Networking 101 for Security Professionals

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Networking 101for Security Professionals

• Ernie Bose
• Cisco Systems
• ebose_at_cisco.com

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Hubs and switches

• Whats the difference?

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Hubs
10 or 100 Mbps HDX
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HUB Considerations

• Half Duplex (shared bandwidth)
• Collision domain
• Stacked hubs increase likelihood of collisions
• Bandwidth
• No VLAN capability at hub level
• Wireless (802.11a) is shared bandwidth

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Switches
Processor
Memory
High Speed Backbone
Input/Output Buffers
10/100/1000 Mbps FDX/HDX Auto Negotiate
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Switch Considerations

• Full Duplex (dedicated bandwidth)
• No Collision domain
• Each port has full bandwidth available
• No collisions
• Multiple VLAN capability
• VLAN per application
• Greater security
• Bandwidth restricted at uplinks

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Low Cost (Cheap) Switches
Processor
Memory
100 Mbps Bus
Switch
10 Mbps Bus
10/100 Selector
10/100 Mbps Auto Negotiate
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VLANs
Virtual LANs
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VLANs
Virtual LANs
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Cisco in security

• Seal Beach Police Department

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