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ENetwork Chapter 9 - CCNA Exploration (Version 4.0)  

2009-03-31 14:02:12|  分类: ccna1 |  标签: |举报 |字号 订阅

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Exam Viewer - ENetwork Chapter 9 - CCNA Exploration (Version 4.0)
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Below you will find the assessment items as presented on the exam as well as the scoring rules associated with the item.

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1 Convert the binary number 10111010 into its hexadecimal equivalent. Select the correct answer from the list below.
 
 85 
 90 
 =BA 
 A1 
 B3 
 1C 
 

 

Scoring Rule For:  correctness of response
2 points for Option 3
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.3.3 Hexadecimal Numbering and Addressing
 

2 Which of the following describe interframe spacing? (Choose two.)
 
 =the minimum interval, measured in bit-times, that any station must wait before sending another frame 
 the maximum interval, measured in bit-times, that any station must wait before sending another frame 
 the 96-bit payload padding inserted into a frame to achieve a legal frame size 
 the 96-bit frame padding transmitted between frames to achieve proper synchronization 
 =the time allowed for slow stations to process a frame and prepare for the next frame 
 the maximum interval within which a station must send another frame to avoid being considered unreachable 
 

 

Scoring Rule For:  correctness of response
Option 1 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.4.4 Interframe Spacing and Backoff
 

3 When a collision occurs in a network using CSMA/CD, how do hosts with data to transmit respond after the backoff period has expired?
 
 =The hosts return to a listen-before-transmit mode. 
 The hosts creating the collision have priority to send data. 
 The hosts creating the collision retransmit the last 16 frames. 
 The hosts extend their delay period to allow for rapid transmission. 
 

 

Scoring Rule For:  correctness of response
2 points for Option 1
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.4.2 CSMA/CD - The Process
 

4 After an Ethernet collision, when the backoff algorithm is invoked, which device has priority to transmit data?
 
 the device involved in the collision with the lowest MAC address 
 the device involved in the collision with the lowest IP address 
 =any device in the collision domain whose backoff timer expires first 
 those that began transmitting at the same time 
 

 

Scoring Rule For:  correctness of response
2 points for Option 3
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.4.4 Interframe Spacing and Backoff
 

5 Which of the following is a drawback of the CSMA/CD access method?
 
 =Collisions can decrease network performance. 
 It is more complex than non-deterministic protocols. 
 Deterministic media access protocols slow network performance. 
 CSMA/CD LAN technologies are only available at slower speeds than other LAN technologies. 
 

 

Scoring Rule For:  correctness of response
2 points for Option 1
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.6.1 Legacy Ethernet - Using Hubs
 

6

Refer to the exhibit. The switch and workstation are administratively configured for full-duplex operation. Which statement accurately reflects the operation of this link?
 
 =No collisions will occur on this link. 
 Only one of the devices can transmit at a time. 
 The switch will have priority for transmitting data. 
 The devices will default back to half duplex if excessive collisions occur. 
 

 

Scoring Rule For:  correctness of response
2 points for Option 1
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.6.2 Ethernet - Using Switches
 

7 Why do hosts on an Ethernet segment that experience a collision use a random delay before attempting to transmit a frame?
 
 A random delay is used to ensure a collision-free link. 
 A random delay value for each device is assigned by the manufacturer. 
 A standard delay value could not be agreed upon among networking device vendors. 
 =A random delay helps prevent the stations from experiencing another collision during the transmission. 
 

 

Scoring Rule For:  correctness of response
2 points for Option 4
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.4.2 CSMA/CD - The Process
 

8

In the graphic, Host A has reached 50% completion in sending a 1 KB Ethernet frame to Host D when Host B wishes to transmit its own frame to Host C. What must Host B do?
 
 Host B can transmit immediately since it is connected on its own cable segment. 
 Host B must wait to receive a CSMA transmission from the hub, to signal its turn. 
 Host B must send a request signal to Host A by transmitting an interframe gap. 
 =Host B must wait until it is certain that Host A has completed sending its frame. 
 

