[Free] 2017(July) EnsurePass Examcollection Cisco 200-125 Dumps with VCE and PDF 1-10

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 1 – (Topic 1)

What is the difference between a CSU/DSU and a modem?

  1. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.

  2. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.

  3. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.

  4. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.

Answer: D Explanation:

CSU/DSU is used to convert digital signals from a router to a network circuit such as a T1, while a modem is used to convert digital signals over a regular POTS line.

Question No: 2 – (Topic 1)

Which three statements accurately describe Layer 2 Ethernet switches? (Choose three.)

  1. Spanning Tree Protocol allows switches to automatically share VLAN information.

  2. Establishing VLANs increases the number of broadcast domains.

  3. Switches that are configured with VLANs make forwarding decisions based on both Layer 2 and Layer 3 address information.

  4. Microsegmentation decreases the number of collisions on the network.

  5. In a properly functioning network with redundant switched paths, each switched segment will contain one root bridge with all its ports in the forwarding state. All other switches in that broadcast domain will have only one root port.

  6. If a switch receives a frame for an unknown destination, it uses ARP to resolve the address.

Answer: B,D,E Explanation:

Microsegmentation is a network design (functionality) where each workstation or device on a network gets its own dedicated segment (collision domain) to the switch. Each network device gets the full bandwidth of the segment and does not have to share the segment with other devices. Microsegmentation reduces and can even eliminate collisions because each segment is its own collision domain -gt;.

Note: Microsegmentation decreases the number of collisions but it increases the number of collision domains.

Question No: 3 – (Topic 1)

Refer to the exhibit.

image

Based on the information given, which switch will be elected root bridge and why?

  1. Switch A, because it has the lowest MAC address

  2. Switch A, because it is the most centrally located switch

  3. Switch B, because it has the highest MAC address

  4. Switch C, because it is the most centrally located switch

  5. Switch C, because it has the lowest priority

  6. Switch D, because it has the highest priority

Answer: E Explanation:

To elect the root bridge in the LAN, first check the priority value. The switch having the lowest priority will win the election process. If Priority Value is the same then it checks the MAC Address; the switch having the lowest MAC Address will become the root bridge. In

this case, switch C has the lowest MAC Address so it becomes the root bridge.

Question No: 4 – (Topic 1)

A router has two Fast Ethernet interfaces and needs to connect to four VLANs in the local network. How can you accomplish this task, using the fewest physical interfaces and without decreasing network performance?

  1. Use a hub to connect the four VLANS with a Fast Ethernet interface on the router.

  2. Add a second router to handle the VLAN traffic.

  3. Add two more Fast Ethernet interfaces.

  4. Implement a router-on-a-stick configuration.

Answer: D Explanation:

A router on a stick allows you to use sub-interfaces to create multiple logical networks on a single physical interface.

Question No: 5 – (Topic 1)

Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two.)

  1. The transport layer divides a data stream into segments and may add reliability and flow control information.

  2. The data link layer adds physical source and destination addresses and an FCS to the segment.

  3. Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.

  4. Packets are created when the network layer adds Layer 3 addresses and control information to a segment.

  5. 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.

Question No: 6 DRAG DROP – (Topic 1)

Refer to the exhibit. PC_1 is exchanging packets with the FTP server. Consider the packets as they leave RouterB interface Fa0/1 towards RouterA. Drag the correct frame and packet addresses to their place in the table.

image

Answer:

image

Explanation:

Source Mac AddressDestination Mac AddressSource IP addressDestination MAC address MAC 0000.0c89.3333MAC 0000.0c89.9999 IP 172.16.34.250IP 172.16.21.7

Question No: 7 – (Topic 1)

Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

  1. transport

  2. network

  3. presentation

  4. session

  5. application

Answer: E Explanation:

This question is to examine the OSI reference model.

The Application layer is responsible for identifying and establishing the availability of the intended communication partner and determining whether sufficient resources for the intended communication exist.

Question No: 8 DRAG DROP – (Topic 1)

Match the terms on the left with the appropriate OSI layer on the right. (Not all options are used.)

image

Answer:

image

Question No: 9 – (Topic 1)

Where does routing occur within the DoD TCP/IP reference model?

  1. application

  2. internet

  3. network

  4. transport

Answer: B Explanation:

The picture below shows the comparison between TCP/IP model amp; OSI model. Notice that the Internet Layer of TCP/IP is equivalent to the Network Layer which is responsible for routing decision.

image

Question No: 10 – (Topic 1)

Which of the following statements describe the network shown in the graphic? (Choose two.)

image

  1. There are two broadcast domains in the network.

  2. There are four broadcast domains in the network.

  3. There are six broadcast domains in the network.

  4. There are four collision domains in the network.

  5. There are five collision domains in the network.

  6. There are seven collision domains in the network.

Answer: A,F Explanation:

Only router can break up broadcast domains so in the exhibit there are 2 broadcast domains: from e0 interface to the left is a broadcast domain and from e1 interface to the right is another broadcast domain -gt;.

Both router and switch can break up collision domains so there is only 1 collision domain on the left of the router (because hub doesn’t break up collision domain) and there are 6 collision domains on the right of the router (1 collision domain from e1 interface to the switch 5 collision domains for 5 PCs in Production) -gt;.

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