LAN Switching And Wireless - Chapter 3 Exam
CCNA Exploration v4 - Networking 207 (LAN Switching and Wireless) - Chapter 3 Exam
Retrieved from:http://nj180degree. Net/2010/08/13/ccn3ch3/
See File "Net207 Chapter 3 Exam Modules" on flash drive for Figures and examples
- 1.
Which two statements describe the benefits of VLANs? (Choose two.)
- A.
VLANs improve network performance by regulating flow control and window size.
- B.
VLANs enable switches to route packets to remote networks via VLAN ID filtering.
- C.
VLANs reduce network cost by reducing the number of physical ports required on switches.
- D.
VLANs improve network security by isolating users that have access to sensitive data and applications.
- E.
VLANs divide a network into smaller logical networks, resulting in lower susceptibility to broadcast storms.
Correct Answer(s)
D. VLANs improve network security by isolating users that have access to sensitive data and applications.
E. VLANs divide a network into smaller logical networks, resulting in lower susceptibility to broadcast storms.Explanation
VLANs improve network security by isolating users that have access to sensitive data and applications. By segmenting the network into different VLANs, users in one VLAN cannot directly communicate with users in another VLAN, providing an additional layer of security.
VLANs divide a network into smaller logical networks, resulting in lower susceptibility to broadcast storms. Broadcast storms occur when a network becomes overwhelmed with broadcast traffic, causing network performance issues. By dividing the network into VLANs, broadcast traffic is contained within each VLAN, reducing the impact of broadcast storms and improving overall network performance.Rate this question:
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- 2.
What are two characteristics of VLAN1 in a default switch configuration? (Choose two.)
- A.
VLAN1 should renamed.
- B.
VLAN 1 is the management VLAN.
- C.
All switch ports are members of VLAN1.
- D.
Only switch port 0/1 is assigned to VLAN1.
- E.
Links between switches must be members of VLAN1.
Correct Answer(s)
B. VLAN 1 is the management VLAN.
C. All switch ports are members of VLAN1.Explanation
In a default switch configuration, VLAN1 is the management VLAN, which means it is used for managing and configuring the switch. Additionally, all switch ports are members of VLAN1, which means that by default, all ports are part of this VLAN and can communicate with each other.Rate this question:
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- 3.
Refer to the exhibit CH3-1 (on flash drive). SW1 and SW2 are new switches being installed in the topology shown in the exhibit. Interface Fa0/1 on switch SW1 has been configured with trunk mode “on”. Which statement is true about forming a trunk link between the switches SW1 and SW2?
- A.
Interface Fa0/2 on switch SW2 will negotiate to become a trunk link if it supports DTP
- B.
Nterface Fa0/2 on switch SW2 can only become a trunk link if statically configured as a trunk.
- C.
Interface Fa0/1 converts the neighboring link on the adjacent switch into a trunk link if the neighboring interface is configured in nonegotiate mode.
- D.
Interface Fa0/1 converts the neighboring link on the adjacent switch into a trunk link automatically with no consideration of the configuration on the neighboring interface.
Correct Answer
A. Interface Fa0/2 on switch SW2 will negotiate to become a trunk link if it supports DTPExplanation
DTP (Dynamic Trunking Protocol) is a Cisco proprietary protocol used to negotiate trunk links between switches. If Interface Fa0/2 on switch SW2 supports DTP, it will negotiate with Interface Fa0/1 on switch SW1, which has been configured with trunk mode "on", to form a trunk link.Rate this question:
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- 4.
Refer to the exhibit CH3-2 (on flash drive). Computer 1 sends a frame to computer 4. On which links along the path between computer 1 and computer 4 will a VLAN ID tag be included with the frame?
- A.
A
- B.
A,B
- C.
A,B,D,G
- D.
A,D,F
- E.
C,E
- F.
C,E,F
Correct Answer
E. C,EExplanation
A VLAN ID tag will be included with the frame on links C and E along the path between computer 1 and computer 4.Rate this question:
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- 5.
The network administrator wants to separate hosts in Building A into two VLANs numbered 20 and 30. Which two statements are true concerning VLAN configuration? (Choose two.)
- A.
The VLANs may be named.
- B.
VLAN information is saved in the startup configuration.
- C.
Non-default VLANs created manually must use the extended range VLAN numbers.
- D.
The network administrator may create the VLANs in either global configuration mode or VLAN database mode.
- E.
Both VLANs may be named BUILDING_A to distinguish them from other VLANs in different geographical locations.
