CCENT はネットワーキング キャリアのドアを開きます。
CCENT 認定保有者は、小規模エンタープライズ ブランチ ネットワークを管理する能力を持っていることを証明できます。
1. Topic 1: Network Fundamentals
Which three statements are true about the operation of a full-duplex Ethernet network? (Choose three.)
A. There are no collisions in full-duplex mode.
B. A dedicated switch port is required for each full-duplex node.
C. Ethernet hub ports are preconfigured for full-duplex mode.
D. In a full-duplex environment, the host network card must check for the availability of the network media
before transmitting.
E. The host network card and the switch port must be capable of operating in full-duplex mode.
Answer: A, B, E
Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair
with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help
prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it
must operate in half-duplex mode because the end stations must be able to detect collisions. Half-duplex
Ethernet—typically 10BaseT—is only about 30 to 40 percent efficient as Cisco sees it, because a large
10BaseT network will usually only give you 3- to 4Mbps—at most.
Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex
uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the
receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared
to half duplex. And because the transmitted data is sent on a different set of wires than the received data,
no collisions occur. The reason you don’t need to worry about collisions is because now Full-duplex
Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex.
Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get
20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet.

2.Which OSI layer header contains the address of a destination host that is on another network?
A. application
B. session
C. transport
D. network
E. data link
F. physical
Answer: D
Only network address contains this information. To transmit the packets the sender uses network address
and datalink address. But the layer 2 address represents just the address of the next hop device on the
way to the sender. It is changed on each hop. Network address remains the same.

試験番号:100-105 ICND1
試験名称:Interconnecting Cisco Networking Devices Part 1
関連資格:CCENT, CCNA Routing & Switching, CCDA, CCNA Security, CCNA Wireless
試験時間:90 分 (45 – 55 問)

CCENT資格100-105試験では、ネットワークの基礎、LAN スイッチング テクノロジー、ルーティング テクノロジー、インフラストラクチャ サービス、インフラストラクチャのメンテナンスに関する受験者の知識とスキルが問われます。