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ENetwork Chapter 7 - CCNA Exploration (Version 4.0)  

2009-03-31 14:00:18|  分类: ccna1 |  标签: |举报 |字号 订阅

Exam Viewer - ENetwork Chapter 7 - 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 Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.)
 
 the Layer 3 protocol selected 
 =the geographic scope of the network 
 the PDU defined by the transport layer 
 =the physical layer implementation 
 =the number of hosts to be interconnected 
 

 

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
7.3.5 Data Link Layer Protocols - The Frame
 

2

Refer to the exhibit. Assuming that the network in the exhibit is converged meaning the routing tables and ARP tables are complete, which MAC address will Host A place in the destination address field of Ethernet frames destined for www.server?
 
 00-1c-41-ab-c0-00 
 =00-0c-85-cf-65-c0 
 00-0c-85-cf-65-c1 
 00-12-3f-32-05-af 
 

 

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
7.4.1 Follow Data Through an Internetwork
 

3 Which options are properties of contention-based media access for a shared media? (Choose three.)
 
 =non-deterministic 
 =less overhead 
 one station transmits at a time 
 =collisions exist 
 devices must wait their turn 
 token passing 
 

 

Scoring Rule For:  correctness of response
Option 1, Option 2, and Option 4 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
7.2.2 Media Access Control for Shared Media
 

4 What is true concerning physical and logical topologies?
 
 The logical topology is always the same as the physical topology. 
 Physical topologies are concerned with how a network transfers frames. 
 Physical signal paths are defined by Data Link layer protocols. 
 =Logical topologies consist of virtual connections between nodes. 
 

 

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
7.2.4 Logical Topology vs Physical Topology
 

5 What determines the method of media access control? (Choose two.)
 
 network layer addressing 
 =media sharing 
 application processes 
 =logical topology 
 intermediary device function 
 

 

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
7.2.1 Placing Data on the Media
 

6 What is true regarding media access control? (Choose three.)
 
 =Ethernet utilizes CSMA/CD 
 =defined as placement of data frames on the media 
 contention-based access is also known as deterministic 
 802.11 utilizes CSMA/CD 
 =Data Link layer protocols define the rules for access to different media 
 controlled access contains data collisions 
 

 

Scoring Rule For:  correctness of response
Option 1, Option 2, 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
7.2.1 Placing Data on the Media
 

7 Which statements describe the logical token-passing topology? (Choose two.)
 
 Network usage is on a first come, first serve basis. 
 =Computers are allowed to transmit data only when they possess a token. 
 Data from a host is received by all other hosts. 
 =Electronic tokens are passed sequentially to each other. 
 Token passing networks have problems with high collision rates. 
 

 

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
7.2.6 Multi-Access Topology
 

8 A network administrator has been asked to provide a graphic representation of exactly where the company network wiring and equipment are located in the building. What is this type of drawing?
 
 logical topology 
 =physical topology 
 cable path 
 wiring grid 
 access topology 
 

 

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
7.2.4 Logical Topology vs Physical Topology
 

9 What is the purpose of the preamble in an Ethernet frame?
 
 is used as a padding for data 
 =is used for timing synchronization 
 is used to identify the source address 
 is used to identify the destination address 
 

 

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
7.3.5 Data Link Layer Protocols - The Frame
 

10 What statements are true regarding addresses found at each layer of the OSI model? (Choose two.)
 
 =Layer 2 may identify devices by a physical address burned into the network card 
 Layer 2 identifies the applications that are communicating 
 =Layer 3 represents a hierarchical addressing scheme 
 Layer 4 directs communication to the proper destination network 
 Layer 4 addresses are used by intermediary devices to forward data 
 

 

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
7.4.1 Follow Data Through an Internetwork
 

11

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 
 None of the networks require media access control. 
 =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. 
 

 

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
7.2.2 Media Access Control for Shared Media
 

12

Refer to the exhibit. How many CRC calculations will take place as traffic routes from the PC to the laptop?
 
 1 
 2 
 4 
 6 
 =8 
 16 
 

 

Scoring Rule For:  correctness of response
2 points for Option 5
0 points for any other option 
Max Value = 2
 

This item references content from the following areas:
CCNA Exploration
7.3.4 Framing - Role of the Trailer
 

13

Refer to the exhibit. A frame is being sent from the PC to the laptop. Which source MAC and IP addresses will be included in the frame as it leaves RouterB? (Choose two.)
 
 source MAC - PC 
 source MAC - S0/0 on RouterA 
 =source MAC - Fa0/1 on RouterB 
 =source IP - PC 
 source IP - S0/0 on RouterA 
 source IP - Fa0/1 of RouterB 
 

 

Scoring Rule For:  correctness of response
Option 3 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
7.4.1 Follow Data Through an Internetwork
 

14 Which sublayer of the data link layer prepares a signal to be transmitted at the physical layer?
 
 LLC 
 =MAC 
 HDLC 
 NIC 
 

 

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
7.1.4 Data Link Layer - Connecting Upper Layer Services to the Media
 

15 What two facts are true when a device is moved from one network or subnet to another? (Choose two.)
 
 The Layer 2 address must be reassigned. 
 The default gateway address should not be changed. 
 =The device will still operate at the same Layer 2 address. 
 Applications and services will need additional port numbers assigned. 
 =The Layer 3 address must be reassigned to allow communications to the new network. 
 

 

Scoring Rule For:  correctness of response
Option 3 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
7.3.3 Addressing - Where the Frame Goes
 

16 What is a function of the data link layer?
 
 provides the formatting of data 
 provides end-to-end delivery of data between hosts 
 provides delivery of data between two applications 
 =provides for the exchange data over a common local media 
 

 

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
7.1.1 Data Link Layer - Supporting and Connecting to Upper Layer Services
 

17 What is a characteristic of a logical point-to-point topology?
 
 The nodes are physically connected. 
 The physical arrangement of the nodes is restricted. 
 =The media access control protocol can be very simple. 
 The data link layer protocol used over the link requires a large frame header. 
 

 

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
7.2.5 Point-to-Point Topology
 

18 What is a primary purpose of encapsulating packets into frames?
 
 provide routes across the internetwork 
 format the data for presentation to the user 
 =facilitate the entry and exit of data on media 
 identify the services to which transported data is associated 
 

 

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
7.3.1 Data Link Layer Protocols - The Frame
 

19 What is the primary purpose of the trailer in a data link layer frame?
 
 define the logical topology 
 provide media access control 
 =support frame error detection 
 carry routing information for the frame 
 

 

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
7.3.4 Framing - Role of the Trailer
 

20 What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.)
 
 =They are 48 binary bits in length. 
 =They are considered physical addresses. 
 =They are generally represented in hexadecimal format. 
 They consist of four eight-bit octets of binary numbers. 
 They are used to determine the data path through the network. 
 They must be changed when an Ethernet device is added or moved within the network. 
 

 

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
7.3.5 Data Link Layer Protocols - The Frame
 

 
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