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質問 # 17
A local company requires two networks in two new buildings. The addresses used in these networks must be in the private network range.
Which two address ranges should the company use? (Choose two.)
Note: You will receive partial credit for each correct selection.
正解：A、B
解説：
192.168.0.0-192.168.255.255 is the 192.168.0.0/16 private address block.
172.16.0.0-172.31.255.255 is the 172.16.0.0/12 private address block.
質問 # 18
You have two switches that are connected as shown in the image.
The laptop is connected to port A on the first switch. The second switch is connected to port D on the first switch.
The laptop sends a broadcast frame to the first switch.
You need to identify the ports through which the broadcast frame is forwarded.
Which ports should you identify?
正解：B
解説：
A switch forwards a broadcast frame out all ports except the port on which it was received. Since the frame enters the first switch on port A, it is forwarded out ports B, C, and D.
質問 # 19
During the data encapsulation process, which OSI layer adds a header that contains MAC addressing information and a trailer used for error checking?
正解：B
解説：
During the data encapsulation process, the Data Link layer of the OSI model is responsible for adding a header that contains MAC addressing information and a trailer used for error checking. The header typically includes the source and destination MAC addresses, while the trailer contains a Frame Check Sequence (FCS) which is used for error detection1.
The Data Link layer ensures that messages are delivered to the proper device on a LAN using hardware addresses and translates messages from the Network layer into bits for the Physical layer to transmit. It also controls how data is placed onto the medium and is received from the medium through the physical hardware.
Reference: =
The OSI Model - The 7 Layers of Networking Explained in Plain English
OSI Model - Network Direction
Which layer adds both header and trailer to the data?
What is OSI Model | 7 Layers Explained - GeeksforGeeks
質問 # 20
What is the most compressed valid format of the IPv6 address 2001:0db8:0000:0016:0000:001b:2000:0056?
正解：D
解説：
Removing leading zeros yields 2001:db8:0:16:0:1b:2000:56, and collapsing the longest zero run (the fifth hextet) produces 2001:db8:0:16::1b:2000:56.
質問 # 21
Move the security options from the list on the left to its characteristic on the right. You may use each security option once, more than once, or not at all.
Note: You will receive partial credit for each correct answer.
正解：
解説：
Explanation:
The correct matching of the security options to their characteristics is as follows:
* WPA2-Enterprise: Uses a RADIUS server for authentication
* WEP: Uses a minimum of 40 bits for encryption
* WPA2-Personal: Uses AES and a pre-shared key for authentication
Here's why each security option matches the characteristic:
* WPA2-Enterprise uses a RADIUS server for authentication, which provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service.
* WEP (Wired Equivalent Privacy) is an outdated security protocol that uses a minimum of 40 bits for encryption (and up to 104 bits), which is relatively weak by today's standards.
* WPA2-Personal (Wi-Fi Protected Access 2 - Personal) uses the Advanced Encryption Standard (AES) for encryption and a pre-shared key (PSK) for authentication, which is shared among users to access the network.
These security options are essential for protecting wireless networks from unauthorized access and ensuring data privacy.
質問 # 22
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