シスコのサイトによって、CCNA Routing and Switchingの改訂を発表しました。
CCNA Routing and Switching認定を取得したかったら、どのように対応すればよいでしょうか。
2016年8月21日に以降に、CCNA Routing and Switching認定のためには、200-125試験に合格する必要がございます。
CCNA Routing and Switching認定200-125試験を受けるにあたり、Testpassportを勉強することを推奨します。
TestpassportのCCNA Routing and Switching認定200-125問題集は良い準備と完全な知識構造を持っている必要があります。
最新のCCNA Routing and Switching認定200-125トレーニング資料を提供しています。
弊社の200-125勉強資料を利用してから、試験に受かりました。

200-125試験概要：
試験番号：200-125 CCNA
試験名称：Cisco Certified Network Associate
関連資格：Cisco CCNA Routing and Switching
試験時間：90 分
試験数：50 – 60 問
試験言語：英語
200-125認定試験は基盤となるテクノロジーの知識を習得するだけでなく、次世代テクノロジーに必要なスキルセットに備えます。

200-125出題範囲：
1.0   ネットワークの基礎　　15%
2.0   LAN スイッチング テクノロジー　　21%
3.0   ルーティング テクノロジー　　23%
4.0   WAN テクノロジー　　10%
5.0   インフラストラクチャ サービス　　10%
6.0   インフラストラクチャ セキュリティ　　11%
7.0   インフラストラクチャの管理　　10%

最新の200-125トレーニング教材を使用すると、完全な試験準備を行うことができます。
弊社のCCNA Routing and Switching認定200-125学習資料は一番高品質で低価額で、試験の問題が絶えず切れない更新でテストの内容ともっとも真実と近づいてお客様の合格が保証いたします。
Testpassportは200-125（Cisco Certified Network Associate）試験に良いの準備と自信がとても必要だと思います。
以下は部分の200-125問題、答えと解説です。
1.A receiving host computes the checksum on a frame and determines that the frame is damaged. The
frame is then discarded. At which OSI layer did this happen?
A. session
B. transport
C. network
D. data link
E. physical
Answer: D
Explanation:
The Data Link layer provides the physical transmission of the data and handles error notification, network
topology, and flow control. The Data Link layer formats the message into pieces, each called a data frame,
and adds a customized header containing the hardware destination and source address. Protocols Data
Unit (PDU) on Datalink layer is called frame. According to this question the frame is damaged and
discarded which will happen at the Data Link layer.
4.For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)
A. to uniquely identify devices at Layer 2
B. to allow communication with devices on a different network
C. to differentiate a Layer 2 frame from a Layer 3 packet
D. to establish a priority system to determine which device gets to transmit first
E. to allow communication between different devices on the same network
F. to allow detection of a remote device when its physical address is unknown
Answer: A,E
Explanation:
Physical addresses or MAC addresses are used to identify devices at layer 2.
MAC addresses are only used to communicate on the same network. To communicate on different
network we have to use Layer 3 addresses (IP addresses) -> B is not correct.
Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical
address ->.
On Ethernet, each frame has the same priority to transmit by default ->. All devices need a physical
address to identify itself. If not, they cannot communicate ->.

2.Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two.)
A. The transport layer divides a data stream into segments and may add reliability and flow control
information.
B. The data link layer adds physical source and destination addresses and an FCS to the segment.
C. Packets are created when the network layer encapsulates a frame with source and destination host
addresses and protocol-related control information.
D. Packets are created when the network layer adds Layer 3 addresses and control information to a
segment.
E. The presentation layer translates bits into voltages for transmission across the physical link.
Answer: A,D
Explanation:
The transport layer segments data into smaller pieces for transport. Each segment is assigned a
sequence number, so that the receiving device can reassemble the data on arrival.
The transport layer also use flow control to maximize the transfer rate while minimizing the requirements
to retransmit. For example, in TCP, basic flow control is implemented by acknowledgment by the receiver
of the receipt of data; the sender waits for this acknowledgment before sending the next part.
The Network layer (Layer 3) has two key responsibilities. First, this layer controls the logical addressing of
devices. Second, the network layer determines the best path to a particular destination network, and
routes the data appropriately.