CCNA discovery 3 modul 3 exam answers versions 4.0

1

Refer to the exhibit. What two statements can be concluded from the information that is shown in the exhibit? (Choose two.)

• All ports that are listed in the exhibit are access ports. 
• ARP requests from Host1 will be forwarded to Host2. 
• Attaching Host1 to port 3 will automatically allow communication between both hosts. 
• The default gateway for each host must be changed to 192.168.3.250/28 to allow communication between both hosts. 
• A router connected to the switch is needed to forward traffic between the hosts. 

2
  

A router is configured to connect to a trunked uplink as shown in the exhibit. A packet is received on the FastEthernet 0/1 physical interface from VLAN 10. The packet destination address is 192.168.1.120. What will the router do with this packet? 

• The router will forward the packet out interface FastEthernet 0/1.1 tagged for VLAN 10. 
• The router will forward the packet out interface FastEthernet 0/1.2 tagged for VLAN 60. 
• The router will forward the packet out interface FastEthernet 0/1.3 tagged for VLAN 60. 
• The router will forward the packet out interface FastEthernet 0/1.3 tagged for VLAN 120. 
• The router will not process the packet since the source and destination are on the same subnet.  
• The router will drop the packet since no network that includes the source address is attached to the   router. 

3 The information contained in a BPDU is used for which two purposes? (Choose two.)

• to prevent loops by sharing bridging tables between connected switches 
• to set the duplex mode of a redundant link 
• to determine the shortest path to the root bridge 
• to determine which ports will forward frames as part of the spanning tree 
• to activate looped paths throughout the network 

4 A router has two serial interfaces and two Fast Ethernet interfaces. This router must be connected to a WAN link and to a switch that supports four VLANs. How can this be accomplished in the most efficient and cost-effective manner to support inter-VLAN routing between the four VLANs? 

• Connect a smaller router to the serial interface to handle the inter-VLAN traffic.
• Add two additional Fast Ethernet interfaces to the router to allow one VLAN per interface. 
•  Connect a trunked uplink from the switch to one Fast Ethernet interface on the router and create logical subinterfaces for each VLAN. 
• Use serial-to-Fast Ethernet transceivers to connect two of the VLANs to the serial ports on the router. Support the other two VLANs directly to the available FastEthernet ports. 

5 When are MAC addresses removed from the CAM table? 

• at regular 30 second intervals 
• when a broadcast packet is received 
• when the IP Address of a host is changed 
• after they have been idle for a certain period of time

6
   

 

Refer to the exhibit. Switch1 is not participating in the VTP management process with the other switches. Which two are possible reasons for this? (Choose two.)

• Switch2 is in transparent mode. 
• Switch1 is in client mode. 
• Switch1 is using VTP version 1 and Switch2 is using VTP version 2. 
• Switch2 is in server mode. 
• Switch1 is in a different management domain. 
• Switch1 has no VLANs. 

7 Which three must be used when a router interface is configured for VLAN trunking? (Choose three.)

• one subinterface per VLAN 
• one physical interface for each subinterface 
• one IP network or subnetwork for each subinterface 
• one trunked link per VLAN 
• a management domain for each subinterface 
• a compatible trunking protocol encapsulation for each subinterface 

8
  

Refer to the exhibit. The switches are connected with trunks within the same VTP management domain. Each switch is labeled with its VTP mode. A new VLAN is added to Switch3. This VLAN does not show up on the other switches. What is the reason for this?

• VLANs cannot be created on transparent mode switches. 
• Server mode switches neither listen to nor forward VTP messages from transparent mode switches. 
• VLANs created on transparent mode switches are not included in VTP advertisements. 
• There are no ports assigned to the new VLAN on the other switches. 
•  Transparent mode switches do not forward VTP advertisements. 

