Normal data Normal data traf?¬?c is typical application traf?¬?c that is related to ?¬?le and print
services, e-mail, Internet browsing, database access, and other shared
network applications. This data will need to be treated in either the same
ways or different ways in different parts of the network, depending on the
volume of each type. Examples of this type of traf?¬?c are SMB6, NCP7,
SMTP8, SQL9, and HTTP.
Scavenger
class
Scavenger class includes all traf?¬?c with protocols or patterns that exceed
their normal data ?¬‚ows. This type of traf?¬?c is used to protect the network
from exceptional traf?¬?c ?¬‚ows that may be the result of malicious programs
executing on end-system PCs. Scavenger class is also used for ???less than
best effort??? traf?¬?c, such as peer-to-peer traf?¬?c.
22 Chapter 2: Medium-Sized Switched Network Construction
Voice VLAN Essentials
Some Cisco Catalyst switches offer a unique feature called a voice VLAN, which lets you
overlay a voice topology onto a data network. You can segment phones into separate logical
networks, even though the data and voice infrastructure are physically the same, as
illustrated in Figure 2-5.
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