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i,<br />
&nbsp; &nbsp;I have just started studying cisco qos and just want to make sure i am understanding correctly dscp,ip precendence and queing methods. SO we mark traffic with whichever method cos,dscp,ip prec. These relate to priority so for example <br />
ip precendence &nbsp;5 is this top priority traffic like voice. When this traffic comes in marked to the router interfaces for quieing the router interface needs to support a priority queing method to use these markings??. <br />
<br />
So for example if i am using fifo as my quieing no matter if 2 packets arrive 1 with ip precedence of 3 and another with ip precedence of 5 that it will be down to whichever arrived first so this quieing method is not ip precedence/dscp/cos aware and will not take into account these marking. So there is no point in using these markings unless you use queing that is aware of priority like low latency queing.<br />
<br />
Is this correct or am i missing something.<br />
<br />
Thks<br />
<br />
Eoghan 
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i,
   I have just started studying cisco qos and just want to make sure i am understanding correctly dscp,ip precendence and queing methods. SO we mark traffic with whichever method cos,dscp,ip prec. These relate to priority so for example 
ip precendence  5 is this top priority traffic like voice. When this traffic comes in marked to the router interfaces for quieing the router interface needs to support a priority queing method to use these markings??. 

So for example if i am using fifo as my quieing no matter if 2 packets arrive 1 with ip precedence of 3 and another with ip precedence of 5 that it will be down to whichever arrived first so this quieing method is not ip precedence/dscp/cos aware and will not take into account these marking. So there is no point in using these markings unless you use queing that is aware of priority like low latency queing.

Is this correct or am i missing something.

Thks

Eoghan 

Cisco Qos IP PREC/DSCP and Queing methods FIFO

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

Network Architecture

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.