Chapter 1 – Implement VLAN based solution, given a network design and a set of requirements
QUESTION NO: 51
ISL is being configured on a Company switch. Which of the following choices are true regarding the ISL protocol? (Select two)
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.
Answer: B,D
Explanation:
ISL adds a total of 30bytes to the Ethernet frame. A 26 byte header (10bytes identifies the VLAN ID) and a 4 byte trailer (containing a separate CRC).
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