Correct Answer(s)
A. The VLANs may be named.
D. The network administrator may create the VLANs in either global configuration mode or VLAN database mode.Explanation
The VLANs may be named: This means that the network administrator has the option to assign a name to each VLAN, such as "VLAN20" and "VLAN30", to easily identify and distinguish them.
The network administrator may create the VLANs in either global configuration mode or VLAN database mode: This means that the network administrator has flexibility in choosing the mode to create the VLANs. They can either create them in the global configuration mode or in the VLAN database mode, depending on their preference and the specific requirements of the network.Rate this question:
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- 6.
Refer to the exhibit CH3-3 (on flash drive). Which two conclusions can be drawn regarding the switch that produced the output shown? (Choose two.)
- A.
The network administrator configured VLANs 1002-1005.
- B.
The VLANs are in the active state and are in the process of negotiating configuration parameters.
- C.
A FDDI trunk has been configured on this switch.
- D.
The command switchport access vlan 20 was entered in interface configuration mode for Fast Ethernet interface 0/1.
- E.
Devices attached to ports fa0/5 through fa0/8 cannot communicate with devices attached to ports fa0/9 through fa0/12 without the use of a Layer 3 device.
Correct Answer(s)
D. The command switchport access vlan 20 was entered in interface configuration mode for Fast Ethernet interface 0/1.
E. Devices attached to ports fa0/5 through fa0/8 cannot communicate with devices attached to ports fa0/9 through fa0/12 without the use of a Layer 3 device.Explanation
Based on the given output, we can conclude that the command "switchport access vlan 20" was entered in interface configuration mode for Fast Ethernet interface 0/1. This means that the devices connected to this interface will be assigned to VLAN 20. Additionally, devices attached to ports fa0/5 through fa0/8 cannot communicate with devices attached to ports fa0/9 through fa0/12 without the use of a Layer 3 device. This suggests that these ports are in different VLANs or subnets, requiring a Layer 3 device for communication between them.Rate this question:
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- 7.
What happens to the member ports of a VLAN when the VLAN is deleted?
- A.
The ports cannot communicate with other ports.
- B.
The ports default back to the management VLAN.
- C.
The ports automatically become a part of VLAN1.
- D.
The ports remain a part of that VLAN until the switch is rebooted. They then become members of the management VLAN.
Correct Answer
A. The ports cannot communicate with other ports.Explanation
When a VLAN is deleted, the member ports of that VLAN lose their ability to communicate with other ports. This means that any traffic or data that was previously being transmitted between those ports will no longer be able to reach its intended destination. The deletion of the VLAN effectively isolates the member ports and prevents them from exchanging information with other ports on the network.Rate this question:
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- 8.
A network administrator is removing several VLANs from a switch. When the administrator enters the no vlan 1 command, an error is received. Why did this command generate an error?
- A.
VLAN 1 can never be deleted.
- B.
VLAN 1 can only be deleted by deleting the vlan.dat file.
- C.
VLAN 1 can not be deleted until all ports have been removed from it.
- D.
VLAN 1 can not be deleted until another VLAN has been assigned its responsibilities.
Correct Answer
A. VLAN 1 can never be deleted.Explanation
The command "no vlan 1" generated an error because VLAN 1 can never be deleted. VLAN 1 is the default VLAN and it is always present on a switch. It is used for administrative purposes and cannot be removed or deleted.Rate this question:
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- 9.
What is the effect of the switchport mode dynamic desirable command?
- A.
DTP cannot negotiate the trunk since the native VLAN is not the default VLAN.
- B.
The remote connected interface cannot negotiate a trunk unless it is also configured as dynamic desirable.
- C.
The connected devices dynamically determine when data for multiple VLANs must be transmitted across the link and bring the trunk up as needed.
- D.
A trunk link is formed if the remote connected device is configured with the switchport mode dynamic auto or switchport mode trunk commands.
Correct Answer
D. A trunk link is formed if the remote connected device is configured with the switchport mode dynamic auto or switchport mode trunk commands.Explanation
The switchport mode dynamic desirable command allows the connected devices to dynamically determine when data for multiple VLANs needs to be transmitted across the link and brings the trunk up as needed. A trunk link is formed if the remote connected device is configured with the switchport mode dynamic auto or switchport mode trunk commands.Rate this question:
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- 10.
Refer to the exhibit CH3-4 (on flash drive). The exhibited configurations do not allow the switches to form a trunk. What is the most likely cause of this problem?
- A.
Cisco switches only support the ISL trunking protocol.
- B.
The trunk cannot be negotiated with both ends set to auto.
- C.
By default, Switch1 will only allow VLAN 5 across the link.
