[Free] 2017(July) EnsurePass Examcollection Cisco 200-125 Dumps with VCE and PDF 11-20

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 11 – (Topic 1)

Refer to the graphic.


Host A is communicating with the server. What will be the source MAC address of the frames received by Host A from the server?

  1. the MAC address of router interface e0

  2. the MAC address of router interface e1

  3. the MAC address of the server network interface

  4. the MAC address of host A

    Answer: A Explanation:

    Whereas switches can only examine and forward packets based on the contents of the MAC header, routers can look further into the packet to discover the network for which a packet is destined. Routers make forwarding decisions based on the packet#39;s network- layer header (such as an IPX header or IP header). These network-layer headers contain source and destination network addresses. Local devices address packets to the router#39;s MAC address in the MAC header. After receiving the packets, the router must perform the following steps:

    1. Check the incoming packet for corruption, and remove the MAC header. The router checks the packet for MAC-layer errors. The router then strips off the MAC header and examines the network-layer header to determine what to do with the packet.

    2. Examine the age of the packet. The router must ensure that the packet has not come too far to be forwarded. For example, IPX headers contain a hop count. By default, 15 hops is the maximum number of hops (or routers) that a packet can cross. If a packet has a hop count of 15, the router discards the packet. IP headers contain a Time to Live (TTL) value.

      Unlike the IPX hop count, which increments as the packet is forwarded through each router, the IP TTL value decrements as the IP packet is forwarded through each router. If an IP packet has a TTL value of 1, the router discards the packet. A router cannot decrement the TTL value to 1 and then forward the packet.

    3. Determine the route to the destination. Routers maintain a routing table that lists available networks, the direction to the desired network (the outgoing interface number), and the distance to those networks. After determining which direction to forward the packet, the router must build a new header. (If you want to read the IP routing tables on a Windows 95/98 workstation, type ROUTE PRINT in the DOS box.)

    4. Build the new MAC header and forward the packet. Finally, the router builds a new MAC header for the packet. The MAC header includes the router#39;s MAC address and the final destination#39;s MAC address or the MAC address of the next router in the path.

      Question No: 12 – (Topic 1)

      Refer to exhibit:


      Which two destination addresses will be used by Host A to send data to Host C? (Choose two.)

      1. the IP address of Switch 1

      2. the MAC address of Switch 1

      3. the IP address of Host C

      4. the MAC address of Host C

      5. the IP address of the router#39;s E0 interface

      6. the MAC address of the router#39;s E0 interface

Answer: C,F Explanation:

While transferring data through many different networks, the source and destination IP addresses are not changed. Only the source and destination MAC addresses are changed. So in this case Host A will use the IP address of Host C and the MAC address of E0 interface to send data. When the router receives this data, it replaces the source MAC address with its own E1 interface’s MAC address and replaces the destination MAC address with Host C’s MAC address before sending to Host C.

Question No: 13 – (Topic 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?

  1. session

  2. transport

  3. network

  4. data link

  5. 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.

Question No: 14 DRAG DROP – (Topic 1)

Drag the cable type on the left to the purpose for which it is best suited on the right. (Not all options are used.)






To remember which type of cable you should use, follow these tips:

  • To connect two serial interfaces of 2 routers we use serial cable

    鈥?To specify when we use crossover cable or straight-through cable, we should remember:

    Group 1: Router, Host, Server

    Group 2: Hub, Switch

    One device in group 1 One device in group 2: use straight-through cable

    Two devices in the same group: use crossover cable

    For example: we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server… and we use crossover cable to connect switch to switch, switch to hub, router to router, host to host…)

    Question No: 15 – (Topic 1)

    For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

    1. to uniquely identify devices at Layer 2

    2. to allow communication with devices on a different network

    3. to differentiate a Layer 2 frame from a Layer 3 packet

    4. to establish a priority system to determine which device gets to transmit first

    5. to allow communication between different devices on the same network

    6. 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) -gt; B is not correct.

    Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical address -gt;.

    On Ethernet, each frame has the same priority to transmit by default -gt;.

    All devices need a physical address to identify itself. If not, they cannot communicate -gt;.

    Question No: 16 – (Topic 1)

    Which of the following describes the roles of devices in a WAN? (Choose three.)

    1. A CSU/DSU terminates a digital local loop.

    2. A modem terminates a digital local loop.

    3. A CSU/DSU terminates an analog local loop.

    4. A modem terminates an analog local loop.

    5. A router is commonly considered a DTE device.

    6. A router is commonly considered a DCE device.

    Answer: A,D,E Explanation:

    The idea behind a WAN is to be able to connect two DTE networks together through a DCE network. The network’s DCE device (includes CSU/DSU) provides clocking to the DTE- connected interface (the router’s serial interface).


    A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device. A CSU/DSU is used between two digital lines –

    For more explanation of answer D, in telephony the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the carrier or telecommunications service provider’s network. Therefore a modem terminates an analog local loop is correct.


    Question No: 17 – (Topic 1)

    Refer to the exhibit:


    What will Router1 do when it receives the data frame shown? (Choose three.)

    1. Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965.

    2. Router1 will strip off the source IP address and replace it with the IP address

    3. Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.

    4. Router1 will strip off the destination IP address and replace it with the IP address of

    5. Router1 will forward the data packet out interface FastEthernet0/1.

    6. Router1 will forward the data packet out interface FastEthernet0/2.

    Answer: A,C,F Explanation:

    Remember, the source and destination MAC changes as each router hop along with the TTL being decremented but the source and destination IP address remain the same from source to destination.

    Question No: 18 – (Topic 1)

    A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?

    1. This is a 10 Mb/s switch port.

    2. This is a 100 Mb/s switch port.

    3. This is an Ethernet port operating at half duplex.

    4. This is an Ethernet port operating at full duplex.

    5. This is a port on a network interface card in a PC.

    Answer: C Explanation:

    Modern Ethernet networks built with switches and full-duplex connections no longer utilize CSMA/CD. CSMA/CD is only used in obsolete shared media Ethernet (which uses repeater or hub).

    Question No: 19 – (Topic 1)

    A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the network administrator is using for this operation?

    1. application

    2. presentation

    3. session

    4. transport

    5. internet

    6. data link

    Answer: A Explanation:

    FTP belongs to Application layer and it is also the highest layer of the OSI model.

    Question No: 20 DRAG DROP – (Topic 1)

    Refer to the exhibit. Complete this network diagram by dragging the correct device name or description to the correct location. Not all the names or descriptions will be used.




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