 

Scoring Rule For:  correctness of response
2 points for Option 4
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.4.2 CSMA/CD - The Process
 

9 Ethernet operates at which layers of the OSI model? (Choose two.)
 
 Network layer 
 Transport layer 
 =Physical layer 
 Application layer 
 Session layer 
 =Data-link layer 
 

 

Scoring Rule For:  correctness of response
Option 3 and Option 6 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.1.3 Logical Link Control - Connecting to the Upper Layers
 

10 What does the IEEE 802.2 standard represent in Ethernet technologies?
 
 MAC sublayer 
 Physical layer 
 =Logical Link Control sublayer 
 Network layer 
 

 

Scoring Rule For:  correctness of response
2 points for Option 3
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.1.3 Logical Link Control - Connecting to the Upper Layers
 

11 Which statements correctly describe MAC addresses? (Choose three.)
 
 dynamically assigned 
 =copied into RAM during system startup 
 layer 3 address 
 =contains a 3 byte OUI 
 =6 bytes long 
 32 bits long 
 

 

Scoring Rule For:  correctness of response
Option 2, Option 4, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 3
 

This item references content from the following areas:
CCNA Exploration
9.3.2 The Ethernet MAC Address
 

12

Refer to the exhibit. Host_A is attempting to contact Server_B. Which statements correctly describe the addressing Host_A will generate in the process? (Choose two.)
 
 A packet with the destination IP of Router_B. 
 A frame with the destination MAC address of Switch_A. 
 A packet with the destination IP of Router_A. 
 =A frame with the destination MAC address of Router_A. 
 =A packet with the destination IP of Server_B. 
 A frame with the destination MAC address of Server_B. 
 

 

Scoring Rule For:  correctness of response
Option 4 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.3.4 Another Layer of Addressing
 

13 Host A has an IP address of 172.16.225.93, a mask of 255.255.248.0, and a default gateway of 172.16.224.1. Host A needs to send a packet to a new host whose IP is 172.16.231.78. Host A performs the ANDing operation on its address and subnet mask. What two things will occur? (Choose two.)
 
 =Host A will get a result of 172.16.224.0 from the AND process. 
 Host A will send on to the media a broadcast frame that contains the packet. 
 =Host A will broadcast an ARP request for the MAC of the host 172.16.231.78. 
 Host A will change the destination IP of the packet to 172.16.224.1 and forward the packet. 
 Host A will encapsulate the packet in a frame with a destination MAC that is the MAC address associated with 172.16.224.1. 
 

 

Scoring Rule For:  correctness of response
Option 1 and Option 3 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.7.1 The ARP Process - Mapping IP to MAC Addresses
 

14 Which two features make switches preferable to hubs in Ethernet-based networks? (Choose two.)
 
 reduction in cross-talk 
 =minimizing of collisions 
 support for UTP cabling 
 division into broadcast domains 
 =increase in the throughput of communications 
 

 

Scoring Rule For:  correctness of response
Option 2 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.2.2 Ethernet Collision Management
 

15 Ethernet operates at which layer of the TCP/IP network model?
 
 application 
 physical 
 transport 
 internet 
 data link 
 =network access 
 

 

Scoring Rule For:  correctness of response
2 points for Option 6
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.1.1 Ethernet - Standards and Implementation
 

16 What are three functions of the upper data link sublayer in the OSI model? (Choose three.)
 
 recognizes streams of bits 
 =identifies the network layer protocol 
 =makes the connection with the upper layers 
 identifies the source and destination applications 
 =insulates network layer protocols from changes in physical equipment 
 determines the source of a transmission when multiple devices are transmitting 
 

 

Scoring Rule For:  correctness of response
Option 2, Option 3, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 3
 

This item references content from the following areas:
CCNA Exploration
9.1.3 Logical Link Control - Connecting to the Upper Layers
 

17 What three primary functions does data link layer encapsulation provide? (Choose three.)
 
 =addressing 
 =error detection 
 =frame delimiting 
 port identification 
 path determination 
 IP address resolution 
 

 

Scoring Rule For:  correctness of response
Option 1, Option 2, and Option 3 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 3
 

This item references content from the following areas:
CCNA Exploration
9.1.4 MAC - Getting Data to the Media
 

18 What are the two most commonly used media types in Ethernet networks today? (Choose two.)
 
 coaxial thicknet 
 =copper UTP 
 coaxial thinnet 
 =optical fiber 
 shielded twisted pair 
 

 

Scoring Rule For:  correctness of response
Option 2 and Option 4 are correct.
1 point for each correct option.
0 points if more options are selected than required. 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.1.5 Physical Implementations of Ethernet
 

19

Refer to the exhibit. Which option correctly identifies content that the frame data field may contain?
 
 preamble and stop frame 
 =network layer packet 
 physical addressing 
 FCS and SoF 
 

 

Scoring Rule For:  correctness of response
2 points for Option 2
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.3.1 The Frame - Encapsulating the Packet
 

20 What is the primary purpose of ARP?
 
 translate URLs to IP addresses 
 =resolve IPv4 addresses to MAC addresses 
 provide dynamic IP configuration to network devices 
 convert internal private addresses to external public addresses 
 

 

Scoring Rule For:  correctness of response
2 points for Option 2
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
9.7.2 The ARP Process - Destinations outside the Local Network
 

 
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