CCNA Exploration 3: LAN Switching and Wireless– Final exam (90% common) update

1. 

Refer to the exhibit. A network administrator needs to add IP phones to the network. To which devices should the IP phones connect?

• AS1 and AS2
• DS1 and DS2
• DS1, DS2, and CS1
• AS1, AS2, DS1, and DS2

2. Which CLI mode allows users to access all device commands, such as those used for configuration, management, and troubleshooting?

• user EXEC mode
• privileged EXEC mode
• global configuration mode
• interface configuration mode

3. 

Refer to the exhibit. All hosts are in listen mode. Host 1 and Host 4 both transmit data at the same time. How do the hosts respond on the network? (Choose two.)

• After the end of the jam signal, a backoff algorithm is invoked.
• Hosts 1 and 4 are operating full duplex so no collision will exist.
• The hub will block the port connected to Host 4 to prevent a collision.
• Hosts 1 and 4 are assigned shorter backoff values to provide them priority to access the media.
• If a host has data to transmit after the backoff period of that host, the host checks to determine if the line is idle before transmitting.

4. 

 Refer to the exhibit. An administrator documented the output of a CAM table from an Ethernet switch as shown. What action will the switch take when it receives the frame shown at the bottom of the exhibit?

• discard the frame
• forward the frame out port 2
• forward the frame out port 3
• forward the frame out all ports
• forward the frame out all ports except port 3
• add station 00-00-3D-1F-11-05 to port 2 in the forwarding table

5. What two methods can be used to remove MAC address table entries from a switch? (Choose two.)

• Power cycle the switch to clear all dynamically learned addresses.
• The clear switching-tables command will remove statically configured entries.
• The clear mac-address-table command will remove statically and dynamically configured table entries.
• The erase flash command will clear all statically configured table entries.
• Statically configured MAC addresses will automatically be removed from the address table 300 minutes after the last activity on a switch port.

6. Which three statements are correct concerning the default configuration of a new switch? (Choose three.)

• It is configured in VTP server mode.
• STP is automatically enabled.
• The first VTY line is automatically configured to allow remote connections.
• VLAN1 is configured with a management IP address.
• All switch ports are assigned to VLAN1.
• The enable password is configured as cisco.

7. What will be the effect of the command S1# copy system:running-config tftp://172.16.2.155/tokyo-config?

• The IOS will be copied to the TFTP server.
• The configuration file named tokyo-config will overwrite the startup configuration file on S1.
• The running configuration file on S1 will be saved via TFTP to a file named tokyo-config.
• The contents of NVRAM on S1 will become the startup configuration file on the tokyo switch.

8. 

 Refer to the exhibit. What does the term DYNAMIC indicate in the output that is shown?

• This entry can only be removed from the MAC address table by a network administrator.
• When forwarding a frame to the device with address 0060.5c5b.cd23, the switch does not have to perform a lookup to determine the final destination port.
• Only the device with MAC address 0060.5c5b.cd23 will be allowed to connect to port Fa0/18.
• The switch learned this MAC address from the source address in a frame received on Fa0/18.

9. Company policy requires disabling the command history buffer on network devices. An administrator enters terminal no history size at the command prompt on a Cisco Catalyst switch and receives no error messages back, but the command history buffer is still available. What is the problem?

• The command contained a syntax error.
• The Cisco IOS version does not support disabling the command history buffer.
• The command history can only be disabled on a router, not a switch.
• The size parameter reset the default buffer size but did not disable access to the buffer.

10. 

 Refer to the exhibit. The devices in the network are operational and configured as indicated in the exhibit. However, hosts B and D cannot ping each other. What is the most likely cause of this problem?

• The link between the switches is up but not trunked.
• The Fa0/11 interface of Switch1 is not configured as a trunk.
• Hosts B and D are configured with IP addresses from different subnets.
• VLAN 20 and VLAN 30 are not allowed on the trunk between the switches.

11. A network administrator is implementing VTP in a large campus LAN that contains one hundred switches. What are valid considerations for reliability and administration?

• Using server mode on a single master switch and client mode on all other switches will provide the most fault tolerance for retaining VLAN information in all switches if power is lost on the network.
• Using transparent mode on all switches will allow for efficient administration and prevent VLAN data loss from the loss of any single switch.
• Configuring several switches in server mode will allow all VLANs to be entered from a single switch and preserve VLAN data if any of the switches or connections are lost.
• Configuring one primary and one backup switch in server mode and all other switches in transparent mode will provide fault tolerance for the VLAN data and allow for efficient distribution of the VLAN configurations to all switches.

12. 

