SAP

Question 6

Which switch would STP choose to become the root bridge in the selection process?

A) 32768:11-22-33-44-55-66

B) 32768:22-33-44-55-66-77

C) 32769:11-22-33-44-55-65

D) 32769:22-33-44-55-66-78

Question 7

A technician has installed SwitchB and needs to configure it for remote access from the management workstation connected to SwitchA?
Which set of commands is required to accomplish this task?

A) SwitchB(config)#ip default-gateway 192.168.8.254
SwitchB(config)#interface vlan 1
SwitchB(config)#ip address 192.168.8.252 255.255.255.0
SwitchB(config)#no shutdown

B) SwitchB(config)#ip default-network 192.168.8.254
SwitchB(config)#interface vlan 1
SwitchB(config)#ip address 192.168.8.252 255.255.255.0
SwitchB(config)#no shutdown

C) SwitchB(config)#interface vlan 1
SwitchB(config)#ip address 192.168.8.252 255.255.255.0
SwitchB(config)#ip default-gateway 192.168.8.254 255.255.255.0
SwitchB(config)#no shutdown

D) SwitchB(config)#ip router 192.168.8.254 255.255.255.0
SwitchB(config)#interface FastEthernet0/1
SwitchB(config)#ip default-gateway 192.168.8.254 255.255.255.0
SwitchB(config)#no shutdown

E) SwitchB(config)#interface FastEthernet0/1
SwitchB(config)#ip default-gateway 192.168.8.252 255.255.255.0
SwitchB(config)#no shutdown

Question 8

Which two states are the port states when RSTP has converged ? (Choose two)

A) blocking

B) learning

C) disabled.

D) forwarding

E) listening

Question 9

Which command enables RSTP on a switch?

A) spanning tree backbonefast

B) spanning-tree mode rapid-pvst

C) spanning-tree mode mst

D) spanning-tree uplinkfast

Question 10

Refer to the exhibit.
Given the output shown from the Cisco Catalyst 2950, what is the most likely reason that interface FastEthernet0/10 is not the the root port for VLAN 2?

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

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

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

D) This switch has a lower bridge ID for VLAN 2 than elected designated switch.

Question 11

Why will a switch never learn a broadcast address?

A) Broadcast frames are never sent to switches.

B) Broadcast addresses use an incorrect format for the switching table.

C) Broadcast address will never be the source address of a frame.

D) Broadcasts only use network layer addressing.

E) A broadcast frame is never forwarded by a switch.

Question 12

A) it has more than one interface that is connected to the root network segment.

B) it is running RSTP while the elected root bridge is running 802.1d spanning tree.

C) it has a higher MAC address than the elected root bridge.

D) it has a higher bridge ID than the elected root bridge.

Question 13

Which three statements about RSTP are true? (Choose three)

A) RSTP port states are blocking, discarding, learning or forwarding.

B) RSTP expands the STP port roles by adding the alternative and backup roles.

C) RSTP significantly reduces topology reconverging time after a link failure.

D) RSTP also uses the STP proposal-agreement sequence.

E) RSTP uses the same timer-based process as STP on point to point links.

F) RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

Question 14

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

A) data link

B) network

C) physical

D) transport

Question 15

What does a Layer 2 switch use to decide where to forward a received frame?

A) source MAC address

B) source IP address

C) source switch port

D) desitnation IP address

E) destination port address

F) destination MAC address.

Question 16

Based on the network shown in the graphic, which option contains both the potention networking problem and the protocol or setting that should be used to prevent the problem?

A) routing loops, hold down timers.

B) switching loops, split horizon.

C) routing loops, split horizon.

D) switching loops, VTP.

E) routing loops, STP

F) switching loops, STP

Question 17

Which two of these are characteristics of the 802.1Q protocol? (Choose two)

A) it modifies the 802.3 frame header, and thus requires that the FCS be recomputed.

B) it is used exclusively for tagging VLAN frames and does not address network reconvergence following switched network topology changes.

C) it is a layer 2 messaging protocol which maintains VLAN configurations across networks.

D) it is a trunking protocol capable of carrying untagged frames.

E) it includes an 8-bit field which specifies the priority of a frame.

Question 18

Refer to the exhibit.
Each of these four switches has been configured with a hostname, as well as being configured to run RSTP. No other configuration changes have been made.Which three of these show the correct RSTP port roles for the indicated switches and interfaces? (Choose three)

A) SwitchA, Fa0/2, designated

B) SwitchA, Fa0/1, root

C) SwitchB, Gi0/2, root

D) SwitchB, Gi0/1, designated

E) SwitchC, Fa0/2, root

F) SwitchD, Gi0/2, root

Question 19

Refer to the exhibit.
Which switch provides the spanning-tree designated port role for the network segment that services the printers?