- D.
A common native VLAN should have been configured on the switches.
Correct Answer
B. The trunk cannot be negotiated with both ends set to auto.Explanation
The most likely cause of the problem is that the trunk cannot be negotiated with both ends set to auto. This means that the switches are not able to automatically determine and agree on the trunking protocol to be used. Cisco switches only support the ISL trunking protocol, so if both ends are set to auto, they will not be able to establish a trunk. To resolve this issue, the trunking protocol should be manually configured on both switches to ensure compatibility.Rate this question:
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- 11.
Switch port fa0/1 was manually configured as a trunk, but now it will be used to connect a host to the network. How should the network administrator reconfigure switch port Fa0/1?
- A.
Disable DTP.
- B.
Delete any VLANs currently being trunked through port Fa0/1.
- C.
Administratively shut down and re-enable the interface to return it to default.
- D.
Enter the switchport mode access command in interface configuration mode.
Correct Answer
D. Enter the switchport mode access command in interface configuration mode.Explanation
The network administrator should reconfigure switch port Fa0/1 by entering the switchport mode access command in interface configuration mode. This command will change the port from trunk mode to access mode, allowing it to connect a host to the network.Rate this question:
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- 12.
Refer to the exhibit CH3-5 (on flash drive). Computer B is unable to communicate with computer D. What is the most likely cause of this problem?
- A.
The link between the switches is up but not trunked.
- B.
VLAN 3 is not an allowed VLAN to enter the trunk between the switches.
- C.
The router is not properly configured to route traffic between the VLANs.
- D.
Computer D does not have a proper address for the VLAN 3 address space.
Correct Answer
D. Computer D does not have a proper address for the VLAN 3 address space.Explanation
The most likely cause of the problem is that Computer D does not have a proper address for the VLAN 3 address space. This means that Computer D is not configured with the correct IP address or subnet mask for the VLAN 3 network. As a result, it is unable to communicate with other devices on that VLAN.Rate this question:
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- 13.
Refer to the exhibit CH3-6 (on flash drive). The network administrator has just added VLAN 50 to Switch1 and Switch2 and assigned hosts on the IP addresses of the VLAN in the 10.1.50.0/24 subnet range. Computer A can communicate with computer B, but not with computer C or computer D. What is the most likely cause of this problem?
- A.
There is a native VLAN mismatch.
- B.
The link between Switch1 and Switch2 is up but not trunked.
- C.
The router is not properly configured for inter-VLAN routing.
- D.
VLAN 50 is not allowed to entering the trunk between Switch1 and Switch2.
Correct Answer
D. VLAN 50 is not allowed to entering the trunk between Switch1 and Switch2.Explanation
The most likely cause of the problem is that VLAN 50 is not allowed to enter the trunk between Switch1 and Switch2. This means that the VLAN is not being properly transmitted between the two switches, causing the communication issue between Computer A, Computer C, and Computer D. To resolve this problem, VLAN 50 needs to be allowed on the trunk between the switches.Rate this question:
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- 14.
Refer to the exhibit CH-7 (on flash drive). Which statement is true concerning interface Fa0/5?
- A.
The default native VLAN is being used.
- B.
The trunking mode is set to auto.
- C.
Trunking can occur with non-Cisco switches.
- D.
VLAN information about the interface encapsulates the Ethernet frames.
Correct Answer
C. Trunking can occur with non-Cisco switches.Explanation
Trunking can occur with non-Cisco switches. This is because trunking is a feature that allows multiple VLANs to be carried over a single physical link between switches. It is not limited to Cisco switches and can be supported by switches from other vendors as well. Therefore, it is true that trunking can occur with non-Cisco switches.Rate this question:
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- 15.
What statements describe how hosts on VLANs communicate?
- A.
Hosts on different VLANs use VTP to negotiate a trunk.
- B.
Hosts on different VLANs communicate through routers.
- C.
Hosts on different VLANs should be in the same IP network.
- D.
Hosts on different VLANs examine VLAN ID in the frame tagging to determine if the frame for their network.
Correct Answer
B. Hosts on different VLANs communicate through routers.Explanation
Hosts on different VLANs communicate through routers. This is because VLANs are logical networks that are separated from each other, and in order for hosts on different VLANs to communicate, they need to go through a router. The router acts as a bridge between the VLANs, allowing traffic to be routed between them. VTP is a protocol used for VLAN management, but it is not used for communication between hosts on different VLANs. The statement about hosts on different VLANs needing to be in the same IP network is incorrect, as VLANs can have different IP networks assigned to them. The statement about examining the VLAN ID in frame tagging is true, but it is not the method by which hosts on different VLANs communicate with each other.Rate this question:
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- 16.
