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質問 # 645
Company C is acquiring Company A and Company B. Company C needs to merge all three networks into one Class B network. Additionally, the network capacity of each company needs to grow by 20%. Company C also requires segmentation of Company A and Company B to account for unknown security vulnerabilities within each.
Instructions:
Select the correct subnet range to meet Company C ' s requirements.
正解：
解説：
Explanation:
A = 192.168.10.0/26
B = 192.168.1.0/23
C = 10.0.0.1/18
Using the choices shown in the screenshot, the best-fit subnet selections are based on host growth requirements first, then segmentation.
For Company A, the current device count is 32. With 20% growth, that becomes about 39 devices. A /27 only supports 30 usable hosts, so it is too small. A /26 supports 62 usable hosts, so 192.168.10.0/26 is the correct choice.
For Company B, the current device count is 100. With 20% growth, that becomes 120 devices. The smallest correct subnet would normally be a /25 with 126 usable hosts, but that option is not shown. From the available choices, 192.168.1.0/23 is the smallest subnet that still supports more than 120 hosts, so that is the best answer.
For Company C, the current device count is 10,000. With 20% growth, it needs space for 12,000 hosts. A /18 provides 16,382 usable hosts, while a /19 is not available and a /21 or /22 would be far too small. Therefore,
10.0.0.1/18 is the correct selection.
One important note: the dropdown choices shown do not actually let all three companies be placed into a single true Class B network block. So these answers are the best valid selections from the provided options.
質問 # 646
Which of the following types of attacks is most likely to occur after an attacker sets up an evil twin?
正解：C
解説：
An evil twin is a malicious wireless access point that impersonates a legitimate SSID. Once victims connect, the attacker can intercept and manipulate traffic, performing an on-path (man-in- the- middle) attack--capturing credentials, injecting content, or downgrading encryption.
質問 # 647
Which of the following disaster recovery metrics is used to describe the amount of data that is lost since the last backup?
正解：C
質問 # 648
Which of the followingnetwork portsis used when a client accesses anSFTPserver?
正解：D
解説：
Comprehensive and Detailed Explanation:
SFTP (Secure File Transfer Protocol)operates overport 22, usingSSH (Secure Shell) encryptionfor secure file transfers.
Breakdown of Options:
* A. 22-Correct answer.SFTP runs overSSH (port 22)for secure file transfers.
* B. 80- Used forHTTP, not SFTP.
* C. 443- Used forHTTPS (secure web traffic).
* D. 3389- Used forRDP (Remote Desktop Protocol).
質問 # 649
An IT manager needs to connect ten sites in a mesh network. Each needs to be secured with reduced provisioning time. Which of the following technologies will best meet this requirement?
正解：B
解説：
* Definition of SD-WAN:
* Software-Defined Wide Area Network (SD-WAN) is a technology that simplifies the management and operation of a WAN by decoupling the networking hardware from its control mechanism. It allows for centralized management and enhanced security.
* Benefits of SD-WAN:
* Reduced Provisioning Time:SD-WAN enables quick and easy deployment of new sites with centralized control and automation.
* Security:Incorporates advanced security features such as encryption, secure tunneling, and integrated firewalls.
* Scalability:Easily scales to accommodate additional sites and bandwidth requirements.
* Comparison with Other Technologies:
* VXLAN (Virtual Extensible LAN):Primarily used for network virtualization within data centers.
* VPN (Virtual Private Network):Provides secure connections but does not offer the centralized management and provisioning efficiency of SD-WAN.
* NFV (Network Functions Virtualization):Virtualizes network services but does not specifically address WAN management and provisioning.
* Implementation:
* SD-WAN solutions are implemented by deploying edge devices at each site and connecting them to a central controller. This allows for dynamic routing, traffic management, and security policy enforcement.
References:
* CompTIA Network+ course materials and networking solution guides.
質問 # 650
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