A) Switch 1

B) Switch 2

C) Switch 3

D) Switch 4

Question 20

What is one benefit of PVST+?

A) PVST+ reduces the CPU cycles for all the switches in the network.

B) PVST+ automatically selects the root bridge location, to provide optimize.

C) PVST+ allows the root switch location to be optimized per VLAN.

D) PVST+ supports Layer 3 load balancing without loops.

Question 21

Refer to the exhibit.At the end of an RSTP election process, which access layer switch port will assume the discarding role?

A) Switch3, port fa0/1

B) switch3, port fa0/12

C) switch4, port fa0/11

D) switch4, port fa0/2

E) switch3, port Gi0/1

F) switch3, port Gi0/2

Question 22

Which term describes a spanning-tree network that has all switch ports in either the blocking or forwarding state?.

A) spanned.

B) converged.

C) provisioned.

D) redundant

Question 23

Which two of these statements regarding RSTP are correct? (Choose two)

A) RSTP cannot operate with PVST+

B) RSTP defines new port roles.

C) RSTP defines no new port states.

D) RSTP is a proprietary implementation of IEEE 802.1D STP

E) RSTP is compatible with 802.1D STP

Question 24

Refer to the exhibit, Which two statements are true of the interfaces on Switch1? (Choose two)

A) Interface FastEther0/2 has been disabled

B) Multiple devices are connected directly to FastEthernet0/1

C) FastEthernet0/1 is configured as a trunk link.

D) FastEthernet0/1 is connected to a host with multiple network interface cards.

E) FastEthernet0/5 has statically assigned MAC addresses.

F) A hub is connected directly to FastEthernet0/5.

Question 25

Three switches are connected to one another via trunk ports.
Assuming the default switch configuration, which switch is elected as the root bridge for the spanning-tree instance of VLAN 1?

A) the switch with the highest MAC address.

B) the switch with the lowest IP address.

C) the switch with the lowest MAC address.

D) the switch with the highest IP address.

Question 26

Which two commands correctly verify whether port security has been configured on port FastEthernet0/12 on a switch? (Choose two)

A) sw1# show switchport port-secure interface FastEthernet 0/12

B) sw1# show switchport port-security interface FastEthernet 0/12

C) sw1# show port-secure interface FastEthernet 0/12

D) sw1# show running-config

E) sw1# show port-security interface FastEthernet 0/12

Question 27

What two functions will occur when this frame is received by 2950Swtich? (Choose two)

A) The MAC address table will now have an additional entry of fa0/1 FFFF.FFFF.FFFF

B) Only host A will be allowed to transmit frames on fa0/1.

C) This frame will be discarded when it is received by 2950Switch.

D) All frames arriving on 2950Switch with a destination of 0000.00aa.aaaa will be forwarded out fa0/1.

E) Host B and C may forward frame out fa0/1 but frames arriving from other switches will not be forwarded out fa0/1.

F) only frame from srouce 0000.00bb.bbbb, the first learned MAC address of 2950Switch, will be forwarded out fa0/1.

Question 28

The network administrator cannot connect to Switch1 over a Telnet session, although the hosts attached to Switch1 can ping the interface Fa0/0 of the router.
Given the information in the graphic and assuming that the router and Switch2 care configured properly, which of the following command should be issued on Switch1 to correct this problem?

A) Switch1(config)# interface fa0/1
Switch1(config-if)# ip address 192.168.24.3 255.255.255.0

B) Switch1(config)# interface fa0/1
Switch1(config-if)# switchport mode trunk

C) Switch1(config)# interface fa0/1
Switch1(config-if)# duplex full
Switch1(config-if)# speed 100

D) Switch1(config)# ip default-gateway 192.168.24.1

E) Switch1(config)# line con0
Switch1(config-line)# password cisco
Switch1(config-line)# login

Question 29

Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?

A) Backbone Fast

B) UplinkFast

C) Root Guard

D) BPDU Guard

E) BPDU Filter

Question 30

In which circumstances are multiple copies of the same unicast frame likely to be transmitted in a switched LAN ?

A) after broken links are re-established.

B) in an improperly implemented redundant toplogy.

C) when upper-layer protocols require high reliability.

D) during high traffic periods.

E) When a dual ring topology is in use.

Question 31

Which port state is introduced by Rapid-PVST?

A) learning

B) listening

C) discarding

D) forwarding

Question 32

Refer to the exhibit.
The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three)

A) Ensure that the Ethernet encapsulations match on the interconnected router and switch ports.

B) Ensure that cables A and B are straight-through cables.

C) Ensure cable A is plugged into a trunk port.

D) Ensure the switch has power.

E) Reboot all of the devices.

F) Reseat all cables.