Refer to the exhibit. Switch SW-A is to be used as a temporary replacement for another switch in the VTP Student domain. What two pieces of information are indicated from the exhibited output? (Choose two.)

• The other switches in the domain can be running either VTP version 1 or 2.
• There is a risk that the switch may cause incorrect VLAN information to be sent through the domain.
• VTP will block frame forwarding on at least one redundant trunk port that is configured on this switch.
• VLAN configuration changes made on this switch will be sent to other devices in the VTP domain.
• This switch will update its VLAN configuration when VLAN changes are made on a VTP server in the same domain.

13. What is the purpose of issuing the command switchport mode access on a switch interface?

• disable port security
• make the port operational
• override the default port behavior
• force the port to be a part of a single vlan

14. 

Refer to the exhibit. What happens when a frame from a source MAC address different from 00a8.d2e4.ba27 reaches switch port 0/5?

• The frame is dropped.
• The port is shut down.
• An error message is displayed.
• FastEthernet port 0/5 will show an err-disabled message.

15. 

Refer to the exhibit. What will be the result of the commands that are shown in the exhibit?

• Only clients on VLAN 2 will be able to use DHCP for addressing.
• DHCP server responses will only be permitted on interface Fa0/2.
• Only 100 clients are permitted to request DHCP addresses on VLAN 2.
• Client requests for DHCP addresses will be filtered out if the requests are not received on interface Fa0/2.

16. Why is it important that the network administrator consider the spanning-tree network diameter when choosing the root bridge?

• The network diameter limitation is 9.
• BPDUs may be discarded because of expiring timers.
• The cabling distance between the switches is 100 meters.
• The network diameter must be set to the number of meters of the cable between the root bridge and its farthest connected switch.

17. What is the purpose of the Spanning Tree algorithm?

• It propagates VLAN configurations to other switches.
• It restricts broadcast packets to a single VLAN.
• It segments a network into multiple broadcast domains.
• It prevents loops in a switched network with redundant paths.

18. 

Refer to the exhibit. What is the result of issuing these commands?

• The enable password will be set.
• The password will be set for the first Telnet connection.
• The password will be set for the console connection.
• The password will be set for the auxiliary connection.

19. 

Refer to the exhibit. Each switch is shown with its MAC address. Which switch will be elected as the spanning-tree root bridge if the switches are configured with their default priority values?

• switch A
• switch B
• switch C
• switch D
• switch E
• switch F

20. 

Refer to the exhibit. All edge ports are configured with the spanning-tree portfast command. Host1 is recently connected to port Fa0/1 on switch SW1 . Which statement is true about the status of port Fa0/1?

• The port will transition into blocking state.
• The port will transition immediately into forwarding state.
• The port will transition into blocking state and then immediately into forwarding state.
• The port will transition into blocking state and immediately transition through the listening and learning states.

21. Which statement is correct about STP architecture?

• Spanning Tree Protocol will guarantee a loop free Layer 2 topology.
• Spanning Tree Protocol guarantees the shortest path to destination networks.
• The switch with the highest priority will be assigned the lowest BID in the root election.
• The first step in the spanning-tree election process is to determine the root port.
• To select designated ports, the spanning-tree algorithm must determine the longest contiguous path from the root bridge.

22. 

Refer to the exhibit. All switches are configured with the default bridge priority. Which port will act as a non-designated port if all links are operating at the same bandwidth?

• Fa0/1 interface of switch A
• Fa0/2 interface of switch A
• Fa0/1 interface of switch B
• Fa0/2 interface of switch B
• Fa0/1 interface of switch C
• Fa0/2 interface of switch C

23. 

Refer to the exhibit. Which Spanning Tree Protocol version is in effect?

• Per VLAN Spanning Tree (PVST)
• Per VLAN Spanning Tree + (PVST+)
• Common Spanning Tree (CST)
• Rapid Spanning Tree Protocol (RSTP)
• Multiple Spanning Tree Protocol (MSTP)

24. 

 Refer to the exhibit. Each switch is configured to participate in STP for VLANs 1, 10, 20, and 30. Which switch will become the root for VLAN 20?

• A
• B
• C
• D

25. 

Refer to the exhibit. R1 is configured for traditional inter-VLAN routing. R1 can ping computer 3 but cannot ping computer 1. What is a possible cause for this failure?

• S1 port Fa0/11 is in the wrong VLAN.
• R1 does not have an active routing protocol.
• The IP address of computer 1 is in the wrong logical network.
• Router interface Fa0/0 has the wrong trunk encapsulation type configured.

26. What is an efficient and cost effective way to minimize the frequency and effects of broadcast storms on an Ethernet LAN?

