14 What is the auto-MDIX feature on a switch?
Othe automatic configuration of full-duplex operation over a single Ethernet copper or optical catse
the automatic configuration of an interface for 10/100/1000 Mt’s operation
Othe automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
the ability to tum a switch interface on or off accordingly if an active connection in detected
15 What is the auto-MDIX feature?
Ott enables a device to automatically configure the duplex settings of a segmenit
It enables a switch to dynamically select the forwanting method
It enables a device to automatically configure the speed of its interface
It enables a device to automatically configure an interface to une a straight-through or a crossover cable
18 When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?
destination MAC address in the header
Osource MAC address in the header
CRC in the trailer
protocol type in the header
19 Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Adds Layer 2 control information to network protocol data
Places information in the frame that identifies which network layer protocol is being used for the frame
integrates vanous physical technologies
Contions the NIC responsible for sending and receiving data on the physical medium.
Performs data encapsulation
The Correct Answer and Explanation is :
14. What is the auto-MDIX feature on a switch?
Answer:
The automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection.
Explanation:
Auto-MDIX (Automatic Medium-Dependent Interface Crossover) is a feature found in many modern network switches. It automatically detects the type of Ethernet cable (straight-through or crossover) connected to a port and adjusts the port’s configuration accordingly. In older networking technologies, the type of cable used depended on the devices being connected; for example, a straight-through cable would be used to connect a switch to a computer, and a crossover cable would be used to connect two similar devices (e.g., switch to switch or computer to computer). With auto-MDIX, these distinctions are no longer necessary, as the switch will detect the type of connection and automatically adjust the port’s wiring configuration. This helps to simplify network setup and reduce the need for specific cables, making network management more efficient.
15. What is the auto-MDIX feature?
Answer:
It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
Explanation:
Similar to the explanation above, the auto-MDIX feature in network devices like switches allows them to automatically detect and configure their ports based on the type of Ethernet cable used. Historically, crossover cables were required to connect devices of the same type (e.g., switch-to-switch, or computer-to-computer), while straight-through cables were used for device-to-different-device connections (e.g., computer-to-switch). With the auto-MDIX functionality, the device detects the cable type and automatically adjusts the internal wiring of the port to match the connection type, whether straight-through or crossover, making networking simpler and more flexible.
18. When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?
Answer:
CRC in the trailer.
Explanation:
The store-and-forward method is a technique used by network switches to receive and store the entire Ethernet frame before forwarding it to the next destination. One of the key components of this process is error checking, which is done using the CRC (Cyclic Redundancy Check) located in the trailer of the Ethernet frame. The CRC is a checksum that ensures the integrity of the transmitted data. When a switch receives a frame, it verifies the CRC to check for any transmission errors before forwarding the frame. If the CRC doesn’t match the expected value, the frame is discarded, ensuring that only error-free data is forwarded.
19. Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Answer:
- Adds Layer 2 control information to network protocol data.
- Places information in the frame that identifies which network layer protocol is being used for the frame.
Explanation:
The LLC (Logical Link Control) sublayer is part of the Data Link Layer in the OSI model. It is responsible for managing the communication between devices and providing error detection and control mechanisms. Specifically, the LLC sublayer:
- Adds Layer 2 control information: It handles the encapsulation of data by adding control information that allows higher layers to manage the communication effectively.
- Identifies the network layer protocol: It identifies which protocol is being used in the network layer, such as IP or IPX, by including this information in the frame.
The LLC sublayer is critical for ensuring that the data is correctly managed and forwarded between devices on the network, as it handles essential tasks like error detection and protocol identification.
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