受験者が642-887の受験目的は転職ですか？
642-887は程度の知識が必要な中級者向け試験です。
642-887試験の対応資格はCCNP Service Providerです。
現時点で有効な CCIP 認定を保有している方は、CCNP Service Provider 認定の取得をお勧めします。
642-887認定試験のために最善の準備をしなかった場合、それが簡単に取ることができますか？
PassexamのCCNP Service Provider
642-887問題集を使用すると、QOS関連とMPLSのタグ関連理解することができます。
弊社のCCNP Service Provider 642-887勉強資料で予習していれば余裕だと思います。
642-887認定試験情報：
642-887試験合格は次のいずれかの条件を満たす必要があります。
有効な CCNA Service Provider 認定
有効な CCIP 認定
いずれかの CCIE 認定
試験名称：Implementing Cisco Service Provider Next-Generation Core Network Services
関連資格：CCNP Service Provider
合格点： 700点
問題数： 75
出題形式：単一選択,複数選択,リスト選択(単一),リスト選択(複数),ドラッグ＆ドロップ
試験時間：90+30
試験言語：英語
642-887 SPCORE試験では、MPLS テクノロジーおよび MPLS-TE サービスの概念と実装に関する知識を確認します。
642-887認定試験の情報が役立つことができるようになります。
最高の品質のCCNP Service Provider 642-887受験対策を与えることができます。
CCNP Service Provider 642-887試験教材を使用すると、試験のためのより良い準備を取ることができます。
1.Which three conditions can occur when metering traffic using a dual token bucket traffic policing QoS
mechanism on Cisco routers? (Choose three.)
A. conform
B. pass
C. violate
D. exceed
E. burst
F. matched
Answer: A,C,D
2.What is the correct formula for determining the CIR?
A. CIR = Bc/Tc
B. CIR = Bc x Tc C. CIR = Tc/Bc
D. CIR = Bc + Be
E. CIR = Tc/(Bc+Be)
F. CIR = (Bc+Be)/Tc
Answer: A
Explanation:
Committed Information Rate (CIR) – the rate the device will send at (on average) over a one second
period.
The default CIR when traffic-shaping is enabled on the interface is 56K. CIR is also referred to as the
“target rate”. Since the device is forced to send at the AR, it does not send all of the time (within one
second) ? in order to send an average amount of data that equals the CIR. Minimum CIR (mincir) – the
rate the service provider guarantees to accept. Theoretically, the provider will set the DE bit for all traffic
above this rate. Mincir is designed to be used in conjunction with adaptive shaping. With adaptive shaping,
the router will throttle down in the event of congestion. The router will not throttle down below this value.
Committed Burst (Bc) – the number of committed bits allows to be sent during a given interval. The device
sends an average amount of traffic to achieve the CIR. The Bc value defaults to 1/8 of the configured CIR
for speeds below 650K. For speeds above that, it is roughly 1/16 of CIR. Excess Burst (Be) – the number
of non-committed bits the router is allowed to send above Bc during the first interval (Tc). The amount of
Be “credits” is derived from unused Bc credits in previous intervals. There is no limit to how long Be can
“store” unused Bc credits. It is a common misconception that Be can only store credits from the previous
interval or the previous second. There is no default Be value.
Committed Rate Measurement Interval (Tc) – the time interval over whic Bc or Bc+Be can be transmitted.
The max value is 125 ms and the minimum value is 10 ms.
The Formula
CIR, Tc, and Bc are related mathematically by the following formula:
CIR = Bc/(Tc/1000) Notice the division of Tc by 1000 is used to convert milliseconds into seconds – the
common measurement of CIR and Bc.
3.DS-TE implementations on Cisco routers support which bandwidth pool(s) and class type(s)? (Choose
two.)
A. global pool only
B. subpool only
C. global pool and subpool
D. class-type 0 only
E. class-type 1 only
F. class-type 0 and class-type 1
Answer: C,F
Explanation:
Differential Service Tunnels
Differential Service Traffic Engineering (TE) is an extension of the regular MPLS Traffic Engineering
(MPLSTE) feature. Regular TE does not provide bandwidth guarantees to different traffic classes. A single
bandwidth pool (global pool) is used in regular TE that is shared by all traffic. In order to support various
class of service (CoS), the ability to provide multiple bandwidth pools is required. These bandwidth pools
then can be treated differently based on the requirement for the traffic class using that pool.
In RSVP global and subpools reservable bandwidths are configured on a per interface basis to
accommodate TE tunnels on the node. Available bandwidth from all configured bandwidth pools is
advertised using Interior Gateway Protocol (IGP). RSVP is used to signal the TE tunnel with appropriate
bandwidth pool requirements.
