CCNA 1 Chapter 4 V6.0 Answers

1. Refer to the exhibit. What is wrong with the displayed termination?

The wires are too thick for the connector that is used.

The untwisted length of each wire is too long.

The woven copper braid should not have been removed.

The wrong type of connector is being used.

 

2. Why are two strands of fiber used for a single fiber optic connection?

They prevent crosstalk from causing interference on the connection.

They increase the speed at which the data can travel.

The two strands allow the data to travel for longer distances without degrading.

They allow for full-duplex connectivity.

 

3. Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit?

All three networks use CSMA/CA

Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.

Network 1 uses CSMA/CA and Network 2 uses CSMA/CD.

Network 2 uses CSMA/CA and Network 3 uses CSMA/CD.

None of the networks require media access control.

 

4. Fill in the blank.

A physical topology that is a variation or combination of a point-to-point, hub and spoke, or mesh topology is commonly known as a _hybrid_ topology.

 

5. Which method of data transfer allows information to be sent and received at the same time?

full duplex

simplex

multiplex

half duplex

 

6. What is one advantage of using fiber optic cabling rather than copper cabling?

It is able to be installed around sharp bends.

It is usually cheaper than copper cabling.

It is able to carry signals much farther than copper cabling.

It is easier to terminate and install than copper cabling.

 

7. Match the characteristics to the correct type of fiber. (Not all options are used.)

- Multimode Fiber

LED as light source

several paths of light into the fiber

generally used with LANs

- Single-mode Fiber

only one ray of light into the fiber

generally used for campus backbone

laser as light source

 

8. What is contained in the trailer of a data-link frame?

Logical address

data

physical address

error detection

 

9. What are two services performed by the data link layer of the OSI model? (Choose two.)

It accepts Layer 3 packets and encapsulates them into frames.

It determines the path to forward packets.

It encrypts data packets.

It monitors the Layer 2 communication by building a MAC address table.

It provides media access control and performs error detection.

 

10. Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?

1 – rollover, 2 – crossover, 3 – straight-through

1 – crossover, 2 – rollover, 3 – straight-through

1 – rollover, 2 – straight-through, 3 – crossover

1 – crossover, 2 – straight-through, 3 – rollover

 

11. Which type of connector does a network interface card use?

PS-2

DIN

RJ-11

RJ-45

 

12. A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.)

interference

packet collision

security

mobility options

coverage area

extensive cabling

 

13. What is indicated by the term throughput?

the measure of the usable data transferred across the media

the measure of the bits transferred across the media over a given period of time

the time it takes for a message to get from sender to receiver

the capacity of a particular medium to carry data

the guaranteed data transfer rate offered by an ISP

 

14. What is the function of the CRC value that is found in the FCS field of a frame?

To compute the checksum header for the data field in the frame

to verify the logical address in the frame

to verify the physical address in the frame

to verify the integrity of the received frame

 

15. What technique is used with UTP cable to help protect against signal interference from crosstalk?

wrapping a foil shield around the wire pairs

twisting the wires together into pairs

terminating the cable with special grounded connectors

encasing the cables within a flexible plastic sheath

 

16. Which characteristic describes crosstalk?

the distortion of the transmitted messages from signals carried in adjacent wires

the loss of wireless signal over excessive distance from the access point

the weakening of the network signal over long cable lengths

the distortion of the network signal from fluorescent lighting

 

17. As data travels on the media in a stream of 1s and 0s how does a receiving node identify the beginning and end of a frame?

The transmitting node inserts start and stop bits into the frame.

The receiving node identifies the beginning of a frame by seeing a physical address.

The transmitting node sends a beacon to notify that a data frame is attached.

The transmitting node sends an out-of-band signal to the receiver about the beginning of the frame.

 

18. A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)

extended length of cabling

signal attenuation

RFI

EMI

crosstalk

 

19. What is true concerning physical and logical topologies?

Physical topologies are concerned with how a network transfers frames.

Physical topologies display the IP addressing scheme of each network.

The logical topology is always the same as the physical topology.

Logical topologies refer to how a network transfers data between devices.

 

20. Which statement describes an extended star topology?

End devices are connected together by a bus and each bus connects to a central intermediate device.

All end and intermediate devices are connected in a chain to each other.

End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.

Each end system is connected to its respective neighbor via an intermediate device.

 

21. Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

data link

physical

transport

application

 

22. Fill in the blank.

The term _bandwidth_ indicates the capacity of a medium to carry data and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).

 

23. What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)

to identify where the frame starts and ends

to reduce the number of collisions on the media

to provide better media error correction

to increase the media throughput

to distinguish data bits from control bits

 

24. Fill in the blank.

What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame? LLC