Refer to the exhibit CH3-8 (on flash drive). How far is a broadcast frame that is sent by computer A propagated in the LAN domain?
- A.
None of the computers will receive the broadcast frame
- B.
Computer A, computer B, computer C
- C.
Computer A, computer D, computer G
- D.
Computer B, computer C
- E.
Computer D, computer G
- F.
Computer A, computer B, computer C, computer D, computer E, computer F, computer G, computer H, computer I
Correct Answer
E. Computer D, computer GExplanation
The correct answer is computer D, computer G. This means that a broadcast frame sent by computer A will only be propagated to computer D and computer G in the LAN domain. The other computers (B, C, E, F, H, I) will not receive the broadcast frame.Rate this question:
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- 17.
What is a valid consideration for planning VLAN traffic across multiple switches?
- A.
Configuring interswitch connections as trunks will cause all hosts on any VLAN to receive broadcasts from the other VLANs.
- B.
A trunk connection is affected by broadcast storms on any particular VLAN that is carried by that trunk.
- C.
Restricting trunk connections between switches to a single VLAN will improve efficiency of port usage.
- D.
Carrying all required VLANs on a single access port will ensure proper traffic separation.
Correct Answer
B. A trunk connection is affected by broadcast storms on any particular VLAN that is carried by that trunk.Explanation
Configuring interswitch connections as trunks means that multiple VLANs can be carried over the same connection. In the case of a broadcast storm occurring on one VLAN, it can affect the entire trunk connection, causing performance issues and potentially affecting all VLANs carried by that trunk. Therefore, this is a valid consideration when planning VLAN traffic across multiple switches.Rate this question:
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- 18.
What statement about the 802.1q trunking protocol is true?
- A.
802.1q is Cisco proprietary.
- B.
802.1q frames are mapped to VLANs by MAC address.
- C.
802.1q does NOT require the FCS of the original frame to be recalculated.
- D.
802.1q will not perform operations on frames that are forwarded out access ports.
Correct Answer
D. 802.1q will not perform operations on frames that are forwarded out access ports. -
- 19.
What switch port modes will allow a switch to successfully form a trunking link if the neighboring switch port is in “dynamic desirable” mode?
- A.
Dynamic desirable mode
- B.
On or dynamic desirable mode
- C.
On, auto, or dynamic desirable mode
- D.
On, auto, dynamic desirable, or nonegotiate mode
Correct Answer
C. On, auto, or dynamic desirable modeExplanation
The correct answer is on, auto, or dynamic desirable mode. In dynamic desirable mode, a switch port actively tries to form a trunking link with the neighboring switch port. The neighboring switch port can be in any of the three modes - on, auto, or dynamic desirable - for the trunking link to be successfully formed. These modes allow the switches to negotiate and determine whether to form a trunk or not.Rate this question:
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- 20.
Refer to the exhibit CH3-9 (on flash drive). Company HR is adding PC4, a specialized application workstation, to a new company office. The company will add a switch, S3, connected via a trunk link to S2, another switch. For security reasons the new PC will reside in the HR VLAN, VLAN 10. The new office will use the 172.17.11.0/24 subnet. After installation, users on PC1 are unable to access shares on PC4. What is the likely cause?
- A.
The switch to switch connection must be configured as an access port to permit access to VLAN 10 on S3.
- B.
The new PC is on a different subnet so Fa0/2 on S3 must be configured as a trunk port.
- C.
PC4 must use the same subnet as PC1.
- D.
A single VLAN cannot span multiple switches.
Correct Answer
C. PC4 must use the same subnet as PC1.Explanation
The likely cause for the users on PC1 being unable to access shares on PC4 is that PC4 must use the same subnet as PC1. Since they are on different subnets, they are unable to communicate with each other.Rate this question:
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- 21.
What must the network administrator do to remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3?
- A.
Enter the no vlan 2 and the vlan 3 commands in global configuration mode.
- B.
Enter the switchport access vlan 3 command in interface configuration mode.
- C.
Enter the switchport trunk native vlan 3 command in interface configuration mode.
- D.
Enter the no shutdown in interface configuration mode to return it to the default configuration and then configure the port for VLAN 3.
Correct Answer
B. Enter the switchport access vlan 3 command in interface configuration mode.Explanation
To remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3, the network administrator should enter the "switchport access vlan 3" command in interface configuration mode. This command specifically assigns the interface to VLAN 3, removing it from VLAN 2.Rate this question:
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