Describe the two most common types of frame tagging.

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The two most common types of frame tagging (encapsulation) are 802.1q and Inter-Switch Link (ISL) protocol. ISL is a Cisco-proprietary frame-tagging method that uses a 26-byte header. It only works between Cisco devices. If you need a frame-tagging method that works between Cisco and another vendor, you will have to use 802.1q frame tagging. The Cisco 2950 supports 802.1q. The lowest-level Cisco router that supports ISL is the 2600 series. Some Cisco switches support additional types of frame tagging, such as LAN emulation (LANE) and IEEE 802.10 (FDDI).

Computer Science & Information Technology

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Computer Science & Information Technology

Which of the following is a reason to block FTP at the corporate firewall?

A. It does not transfer encrypted files. B. It cannot be tunneled in a VPN. C. It is a deprecated protocol. D. It transmits passwords in clear text.

Computer Science & Information Technology