A network technician is designing a LAN for a new facility. The company is expecting more than 300 devices to connect to the network. Which of the following masks will provide the most efficient subnet?
Correct Answer: C
The requirement is to support over 300 hosts. The subnet mask 255.255.254.0 (or /23) provides 512 addresses, 510 of which are usable - ideal for around 300 devices. * 255.255.0.0 (/16) provides too many addresses. * 255.255.192.0 (/18) gives 16384 addresses - overkill. * 255.255.255.254 is invalid for host assignments (only 2 addresses, 0 usable). From Andrew Ramdayal's guide: "To support 300 hosts, a /23 subnet (255.255.254.0) offers 510 usable addresses - the most efficient choice without excessive overhead."
Question 157
SIMULATION A network administrator has been tasked with configuring a network for a new corporate office. The office consists of two buildings, separated by 50 feet with no physical connectivity. The configuration must meet the following requirements: . Devices in both buildings should be able to access the Internet. . Security insists that all Internet traffic be inspected before entering the network. . Desktops should not see traffic destined for other devices. INSTRUCTIONS Select the appropriate network device for each location. If applicable, click on the magnifying glass next to any device which may require configuration updates and make any necessary changes. Not all devices will be used, but all locations should be filled. If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Correct Answer:
See the step by step complete solution below Explanation: Devices in both buildings should be able to access the Internet. Security insists that all Internet traffic be inspected before entering the network. Desktops should not see traffic destined for other devices. Here is the corrected layout with explanation: Building A: Switch: Correctly placed to connect all desktops. Firewall: Correctly placed to inspect all incoming and outgoing traffic. Building B: Switch: Not needed. Instead, place a Wireless Access Point (WAP) to provide wireless connectivity for laptops and mobile devices. Between Buildings: Wireless Range Extender: Correctly placed to provide connectivity between the buildings wirelessly. Connection to the Internet: Router: Correctly placed to connect to the Internet and route traffic between the buildings and the Internet. Firewall: The firewall should be placed between the router and the internal network to inspect all traffic before it enters the network. Corrected Setup: Top-left (Building A): Switch Bottom-left (Building A): Firewall (inspect traffic before it enters the network) Top-middle (Internet connection): Router Bottom-middle (between buildings): Wireless Range Extender Top-right (Building B): Wireless Access Point (WAP) In this corrected setup, the WAP in Building B will connect wirelessly to the Wireless Range Extender, which is connected to the Router. The Router is connected to the Firewall to ensure all traffic is inspected before it enters the network. Configuration for Wireless Range Extender: SSID: CORP Security Settings: WPA2 or WPA2 - Enterprise Key or Passphrase: [Enter a strong passphrase] Mode: [Set based on your network plan] Channel: [Set based on your network plan] Speed: Auto Duplex: Auto With these settings, both buildings will have secure access to the Internet, and all traffic will be inspected by the firewall before entering the network. Desktops and other devices will not see traffic intended for others, maintaining the required security and privacy. To configure the wireless range extender for security, follow these steps: SSID (Service Set Identifier): Ensure the SSID is set to "CORP" as shown in the exhibit. Security Settings: WPA2 or WPA2 - Enterprise: Choose one of these options for stronger security. WPA2-Enterprise provides more robust security with centralized authentication, which is ideal for a corporate environment. Key or Passphrase: If you select WPA2, enter a strong passphrase in the "Key or Passphrase" field. If you select WPA2 - Enterprise, you will need to configure additional settings for authentication servers, such as RADIUS, which is not shown in the exhibit. Wireless Mode and Channel: Set the appropriate mode and channel based on your network design and the environment to avoid interference. These settings are not specified in the exhibit, so set them according to your network plan. Wired Speed and Duplex: Set the speed to "Auto" unless you have specific requirements for 100 or 1000 Mbps. Set the duplex to "Auto" unless you need to specify half or full duplex based on your network equipment. Save Configuration: After making the necessary changes, click the "Save" button to apply the settings. Here is how the configuration should look after adjustments: SSID: CORP Security Settings: WPA2 or WPA2 - Enterprise Key or Passphrase: [Enter a strong passphrase] Mode: [Set based on your network plan] Channel: [Set based on your network plan] Speed: Auto Duplex: Auto Once these settings are configured, your wireless range extender will provide secure connectivity for devices in both buildings. Firewall setting to to ensure complete compliance with the requirements and best security practices, consider the following adjustments and additions: DNS Rule: This rule allows DNS traffic from the