9 Which two criteria are used by STP to select a root bridge? (Choose two.)

• memory size 
• bridge priority 
• switching speed 
• number of ports 
• base MAC address 
• switch location 

10 Which three steps should be taken before moving a Catalyst switch to a new VTP management domain? (Choose three.)

• Reboot the switch. 
• Reset the VTP counters to allow the switch to synchronize with the other switches in the domain. 
• Download the VTP database from the VTP server in the new domain. 
• Configure the VTP server in the domain to recognize the BID of the new switch. 
• Select the correct VTP mode and version. 
• Configure the switch with the name of the new management domain. 

11 Which two items will prevent broadcasts from being sent throughout the network? (Choose two.)

• bridges 
• routers 
• switches 
• VLANs 
• hubs 

12 Which two characteristics describe a port in the STP blocking state? (Choose two.)

• provides port security 
• displays a steady green light 
• learns MAC addresses as BPDUs are processed 
• discards data frames received from the attached segment 
• receives BPDUs and directs them to the system module 

13 What is the first step in the process of convergence in a spanning tree topology?

• election of the root bridge 
• determination of the designated port for each segment 
• blocking of the non-designated ports 
• selection of the designated trunk port 
• activation of the root port for each segment 

14 In which STP state does a switch port transmit user data and learn MAC addresses?

• blocking 
• learning 
• disabling 
• listening 
• forwarding 

15 What is the purpose of VTP?

• maintaining consistency in VLAN configuration across the network 
• routing frames from one VLAN to another 
• routing the frames along the best path between switches 
• tagging user data frames with VLAN membership information 
• distributing BPDUs to maintain loop-free switched paths 

16 Which statement best describes adaptive cut-through switching?

• The switch initially forwards all traffic using cut-through switching and then changes to store-and-forward switching if errors exceed a threshold value. 
• The switch initially forwards all traffic using cut-through switching and then changes to fast-forward switching if errors exceed a threshold value. 
• The switch initially forwards all traffic using cut-through switching and then temporarily disables the port if errors exceed a threshold value. 
• The switch initially forwards all traffic using store-and-forward switching and then changes to cut-through switching if errors exceed a threshold value. 

17 Using STP, how long does it take for a switch port to go from the blocking state to the forwarding state?

• 2 seconds 
• 15 seconds 
• 20 seconds 
• 50 seconds

18

Refer to the exhibit. The switches are interconnected by trunked links and are configured for VTP as shown. A new VLAN is added to Switch1. Which three actions will occur? (Choose three.)

• Switch1 will not add the VLAN to its database and will pass the update to Switch 2. 
• Switch2 will add the VLAN to its database and pass the update to Switch3. 
• Switch3 will pass the VTP update to Switch4. 
• Switch3 will add the VLAN to its database. 
• Switch4 will add the VLAN to its database. 
• Switch4 will not receive the update. 

19 Which Catalyst feature causes a switch port to enter the spanning-tree forwarding state immediately?

• backbonefast 
• uplinkfast 
• portfast 
• rapid spanning tree 

20
  
Refer to the exhibit. Which set of commands would be used on the router to provide communication between the two hosts connected to the switch? 

•  Router(config)# interface vlan 2 

     Router(config-if)# ip address 192.168.2.1 255.255.255.0
     Router(config-if)# no shutdown
     Router(config)# interface vlan 3
     Router(config-if)# ip address 192.168.3.1 255.255.255.0
     Router(config-if)# no shutdown

•  Router(config)# interface fastethernet 0/0 

     Router(config-if)# no shutdown
     Router(config-if)# interface fastethernet 0/0.2
     Router(config-subif)# encapsulation dot1q 2
     Router(config-subif)# ip address 192.168.2.1 255.255.255.0
     Router(config-if)# interface fastethernet 0/0.3
     Router(config-subif)# encapsulation dot1q 3
     Router(config-subif)# ip address 192.168.3.1 255.255.255.0 

•  Router(config)# interface vlan 2 

     Router(config-if)# switchport mode trunk dot1q
     Router(config)# interface vlan 3
     Router(config-if)# switchport mode trunk dot1q

•  Router(config)# interface fastethernet 0/0 

     Router(config-if)# mode trunk dot1q 2 3
     Router(config-if)# ip address 192.168.2.1 255.255.255.0