Understand what a VLAN is. Virtual LANs are used to break up broadcast domains in a Layer 2 switched internetwork.

Understand how to configure static VLAN assignments.

Static VLAN assignments are created by an administrator manually configuring each switch port to a VLAN.

Understand frame tagging. Frame tagging is used to keep track of frames as they traverse a trunked link. Cisco uses the proprietary ISL method of frame tagging on Fast Ethernet and Gigabit Ethernet links.

Key Terms and Concepts

frame tagging Method used to identify frame membership in a VLAN as the frame traverses a trunked link.

Inter-Switch Link (ISL) Cisco proprietary method of frame tagging for Fast Ethernet and Gigabit Ethernet links.

static VLAN Assignment of a switch port to a VLAN by an administrator.

virtual local area network (VLAN) A logical grouping of network users and resources connected to defined ports on the switch. A VLAN looks like, and is treated like, its own subnet

Points to Remember

Specifically developed for multi-VLAN, inter-switch communication.
Places a unique identifier in the header of each frame.
Removes identifier before frame exits switch on non-trunk links.
Functions at the Data Link layer.
Requires little processing or administrative overhead.
Inter-Switch Link (ISL) frame tagging is a Cisco proprietary frame- tagging method that
encapsulates an existing frame with the VLAN information.

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