• Connect each PC directly to a router port.
• Use access control lists to filter broadcasts from the network.
• Divide the computers into separate VLANs on the existing switches.
• Divide the computers into separate workgroups using different physical switches.

27. 

Refer to the exhibit. What would happen if the network administrator moved the network cable of Host A from interface Fa0/1 to Fa0/3 on switch SW1?

• Host A remains a member of VLAN 10, because the router is routing traffic between VLANs.
• Host A is no longer a member of VLAN 10, because port Fa0/3 has been manually assigned to VLAN 30.
• Host A remains a member of VLAN 10, because the switch provides dynamic VLAN assignment for the port.
• Host A maintains connectivity to all members of VLAN 10, because it is connected to the same physical network.
• Host A is no longer a member of VLAN 10, but because port Fa0/3 was unused, it is now a member of VLAN 1.

28. 

 Refer to the exhibit. What is the maximum number of VLANs that can be deleted from the Switch as it is configured?

• zero
• four
• five
• eight
• nine

29. 

 Refer to the exhibit. Router R1 is properly configured for router on a stick inter-VLAN routing, but PC1 is unable to ping PC2. What needs to be done to resolve the problem?

• Rename VLAN1.
• Connect one more port of S1 to R1.
• Configure the Fa0/1 port of S1 as a trunk port.
• Move the Fa0/0 interface of R1 to another VLAN.

30. 

 Refer to the exhibit. A network administrator has segmented the network into two VLANs and configured Router1 for inter-VLAN routing. A test of the network, however, shows that hosts on each VLAN can only access local resources and not resources on the other VLAN. What is the most likely cause of this problem?

• Switch port Fa0/1 is not trunking.
• Router interface Fa0/0 is possibly down.
• No routing protocol is configured on Router1.
• One of the router subinterfaces is possibly down.

31. 

 Refer to the exhibit. Hosts that are connected to switch SW1 are not able to communicate with hosts in the same VLAN that are connected to switch SW2. What should be done to fix the problem?

• Introduce a Layer 3 device in the topology.
• Configure both switches in VTP transparent mode to allow them to share VLAN information.
• Reconfigure the fa0/1 interface on switch SW1 with a static trunk configuration.
• Apply IP addresses that are in the same subnet to FastEthernet 0/1 on SW1 and FastEthernet 0/2 on SW2.

32. What is the purpose of VLAN trunking?

• It improves network performance by reducing broadcast traffic.
• It selects the best path to transmit data in a switched network.
• It carries the traffic of multiple VLANs through a single link.
• It avoids spanning tree loops in a switched network.

33. 

 Refer to the exhibit. Router R-West and switch S-West1 are connected via a single ethernet cable between the router interface fa0/0 and the switch interface fa0/1. The router and switch have been configured with the commands that are displayed in the exhibit. The network administrator enters the show interfaces trunk command and receives the output as shown. What is the cause of the “not-trunking” status for switch port Fa0/1?

• The trunk is established, but no VLANs have been configured to use it.
• The router is missing the dynamic trunking protocol statements necessary to form a trunk.
• Because the router does not support Dynamic Trunking Protocol, the trunk has not been established.
• The router, the switch, or both must be configured with the dynamic desirable option for Dynamic Trunking Protocol to establish a trunk.

34. 

 Refer to the exhibit. Both switches are interconnected via a trunk link. Host A and host B are on the default VLAN but are not able to exchange traffic. What should be done to fix the problem?

• Allow all VLANs on the trunk link.
• Remove the native VLAN from the trunk.
• Include a router or switch with Layer 3 capabilities.
• Configure the same native VLAN on both ends of the trunk.

35. 

 Refer to the exhibit. If switch SW1 is configured with the four VLANs as shown in the exhibit, how many physical interfaces are needed on router R1 to configure inter-VLAN routing using subinterfaces?

• zero
• one
• two
• four

36. 

 Refer to the exhibit. A new host needs to be connected to VLAN 3. Which IP address should be assigned to this new host?

• 192.168.1.22 /28
• 192.168.1.31 /28
• 192.168.1.32 /28
• 192.168.1.52 /28
• 192.168.1.63 /28

37. 

 Refer to the exhibit. Which three options correctly describe the router configuration that is shown? (Choose three.)

• An IEEE standard trunking protocol is in use.
• Interface Fa0/1 has been configured with subinterfaces.
• The shutdown command has been applied to interface Fa0/1.
• Interface Fa0/1.3 is mapped to the default management VLAN.
• The configuration is appropriate for a router-on-a-stick network design.
• An IP address should be applied to interface Fa0/1 for routing to occur.

