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Cisco network professional's advanced internetworking guide by Patrick J Conlan; Cisco Systems, Inc

By Patrick J Conlan; Cisco Systems, Inc

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Configuring the ports of your switches prevents one of these people from walking into an office, unplugging the phone or host, plugging in a switch, and creating a trunk port. If an attacker or unknowing person were to do this, they could have access to all of the VLANs and the traffic passing across them. The command to configure a port into access mode is switchport mode access. ” Configuring Trunk Links Now that you have configured basic functions on a single switch, such as access ports for the end stations, the VLANs those ports go into, and even a voice VLAN, it is time to figure out how this traffic is going to get from one switch to a different one.

On a dot1q segment, all the trunk ports must be configured with the same native VLAN to operate correctly. Otherwise, you will get a message on your console screen telling you that there is a native VLAN mismatch. Dynamic Trunking Protocol While the recommended method of creating trunk links is to configure them manually, the process can be accomplished dynamically through a protocol called Dynamic Trunking Protocol (DTP). DTP is a Cisco proprietary protocol that runs only on Cisco Catalyst switches.

Now you just have to know where and what you are going to be doing. Let’s look at the setup of the basic functions and implement the features from the case study. indd 43 3/26/09 11:27:13 AM 44 Chapter 2 Switching n Connecting Sales FutureTech has added a new sales group at the Dallas headquarters. The network administrator assigns you the task of installing a new switch block, designated DSW1, to support that group. Both workstation and telephone connections need to be supported. Unnecessary broadcast traffic is to be kept to a minimum.

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