Question # 1
| A network administrator needs to divide 192.168.1.0/24 into two equal halves. Which of the following subnet masks should the administrator use? | | A. 255.255.0.0 | | B. 255.255.254.0 | | C. 255.255.255.0 | | D. 255.255.255.128 |
D. 255.255.255.128
Explanation:
Understanding Subnetting:
Original Network: 192.168.1.0/24 has a subnet mask of 255.255.255.0, which allows for 256 IP addresses (including network and broadcast addresses).
Objective: Divide this network into two equal subnets.
Calculating Subnet Mask:
New Subnet Mask: To divide 192.168.1.0/24 into two equal halves, we need to borrow one bit from the host portion of the address, changing the subnet mask to 255.255.255.128 (/25).
Subnet Breakdown:
First Subnet: 192.168.1.0/25 (192.168.1.0 - 192.168.1.127)
Second Subnet: 192.168.1.128/25 (192.168.1.128 - 192.168.1.255)
Verification:
Each subnet now has 128 IP addresses (126 usable IP addresses, excluding the network and broadcast addresses).
Comparison with Other Options:
255.255.0.0 (/16): Provides a much larger network, not dividing the original /24 network.
255.255.254.0 (/23): Also creates a larger subnet, encompassing more than the original /24 network.
255.255.255.0 (/24): Maintains the original subnet size, not dividing it.
References:
CompTIA Network+ study materials on subnetting and IP addressing.
Question # 2
| A newtwork administrator needs to create an SVI on a Layer 3-capable device to separate voice and data traffic. Which of the following best explains this use case? | | A. A physical interface used for trunking logical ports | | B. A physical interface used for management access | | C. A logical interface used for the routing of VLANs | | D. A logical interface used when the number of physical ports is insufficent. |
C. A logical interface used for the routing of VLANs
Explanation:
An SVI (Switched Virtual Interface) is a logical interface on a Layer 3-capable switch used to route traffic between VLANs. This is particularly useful in environments where voice and data traffic need to be separated, as each type of traffic can be assigned to different VLANs and routed accordingly.
SVI (Switched Virtual Interface): A virtual interface created on a switch for inter-VLAN routing.
VLAN Routing: Enables the routing of traffic between VLANs on a Layer 3 switch, allowing for logical separation of different types of traffic, such as voice and data.
Use Case: Commonly used in scenarios where efficient and segmented traffic management is required, such as in VoIP implementations.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Discusses VLANs, SVIs, and their applications in network segmentation and routing.
Cisco Networking Academy: Provides training on VLAN configuration and inter-VLAN routing using SVIs.
Network+ Certification All-in-One Exam Guide: Covers network segmentation techniques, including the use of SVIs for VLAN routing.
Question # 3
| Early in the morning, an administrator installs a new DHCP server. In the afternoon, some users report they are experiencing network outages. Which of the following is the most likely issue? | | A. Theadministrator didnot provisionenough IP addresses. | | B. Theadministrator configured an incorrect default gateway. | | C. Theadministrator didnot provisionenough routes. | | D. Theadministrator didnot provisionenough MAC addresses. |
A. Theadministrator didnot provisionenough IP addresses.
Explanation:
When a DHCP server is installed and not enough IP addresses are provisioned, users may start experiencing network outages once the available IP addresses are exhausted. DHCP servers assign IP addresses to devices on the network, and if the pool of addresses is too small, new devices or those renewing their lease may fail to obtain an IP address, resulting in network connectivity issues.References: CompTIA Network+ study materials.
Question # 4
| Which of the following most likely requires the use of subinterfaces? | | A. A router with only one available LAN port | | B. A firewall performing deep packet inspection | | C. A hub utilizing jumbo frames | | D. A switch using Spanning Tree Protocol |
A. A router with only one available LAN port
Explanation:
Introduction to Subinterfaces:
Subinterfaces are logical interfaces created on a single physical interface. They are used to enable a router to support multiple networks on a single physical interface.
Use Case for Subinterfaces:
Subinterfaces are commonly used in scenarios where VLANs are implemented. A router with a single physical LAN port can be configured with multiple subinterfaces, each associated with a different VLAN.
This setup allows the router to route traffic between different VLANs.