38. 

 Refer to the exhibit. Router RA receives a packet with a source address of 192.168.1.65 and a destination address of 192.168.1.161. What will the router do with this packet?

• The router will drop the packet.
• The router will forward the packet out interface FastEthernet 0/1.1.
• The router will forward the packet out interface FastEthernet 0/1.2.
• The router will forward the packet out interface FastEthernet 0/1.3.
• The router will forward the packet out interface FastEthernet 0/1.2 and interface FastEthernet 0/1.3.

39. 

 Refer to the exhibit. Which two statements are true about the operation of the interfaces? (Choose two.)

• Incoming traffic with VLAN ID 0 is processed by interface fa0/0.
• Incoming traffic that has a VLAN ID of 2 is processed by subinterface fa0/0.2.
• Both subinterfaces remain up with line protocol up, even if fa0/0 line protocol is down.
• Subinterfaces use unique MAC addresses by adding the 802.1Q VLAN ID to the hardware address.
• Traffic inbound on this router is processed by different subinterfaces, depending on the VLAN from which the traffic originated.

40. In which mode is a VTP switch operating if it has been configured to only forward VTP advertisements?

• client
• root
• server
• transparent

41. 

 Refer to the exhibit. Switches S2 and S3 are properly connected using an ethernet cable. A network administrator has configured both switches with VTP, but S3 is unable to propagate VLANs to S2. What could be the reason for this?

• The VTP configuration revision is different on both switches.
• The VTP domains are different on both switches.
• VTP pruning is disabled.
• VTP v2 is disabled.

42. Which configuration changes will increment the configuration revision number on the VTP server?

• configuring trunk links on the VTP server
• configuring or changing the VTP password
• configuring or changing the VTP domain name
• configuring or changing the VTP version number
• configuring or deleting a VLAN or creating a VLAN name

43. 

 Refer to the exhibit. Switch SW2 was tested in a lab environment and then inserted into a production network without reloading its configuration. After the trunk link between SW1 and SW2 was brought up, all users lost connectivity to the network. What could be the source of the problem?

• All the VLANs were pruned from the trunk port between SW1 and SW2.
• SW1 and SW2 cannot be both set as VTP servers in the same VTP domain.
• VTP configuration revision number of SW2 was higher than the configuration revision number of SW1.
• The additional VLANs from SW2 created more VLANs than the VLAN database of SW1 could contain.

44. 

 Refer to the exhibit. The network administrator is planning five additional VLANs to be shared throughout the VTP domain on S3. What action should the administrator take before creating the additional VLANs?

• Create the VLANs on a switch in VTP server mode and allow them to propogate to the other switches in the domain.
• Modify the configuration revision to 10 to support the additional VLANs.
• Enable the VTP pruning mode in order to create the VLANs on S3.
• Enable the VTP v2 mode.

45. 

 Refer to the exhibit. What does “FORWARDING” mean in the command output shown?

• The switch is sending and receiving data frames.
• The switch is receiving BPDUs, but not sending data frames.
• The switch is participating in an election process by forwarding the BPDUs it receives.
• The switch is receiving BPDUs and populating the MAC address table, but not sending data.

46. Which parameter is used to uniquely identify one wireless network from another?

• SSID
• OFDM
• WEP
• DSSS

47. Why is MAC address filtering considered a poor choice in securing a WLAN?

• Available bandwidth is reduced.
• MAC addresses are easily spoofed.
• APs are more susceptible to DoS attacks.
• The payload encryption is easily broken.

48. 

 Refer to the exhibit. Users A and B are reporting intermittent connectivity problems. Pre-installation surveys showed strong signal strength from the AP locations to the client locations. Outside electrical interference has been eliminated. What will fix the problem?

• Relocate the APs closer to each other.
• Increase the distance between the clients.
• Change the channel on AP-B to 6 or 11.
• Place AP-A and AP-B on the same wireless channel.

49. Which combination is required to establish a connection to initially configure the Linksys WRT300N wireless access device?

• a computer with a console connection to the WRT300N
• a computer with a wireless connection to the WRT300N
• a computer with an AUX port connection to the WRT300N
• a computer configured in the same IP subnet as the WRT300N and a direct cable connection to it

50. A wireless access point can function as which type of shared medium, wired LAN device?

• hub
• switch
• router
• gateway

51. What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value?

• only the management VLAN
• all VLANs except the extended range VLANs
• all VLANs except 1 and 1002-1005
• all VLANs

52. A wireless client is attempting to establish a connection with a wireless access point. What process does the client use to discover the access points which are available to it?

• probing
• beaconing
• association
• authentication