Exam 22: Internetwork Quality of Service

In times of congestion elastic traffic will continue to supply a high load and inelastic traffic will be crowded off.

With ________ queuing each incoming packet is placed in a queue for its flow and serviced in a round robin fashion,taking one packet from each nonempty queue in turn.

A ________ delays packets as necessary so that the packet stream in a given class does not exceed the traffic rate specified in the profile for that class.

The ________ updates the traffic control database used by the packet scheduler to determine the service provided for packets of each flow.

Traffic on a network or internet can be divided into two broad categories: elastic and inelastic.

The DS specifications refer to the forwarding treatment provided at a router as ________.This must be available at all routers and typically is the only part of DS implemented in interior routers.

Many traffic sources can be defined easily and accurately by a token bucket scheme.

To avoid unnecessary duplication of packets each router must route packets on the basis of both source and multicast destination.

ISA makes use of the following functions to manage congestion and provide QoS transport: admission control,queuing discipline,discard policy and ________.

The main task of the router is forwarding packets.

A drawback to the ________ queuing discipline is that no special treatment is given to packets from flows that are of a higher priority or are more delay sensitive.

RFC 2205 defines ________ which supplies supporting functionality for ISA.

The use of resource reservation can enable routers to decide ahead of time if they can meet the requirement to deliver a multicast transmission to all designated multicast receivers and to reserve the appropriate resources if possible.

Addresses that refer to a group of hosts on one or more networks are referred to as ________.

________ traffic is the type of traffic for which internets were designed.

The ________ determines the order in which queued packets are transmitted and the selection of packets for discard if necessary.

________ traffic is the traditional type of traffic supported on TCP/IP-based internets and can adjust to changes in delay and throughput across an internet and still meet the needs of its applications.

The ________ is designed to provide a simple,easy to implement,low overhead tool to support a range of network services that are differentiated on the basis of performance.

A ________ is a contract between a network provider and a customer that defines specific aspects of the service that is to be provided.

The ________ is intended to provide QoS transport over IP-based internets.