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Key Concepts
501
Figure 259
A Network Setup Showing Three VLANs
Benefits of VLANs
The main benefit of VLANs is that they provide a network segmentation
system that is far more flexible than any traditional network. Using VLANs
also provides you with other benefits:
■
VLANs ease the movement of devices on networks
. With
traditional networks, network administrators spend much of their
time dealing with moves and changes. If users move to a different
subnetwork, the addresses of each end station must be updated
manually. With a VLAN setup, if an end station in VLAN Marketing for
example is moved to a port in another part of the network, and
retains its original subnet membership, you only need to specify that
the new port is in VLAN Marketing. You do not need to carry out any
re-cabling.
■
VLANs provide extra security
. Devices within each VLAN can only
communicate with other devices in the same VLAN. If a device in
VLAN Marketing needs to communicate with devices in VLAN Finance,
the traffic must pass through a routing device or Layer 3 switch.
■
VLANs help to control traffic
. If a bridge port in a traditional LAN
switching device receives a packet with a broadcast, multicast, or
unknown destination address, it forwards the packet to all other
bridge ports. This process is referred to as bridge flooding. As
Summary of Contents for 3C15500 - Network Director - PC
Page 4: ......
Page 34: ......
Page 38: ...34 ABOUT THIS GUIDE ...
Page 50: ...46 CHAPTER 1 GETTING STARTED ...
Page 64: ...60 CHAPTER 2 PRODUCT ACTIVATION ...
Page 213: ...Components 209 Figure 75 Export to Visio Dialog Box ...
Page 220: ...216 CHAPTER 5 WORKING WITH THE MAP Figure 84 Double Clicking on a Router in the Tree ...
Page 264: ...260 CHAPTER 6 VIEWING DEVICE DETAILS Figure 117 Security Tab for a Device ...
Page 276: ...272 CHAPTER 6 VIEWING DEVICE DETAILS ...
Page 322: ...318 CHAPTER 7 MONITORING THE NETWORK ...
Page 385: ...Examples 381 Figure 189 Attach Alerts Dialog Box ...
Page 406: ...402 CHAPTER 9 PERFORMANCE REPORTING ...
Page 431: ...Components 427 History View dialog box Figure 210 History View Dialog Box ...
Page 440: ...436 CHAPTER 10 RMON Host View dialog box Figure 219 Host View Dialog Box ...
Page 476: ...472 CHAPTER 11 CREATING REPORTS ...
Page 502: ...498 CHAPTER 12 CONFIGURING SINGLE DEVICES ...
Page 526: ...522 CHAPTER 13 VLAN MANAGEMENT Figure 272 Options Dialog Box VLANs Tab ...
Page 567: ...Components 563 Figure 305 Selecting the Link to the End Station on the Map ...
Page 626: ...622 CHAPTER 14 BULK CONFIGURATION ...
Page 684: ...680 CHAPTER 16 UPGRADING DEVICE SOFTWARE ...
Page 814: ...810 CHAPTER 19 BACKING UP DEVICE CONFIGURATIONS ...
Page 838: ...834 CHAPTER 20 LIVE UPDATE ...
Page 894: ...890 APPENDIX G ADDING MAC ADDRESS VENDOR TRANSLATIONS ...