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2010-01-23

ONT Notes – Queuing

Here are some more notes from my studies.  Of course, no one cares about them but me, but it’s my blog.  I’m sure someone will find it useful.  Please help to correct dumbass mistakes. Congestion Speed mismatch – traffic leaves a lower-bandwidth interface than the one it came in on Aggregation problem – lots of […]

2010-01-22

ONT Notes – Classification, Marking, and NBAR

Here’s another set of notes from my ONT studies.  I’m sure someone will find it useful.  Please help to correct dumbass mistakes. Classification is done with traffic desriptors Ingress interface CoS value on ISL or 802.1P frames Source/destination IP address IP Precedence or DSCP value MPLS EXP Application type Layer 3 QoS Type of Service […]

2010-01-20

ONT Notes – Intro to QoS

I’ll try to keep it a little shorter this time. Major issues for converged enterprise networks Available bandwidth: competition among applications Fixes Increase bandwidth: More power! Properly queue based on classification and marking: QoS Compress: cRTP, TCP header compression, etc. Delay: Lead time to get a packet to the destination Types of delay Processing delay: […]

2010-01-10

ONT Notes – VOIP Networks

Here are some of the notes I’ve been taking while reading over the ONT book. I hope it benefits somebody.  Feel free to correct any stupid mistakes as a paraphrase to avoid a lawsuit. There’s way too much info here.  I’ll refine the process a little better for the next topics. Benefits of Packet Telephony […]

2009-12-10

ISCW Down, Three To Go

I took and passed the ISCW test today.  I was super-nervous going into it, which is weird for me, but I finally calmed down after the first few questions.  Here’s my take.  I don’t want to get into any trouble so I’m not going to include very much detail. The testing center wasn’t very good […]