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Showing posts with the label Networking

A: VLAN Configuration

·          VLANs are broadcast domains defined within switches to allow control of broadcast, multicast, unicast, and unknown unicast within a Layer 2 device. ·          VLANs are defined on a switch in an internal database known as the VLAN Trunking Protocol (VTP) database . After a VLAN has been created, ports are assigned to the VLAN. ·          VLANs are assigned numbers for identification within and between switches. Cisco switches have two ranges of VLANs, the normal range and extended range . ·          VLANs have a variety of configurable parameters, including name, type, and state. ·          Several VLANs are reserved, and some can be used for internal purposes within the switch. Creation of an Ethernet VLAN VLANs are created on Layer 2 switches to control broadcasts and enfor...

Private VLANs

·          Private VLANs allow for additional security between devices in a common subnet. ·          Private edge VLANs can be configured to prevent connectivity between devices on access switches. ·          Private VLANs can be configured on the Catalyst 6000 and Catalyst 4000 series products. ·          Within a private VLAN, you can isolate devices to prevent connectivity between devices within the isolated VLAN. ·          Within a private VLAN, communities can be created to allow connection between some devices and to prevent them from communicating with others. ·          Promiscuous ports are mapped to private VLANs to allow for connectivity to VLANs outside of this network. Configuring Private VLANs Private VLANs provide a mechanism to cont...

VLAN Trunking Protocol

·          VTP sends messages between trunked switches to maintain VLANs on these switches in order to properly trunk. ·          VTP is a Cisco proprietary method of managing VLANs between switches and runs across any type of trunking mechanism. ·          VTP messages are exchanged between switches within a common VTP domain. ·          VTP domains must be defined or VTP disabled before a VLAN can be created. ·          Exchanges of VTP information can be controlled by passwords. ·          VTP manages only VLANs 2 through 1002. ·          VTP allows switches to synchronize their VLANs based on a configuration revision number. ·          Switches can operate in one of t...