网络工程师英语系列2(CISCO IP Telephony)

赵小黑

if you follow the Cisco exam topic "guidelines," you should have a good understanding of the breadth and depth of topics . the exam.在广度和深度方面对考试有更好的理解　　people working toward CCIE考CCIE的人 can still have the materials available
　　Used in conjunction with跟....配合使用 mls qos trust device cisco-phone,
　　Use the mlq qos cos override command . interface Fast Ethernet 0/10 to overwrite重写 the CoS value of 1 with the configured CoS value of 2. This command overrides覆盖 any trust state of the interface, CoS or DSCP, and places the configured default CoS value of 2 in every frame.
　　It is important to understand the capabilities of the Ethernet modules in your Catalyst to properly provision your network for the addition of real-time applications在增加适时程序的情况正确规划网络
　　This up-front在前面 planning can result in the perceived success or failure of your project in the eyes of the end users.

　　So how much delay should a packet experience in the cloud? Well, it will vary. The carrier might commit to a maximum delay value as well. However, with a little insight, you can get a solid understanding of the minimum delay a packet should experience through a Frame>
　　This example uses contrived numbers to make the>　　If the offered load . the network consistently exceeds the bandwidth假如网络负载持续超过物理带宽 or clock rate of the link the traffic must flow across, unpredictable behavior can result.

　　Whether WFQ uses the ToS byte or not when>　　Most delay components in LAN switches are small enough not to matter在LAN交换机上的延迟组件小得可以忽略不计
　　With each flow receiving its fair share of the link bandwidth, the lower-volume flows prosper小流量的数据流就很爽,而大流量的就很受憋, and the higher-volume flows suffer.
　　If there is no congestion . the router or switch for that period in time, congestion management does not come into play.如果交换机在那个时间参考点没有发生拥塞,拥塞管理就不起作用
　　If too many packets exist in the LLQ, the benefits of QoS are negated,如果LLQ上报文太多,QOS的好处就会打折扣
　　Notice that the SLA agreement is instrumental有帮助的 in each QoS component required. This is because the SLA provides the roadmap路标 that will be used for all traffic that traverses the service provider's network. From this roadmap, QoS configuration for the CE router can be developed. 应运而生
　　With the SLA and network topology in place, you can begin to build the required QoS configurations.一旦SLA和网络拓扑到位,你就可以开始创建所需的QOS配置了

　　An SLA is a contractual agreement合同 that stipulates规定 how each defined>
　　As a rule of thumb, WRED performs more effectively when applied to a CBWFQ that services TCP applications,根据经验,WRED用在服务于TCP应用程序的CBWFQ队列时表现更佳 because these applications have the capability to retransmit lost packets. Some>
　　Unlike>　　note: the next output lines describes the police command, which
　　! wraps around to折行 a second line.
　　Portions omitted for Brevity为了简洁一些,部分内容省略了