A switch is a device that forwards frames from any of input ports to specific output port based on MAC address.
Overview- Functions of Switch- Methods of Switching- Multilayer Switching – Ethernet Technology

A VLAN is a logical LAN which is used to segment the broadcast domain.
Overview- VLAN Database- Static VLAN- Dynamic VLAN- Advantages of VLAN

A trunk is point – to – point link that carries traffic for more than one VLAN.
Overview- Trunking Protocols- Dynamic Trunking Protocol (DTP) – Native VLAN

VLAN Trunking Protocol runs over trunk links and synchronizes the VLAN databases of all switches in the VTP domain.
Overview- VTP Modes- VTP Domain Name- VTP Configuration Revision Number- VTP Version

STP is used to avoid loops in the switched network and to provide redundancy.
Overview- STP Election- PVST- RSTP- MST- Port Fast- Uplink fast- Backbone Fast- BPDU filter- BPDU Guard- Root Guard- Loop Guard- UDLD

An Ether channel is a way of combining several physical links between switches into one logical connection.
Overview- Port Aggregation Protocol (PAgP) – Link Aggregation Control Protocol (LACP)

Inter VLAN Routing is used to enable communication between different VLANs.
Overview- Router On a stick- Routed Ports- Switched Virtual Interface- Multi Layer Switching- Cisco Express Forwarding

Gateway Redundancy Protocol is used to provide L3 Redundancy and Load balancing.
Overview- Hot Standby Router Protocol- Virtual Router Redundancy Protocol- Gateway Load Balancing Protocol- Preempt- Interface Tracking

It is to prevent and monitor unauthorized access, misuse, modification, or denial of the computer network and network-accessible resources.
Overview- MAC Address Flooding Attack- Port Security- Port Based Authentication- Spoofing Attacks- DHCP Snooping- VACL- Private VLANs- Dynamic ARP Inspection

Voice VLAN enables access ports to carry IP voice traffic from an IP Phone.
Overview- IP Phone- Voice VLAN- Quality of Service- DSCP- COS- Power over Ethernet