ISL is being configured on a Company switch. Which of the following choices are true regarding the ISL protocol？ （）A、 It can be used between Cisco and non-Cisco switch devices.B、 It calculates a new CRC field on top of the existing CRC field.C、 It adds 4 bytes of protocol-specific information to the original Ethernet frame.D、 It adds 30 bytes of protocol-specific information to the original Ethernet frame.
ISL is being configured on a Company switch. Which of the following choices are true regarding the ISL protocol？ （）
- A、 It can be used between Cisco and non-Cisco switch devices.
- B、 It calculates a new CRC field on top of the existing CRC field.
- C、 It adds 4 bytes of protocol-specific information to the original Ethernet frame.
- D、 It adds 30 bytes of protocol-specific information to the original Ethernet frame.
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判断题“0→1.05con （持荷2分钟）→con ”与“0→1.03con ”两种超张拉程序是等效的。A对B错