Question 33

Refer to the exhibit. A junior network administrator was given the task of configuring port security on SwitchA to allow only PC_A to access the switched network through port fa0/1. if any other device is detected, the port is to drop frames from this device. The administrator configured the interface and tested it with successfule pings from PC_A to RouterA, and then observes the output from these two show commands.

Which two of these changes are necessary for SwitchA to meet the requirements? (Choose two)

A) Configure port security to shut down the interface in the event of a voilation.

B) Port security needs to be enabled on the interface.

C) Enable port security globally.

D) Port security needs to be configured to allow only one learned MAC address.

E) Port security interface counters need to be cleared before using the show command.

F) The port security configuration needs to be saved to NVRAM before it can become active.

Question 34

Which set of commands is recommended to prevent the use of a hub in the access layer?

A) switch(config-if)# switchport mode trunk
switch(config-if)# switchport port-security maximum 1

B) switch(config-if)# switchport mode trunk
switch(config-if)# switchport port-security mac-address 1

C) switch(config-if)# switchport mode access
switch(config-if)# switchport port-security maximum 1

D) switch(config-if)# switchport mode access
switch(config-if)# switchport port-security mac-address 1

Question 35

A network administrator needs to configure port security on a switch. Which two statements are true? (Choose two).

A) The network administrator can apply port security to dynamic access ports.

B) The network adminsitrator can apply port security to EtherChannels.

C) When dynamic MAC address learning is enabled on an interface, the switch can learn new addresses, up to the maximum defined.

D) The sticky learning feature allows the addition of dynamic learned addresses to the running confguration.

E) The network administrator can configure static secure or sticky secure MAC addresses in the voice VLAN.

Question 36

On a corporate network, hosts on the same VLAN can communicate with each other, but they are unable to communicate with hosts on different VLAN's. What is needed to allow communication between the VLAN's?

A) a router with subinterfaces configured on the physical interface that is connected to the switch.

B) a router with an IP address on the physical interface connected to the switch.

C) a switch with an access link that is configured between the switches.

D) a switch with a trunk link that is configured between the switches.

Question 37

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

A) transparent

B) auto

C) on

D) desirable

E) blocking

F) forwarding

Question 38

A network administrator is explaining VTP configuration to a new technician. What should the network administrator tell the new technician about VTP configuration? (Choose three)

A) A switch in the VTP client mode cannot update its local VLAN database.

B) A trunk list must be configured between the switches to forward VTP updates.

C) A switch in the VTP server mode can update a switch in the VTP transparent mode.

D) A switch in the VTP transparent mode will forward updates that it receives to other switches.

E) A switch in the VTP server mode only updates switches in the VTP client mode that have a higher VTP revision number.

F) A switch in the VTP server mode will update switches in the VTP client mode regardless of the configured VTP domain membership.

Question 39

A company is installing IP phones. The phones and office computers connect to the same device.To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic.What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? (Choose two)

A) hub.

B) router

C) switch

D) STP

E) Subinterfaces

F) VLAN

Question 40

What are two advantages of Layer 2 Ehternet switches over hubs? (Choose two)

A) decreasing the number of collision domains.

B) filtering frames based on MAC addresses.

C) allowing simultaneous frame transmissions.

D) increasing the size of broadcast domains.

E) increasing the maximum length of UTP cabling between devices.

Question 41

Refer to the exhibit. A network associate needs to configure the switches and router in the graphic so that the hosts in VLAN3 and VLAN4 can communicate with the enterprise server in VLAN2. Which two Ethernet segments would need to be configured as trunk links? (Choose two).

A) A

B) B

C) C

D) D

E) E

F) F

Question 42

Switch ports operating in which two roles will forward traffic according to the IEEE802.1w standard? (Choose two).

A) alternate

B) backup

C) designated

D) disabled.

E) root

Question 43

All switch ports are assigned to the correct VLAN's, 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?

A) The access link needs to be configured in multiple VLAN's.

B) The link between the switches is configured in the wrong VLAN.

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

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

E) Switch IP address must be configured in order for traffic to be forwarded between the switches.

Question 44

What will be the result if the following configuration commands are implemented on a Cisco switch?
Switch(config-if)# switchport port-security
Switch(config-if)# switchport port-security mac-address sticky

A) A dynamically learned MAC address is saved in the startup-configuration file.

B) A dynamically learned MAC address is saved in the running-configuration file.

C) A dynamically learned MAC address is saved in the VLAN database.

D) Statically configured MAC addresses are saved in the startup-configuration file if frames from that address are received.

E) Statically configured MAC addresses are saved in the running-configuration file if frames from that address are received.

Question 45

Which command enhances the 802.1D convergence time on ports that are connected to hosts?

A) spanning-tree backbonefast

B) spanning-tree uplinkfast

C) spanning-tree portfast

D) spanning-tree cost512