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質問 # 68
Which device operates at Layer 2 of the OSI model and forwards frames based on MAC addresses within a local network?
正解：D
解説：
A switch operates at the Data Link layer, using MAC address tables to forward frames only to the intended recipient, improving efficiency and reducing unnecessary traffic compared to hubs.
質問 # 69
DRAG DROP
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WEP (Wired Equivalent Privacy) is an outdated security protocol that uses a minimum of 40 bits for encryption (and up to 104 bits), which is relatively weak by today's standards.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 # 70
HOTSPOT
You purchase a new Cisco switch, turn it on, and connect to its console port. You then run the following command:
For each statement about the output, select True or False. Note: You will receive partial credit for each correct selection.
正解：
解説：
Explanation:
The two interfaces are administratively shut down:
False: The output does not show any "shutdown" command under the interfaces, which would indicate that they are administratively shut down. Therefore, they are likely in their default state, which is administratively up.
The two interfaces have default IP addresses assigned:
False: The output does not show any IP address configuration. In the default state, interfaces do not have IP addresses assigned unless explicitly configured.
The two interfaces can communicate over Layer 2:
True: By default, interfaces on a switch are Layer 2 interfaces capable of forwarding Ethernet frames. As there is no configuration provided that changes this, it can be assumed they can communicate over Layer 2.
Interface Status: The absence of the "shutdown" command means the interfaces are not administratively shut down.
IP Address Assignment: There is no evidence in the output that IP addresses have been assigned to the interfaces, which would typically be shown as "ip address" entries.
Layer 2 Communication: Switch interfaces in their default state operate at Layer 2, enabling them to forward Ethernet frames and participate in Layer 2 communication.
Reference: Cisco IOS Interface Configuration: Cisco Interface Configuration
Understanding Cisco Switch Interfaces: Cisco Switch Interfaces
質問 # 71
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：C
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 # 72
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：C
解説：
The Data Link layer adds the MAC address header and a trailer containing the frame check sequence for error detection.
質問 # 73
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