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Sabtu, 12 Juli 2008

ccna 3 discovery modul 2

1. What makes it easier for different networking vendors to design software and hardware that will interoperate?

*OSI model
proprietary designs
IP addressing scheme
standard logical topologies
standard physical topologies

2. Refer to the exhibit. Identify the devices labeled A, B, C, and D in the network physical documentation.

A=bridge, B=switch, C=router, D=hub
*A=bridge, B=hub, C=router, D=switch
A=bridge, B=router, C=hub, D=switch
A=hub, B=bridge, C=router, D=switch

3. Refer to the exhibit. Which column shows the correct sequence of OSI model layers?

A
B
C
*D

4. Which two features apply to WAN connections? (Choose two.)

*operate using serial interfaces
make network connection using a hub
limited to operation over small geographic areas
typically operate under local administrative control
*provide lower bandwidth services compared to LANs

5. Which layer of the OSI model provides network services to processes in electronic mail and file transfer programs?

data link
transport
network
*application

6. Which of the following are ways that bandwidth is commonly measured? (Choose three.)

GHzps
*kbps
*Mbps

Nbps
MHzps
*Gbps

7. Which of the following are factors that determine throughput? (Choose two.)

types of passwords used on servers
type of Layer 3 protocol used
*network topology
width of the network cable
*number of users on the network

8. Which term describes the process of adding headers to data as it moves down OSI layers?

division
encoding
separation
segmentation
*encapsulation

9. Which best describes the function of the physical layer?

*Defines the electrical and functional specifications for the link between end systems.
Provides reliable transit of data across a physical link.
Provides connectivity and path selection between two end systems.
Concerned with physical addressing, network topology and media access.

10. Refer to the following list. Choose the correct order of data encapsulation when a device sends information.
segments
bits
packets
data
frames

1 - 3 - 5 - 4 - 2
2 - 1 - 3 - 5 - 4
2 - 4 - 3 - 5 - 1
4 - 3 - 1 - 2 - 5
* 4 - 1 - 3 - 5 - 2
3 - 5 - 1 - 2 - 4

11. The central hub has malfunctioned in the network. As a result, the entire network is down. Which type of physical network topology is implemented?

bus
*star
ring
mesh

12 What is the term used to describe the transport layer protocol data unit?

bits
packets
*segments
frames
data streams

13 Which three features apply to LAN connections? (Choose three.)

operate using serial interfaces
*make network connection using a hub
*limited to operation over small geographic areas
provide part-time connectivity to remote services
*typically operate under local administrative control
provide lower bandwidth services compared to WANs

14 A switch has failed in the network. As a result, only one segment of the network is down. Which type of physical network topology is implemented?

bus
ring
star
*extended star

15 Which layer of the OSI model provides connectivity and path selection between two end systems where routing occurs?

physical layer
data link layer
*network layer
transport layer

16 What is one advantage of defining network communication by the seven layers of the OSI model?

It increases the bandwidth of a network.
*It makes networking easier to learn and understand.
It eliminates many protocol restrictions.
It increases the throughput of a network.
It reduces the need for testing network connectivity.

17 Which of the following are layers of the TCP/IP model? (Choose three.)

*Application
Physical
*Internet
*Network Access
Presentation

18 Which of the following are data link layer encapsulation details? (Choose two.)

*A header and trailer are added.
Data is converted into packets.
*Packets are packaged into frames.
Frames are divided into segments.
Packets are changed into bits for Internet travel.

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