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Cisco CCNA 200-125 Exam - CCNA Cisco Certified Network Associate

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Questions & Answers for Cisco 200-125

Showing 1-15 of 401 Questions

Question #1 - Topic 1

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

A. application

B. internet

C. network

D. transport

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

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Question #2 - Topic 1

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

A. There are two broadcast domains in the network.

B. There are four broadcast domains in the network.

C. There are six broadcast domains in the network.

D. There are four collision domains in the network.

E. There are five collision domains in the network.

F. There are seven collision domains in the network.

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 ->.
Both router and switch can break up collision domains so there is only 1 collision domain
on the left of the router (because hub doesnt 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) ->.

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Question #3 - 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?

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

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

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

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

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

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).

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Question #4 - Topic 1

Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down.

Which of the following are true? (Choose two.)

A. Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.

B. Router C will use ICMP to inform Router B that Host 2 cannot be reached.

C. Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.

D. Router C will send a Destination Unreachable message type.

E. Router C will send a Router Selection message type.

F. Router C will send a Source Quench message type.

Explanation:
Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Router
C will send ICMP packets to inform Host 1 that Host 2 cannot be reached.

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Question #5 - Topic 1

Refer to the exhibit.

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

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

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

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

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

E. Switch C, because it has the lowest priority

F. Switch D, because it has the highest priority

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.

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Question #6 - 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?

A. transport

B. network

C. presentation

D. session

E. application

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.

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Question #7 - 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?

A. the MAC address of router interface e0

B. the MAC address of router interface e1

C. the MAC address of the server network interface

D. the MAC address of host 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'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'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 MA

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Question #8 - 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?

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

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

C. Add two more Fast Ethernet interfaces.

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

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

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Question #9 - Topic 1

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

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Question #10 - 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?

A. application

B. presentation

C. session

D. transport

E. internet

F. data link

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

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Question #11 - 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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Question #12 - 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?

A. session

B. transport

C. network

D. data link

E. physical

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.

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Question #13 - Topic 1

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.

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.

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Question #14 - Topic 1

Refer to exhibit:

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

A. the IP address of Switch 1

B. the MAC address of Switch 1

C. the IP address of Host C

D. the MAC address of Host C

E. the IP address of the router's E0 interface

F. the MAC address of the router's E0 interface

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 interfaces MAC address and replaces the destination MAC
address with Host Cs MAC address before sending to Host C.

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Question #15 - Topic 1

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

A. 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.

B. 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.

C. 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.

D. 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.

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.

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