internal network to any destination, which is fine. HTTPS Outbound: This rule allows HTTPS traffic from the internal network (assuming 192.169.0.1/24 is a typo and should be 192.168.0.1/24) to any destination, which is also good for secure web browsing. Management: This rule allows SSH access to the firewall for management purposes, which is necessary for administrative tasks. HTTPS Inbound: This rule denies inbound HTTPS traffic to the internal network, which is good unless you have a web server that needs to be accessible from the internet. HTTP Inbound: This rule denies inbound HTTP traffic to the internal network, which is correct for security purposes. Suggested Additional Settings: Permit General Outbound Traffic: Allow general outbound traffic for web access, email, etc. Block All Other Traffic: Ensure that all other traffic is blocked to prevent unauthorized access. Firewall Configuration Adjustments: Correct the Network Typo: Ensure that the subnet 192.169.0.1/24 is corrected to 192.168.0.1/24. Permit General Outbound Traffic: Rule Name: General Outbound Source: 192.168.0.1/24 Destination: ANY Service: ANY Action: PERMIT Deny All Other Traffic: Rule Name: Block All Source: ANY Destination: ANY Service: ANY Action: DENY Here is how your updated firewall settings should look: Rule Name Source Destination Service Action DNS Rule 192.168.0.1/24 ANY DNS PERMIT HTTPS Outbound 192.168.0.1/24 ANY HTTPS PERMIT Management ANY 192.168.0.1/24 SSH PERMIT HTTPS Inbound ANY 192.168.0.1/24 HTTPS DENY HTTP Inbound ANY 192.168.0.1/24 HTTP DENY General Outbound 192.168.0.1/24 ANY ANY PERMIT Block All ANY ANY ANY DENY These settings ensure that: Internal devices can access DNS and HTTPS services externally. Management access via SSH is permitted. Inbound HTTP and HTTPS traffic is denied unless otherwise specified. General outbound traffic is allowed. All other traffic is blocked by default, ensuring a secure environment. Make sure to save the settings after making these adjustments.
Question 158
Which of the following connection methods allows a network engineer to automate the configuration deployment for network devices across the environment?
Correct Answer: D
Comprehensive and Detailed Explanation (aligned to N10-009): APIs (Application Programming Interfaces) allow automation tools and scripts to push configurations to network devices programmatically. Modern network automation platforms rely on APIs to ensure consistency and scalability. A . RDP is remote desktop for Windows systems, not automation. B . Telnet is insecure and manual. C . GUI requires manual configuration, not automation. Reference (CompTIA Network+ N10-009):
Question 159
A VoIP phone is plugged in to a port but cannot receive calls. Which of the following needs to be done on the port to address the issue?
Correct Answer: C
Understanding VoIP and VLANs: VoIP (Voice over IP) phones often use VLANs (Virtual Local Area Networks) to separate voice traffic from data traffic for improved performance and security. Tagging Traffic to Voice VLAN: Voice VLAN Configuration: The port on the switch needs to be configured to tag traffic for the specific voice VLAN. This ensures that voice packets are prioritized and handled correctly. VLAN Tagging: VLAN tagging allows the switch to identify and separate voice traffic from other types of traffic on the network, reducing latency and jitter for VoIP communications. Comparison with Other Options: Trunk all VLANs on the port: Trunking all VLANs is typically used for links between switches, not for individual device ports. Configure the native VLAN: The native VLAN is for untagged traffic and does not address the need for separating and prioritizing voice traffic. Disable VLANs: Disabling VLANs would mix voice and data traffic, leading to potential performance issues and lack of traffic separation. Implementation: Configure the switch port connected to the VoIP phone to tag the traffic for the designated voice VLAN, ensuring proper network segmentation and quality of service. Reference: CompTIA Network+ study materials on VLAN configuration and VoIP implementation.
Question 160
A network administrator is deploying a new switch and wants to make sure that the default priority value was set for a spanning tree. Which of the following values would the network administrator expect to see?
Correct Answer: C
* Understanding Spanning Tree Protocol (STP): * STP is used to prevent network loops in Ethernet networks by creating a spanning tree that selectively blocks some redundant paths. * Default Priority Value: * Bridge Priority:STP uses bridge priority to determine which switch becomes the root bridge. The default bridge priority value for most switches is 32768. * Priority Range:The bridge priority can be set in increments of 4096, ranging from 0 to 61440. * Configuration and Verification: * When deploying a new switch, the network administrator can verify the bridge priority using commands such asshow spanning-treeto ensure it is set to the default value of 32768. * Comparison with Other Values: * 4096 and 8192:Lower than the default priority, indicating these would be manually configured for higher preference. * 36684:A non-standard value, likely a result of specific configuration changes. References: * CompTIA Network+ study materials on Spanning Tree Protocol and network configuration.