Example Configuration:
Consider a router with a single physical interface GigabitEthernet0/0 and two VLANs, 10 and 20. interface GigabitEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
!
interface GigabitEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.20.1 255.255.255.0
The encapsulation dot1Q command specifies the VLAN ID.
Explanation of the Options:
A. A router with only one available LAN port: This is correct. Subinterfaces allow a single physical interface to manage multiple networks, making it essential for routers with limited physical interfaces.
B. A firewall performing deep packet inspection: Firewalls can use subinterfaces, but it is not a requirement for deep packet inspection.
C. A hub utilizing jumbo frames: Hubs do not use subinterfaces as they operate at Layer 1 and do not manage IP addressing.
D. A switch using Spanning Tree Protocol: STP is a protocol for preventing loops in a network and does not require subinterfaces.
Conclusion:
Subinterfaces provide a practical solution for routing between multiple VLANs on a router with limited physical interfaces. They allow network administrators to optimize the use of available hardware resources efficiently.
References:
CompTIA Network+ guide detailing VLAN configurations and the use of subinterfaces (see page Ref 9†Basic Configuration Commands).
Question # 5
A network administrator wants users to be able to authenticate to the corporate network using a port-based authentication framework when accessing both wired and wireless devices. Which of the following is the best security feature to accomplish this task?
| A. 802.1X
| B. Access control list
| C. Port security
| D. MAC filtering
|
A. 802.1X
Explanation:
802.1X is a port-based network access control (PNAC) protocol that provides an authentication mechanism to devices wishing to connect to a LAN or WLAN. It is widely used for secure network access, ensuring that only authenticated devices can access the network, whether they are connecting via wired or wireless means. 802.1X works in conjunction with an authentication server, such as RADIUS, to validate the credentials of devices trying to connect.
References:
CompTIA Network+ study materials.
Question # 6
| A network administrator is in the process of installing 35 PoE security cameras. After the administrator installed and tested the new cables, the administrator installed the cameras. However, a small number of the cameras do not work. Which of the following is the most reason? | | A. Incorrect wiring standard | | B. Power budget exceeded | | C. Signal attenuation | | D. Wrong voltage |
B. Power budget exceeded
Explanation:
When installing multiple Power over Ethernet (PoE) devices like security cameras, it is crucial to ensure that the total power requirement does not exceed the power budget of the PoE switch. Each PoE switch has a maximum power capacity, and exceeding this capacity can cause some devices to fail to receive power.
PoE Standards: PoE switches conform to standards such as IEEE 802.3af (PoE) and 802.3at (PoE+), each with specific power limits per port and total power capacity.
Power Calculation: Adding up the power requirements of all connected PoE devices can help determine if the total power budget of the switch is exceeded.
Symptoms: When the power budget is exceeded, some devices, typically those farthest from the switch or connected last, may not power up or function correctly.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Covers PoE standards and troubleshooting power issues.
Cisco Networking Academy: Discusses PoE technologies, power budgeting, and managing PoE devices.
Network+ Certification All-in-One Exam Guide: Provides information on PoE setup, including power budget considerations.
Question # 7
A newtwork administrator needs to create an SVI on a Layer 3-capable device to separate voice and data traffic. Which of the following best explains this use case?
| A. A physical interface used for trunking logical ports
| B. A physical interface used for management access
| C. A logical interface used for the routing of VLANs
| D. A logical interface used when the number of physical ports is insufficent.
|
C. A logical interface used for the routing of VLANs
Explanation:
An SVI (Switched Virtual Interface) is a logical interface on a Layer 3-capable switch used to route traffic between VLANs. This is particularly useful in environments where voice and data traffic need to be separated, as each type of traffic can be assigned to different VLANs and routed accordingly.
SVI (Switched Virtual Interface): A virtual interface created on a switch for inter-VLAN routing.
VLAN Routing: Enables the routing of traffic between VLANs on a Layer 3 switch, allowing for logical separation of different types of traffic, such as voice and data.
Use Case: Commonly used in scenarios where efficient and segmented traffic management is required, such as in VoIP implementations.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Discusses VLANs, SVIs, and their applications in network segmentation and routing.
Cisco Networking Academy: Provides training on VLAN configuration and inter-VLAN routing using SVIs.
Network+ Certification All-in-One Exam Guide: Covers network segmentation techniques, including the use of SVIs for VLAN routing.
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