王宝钏当了多久的皇后:谁能帮我做一下题 谢谢大家 呵呵 思科的（全英文）

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

A operate using serial interfaces
B make network connection using a hub
C limited to operation over small geographic areas
D typically operate under local administrative control
E provide lower bandwidth services compared to LANs
5 The central hub has malfunctioned in the network. As a result, the entire network is down. Which type of physical network topology is implemented?
A bus
B star
C ring
D mesh
6 Which layer of the OSI model provides network services to processes in electronic mail and file transfer programs?

A data link
B transport
C network
D application
7 Which term describes the process of adding headers to data as it moves down OSI layers?
A division
B encoding
C separation
D segmentation
E encapsulation
Which best describes the function of the physical layer?

A Defines the electrical and functional specifications for the link between end systems.
B Provides reliable transit of data across a physical link.
C Provides connectivity and path selection between two end systems.
D Concerned with physical addressing, network topology and media access.
9 Refer to the following list. Choose the correct order of data encapsulation when a device sends information.
1 segments
2 bits
3 packets
4 data
5 frame

A 1 - 3 - 5 - 4 - 2
B 2 - 1 - 3 - 5 - 4
C 2 - 4 - 3 - 5 - 1
D 4 - 3 - 1 - 2 - 5
E 4 - 1 - 3 - 5 - 2
F 3 - 5 - 1 - 2 - 4

10 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?

A bus
B ring
C star
D extended star

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

A A header and trailer are added.
B Data is converted into packets.
C Packets are packaged into frames.
D Frames are divided into segments.
E Packets are changed into bits for Internet travel.
Which of the following are ways that bandwidth is commonly measured? (Choose three.)

A GHzps
B kbps
C Mbps
D Nbps
E MHzps
F Gbps

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

A Application
B Physical
C Internet
D Network Access
E Presentation

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

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

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

A bits
B packets
C segments
D frames
E data streams