When you see packets that look like this, do prioritize or do delay.
Any application will use 100% of the available bandwidth, we want to set the network to identify traffic flow and rate limited to this particular speed or maybe accelerated and cut the line in front of other packets.
Marking
Classify bases on an ACL or other conditions
Sometimes called Coloring
Add the type of Service marking on Layer 3 on the IP header.
Classification is the identification process, the marking process is were we go in and we add the Type of Service (ToS)
Expedited Forwarding
VoIP - We usually want great audio quality in a call, go ahead and perform expedited forwarding
Create a Voice VLAN for segregation of voice data, ensuring QoS.
When you are busy, these are the packets that go first
Delays
In times of congestion throw away certain applications but always deliver others
Dropping
TCP Global Synchronization
All are speeding up at the same time and dropping at the same time, this is bad
When hitting 100% they will all fall off
This is oscillation and is very inefficient since there is a lot of bandwidth unused when a drop happens.
A file transfer starts very slow but it speeds up
Network Quality Conditions
Latency: delay in communication
Jitter: variation in latency
PacketLoss: data that was not successfully transferred
Throughput: rate that data can be transferred
Mission-critical Data
What matters to the customer?
Every organization has different needs
We tend to see desired from clients to have a lot of share links from a couple components
Applications
What is the level of importance
IP / Subnets / Ports
Start to create rules that guarantee a certain level of performance
Backups
Can be very large
typically not latency sensitive
We want to make sure that it occurs in less activity hours
Virtual desktop
Loads a client that remotes logs you into a virtual desktop (A computer running somewhere else)