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ENetwork Chapter 4 - CCNA Exploration (Version 4.0)   

2009-03-31 13:57:25|  分类: ccna1 |  标签: |举报 |字号 订阅

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Exam Viewer - ENetwork Chapter 4 - 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

Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)
 
 This is a UDP header. 
 =This contains a Telnet request. 
 This contains a TFTP data transfer. 
 =The return packet from this remote host will have an Acknowledgement Number of 43693. 
 This is a TCP header. 
 

 

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
4.1.5 Port Addressing
 

2 With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
 
 0 to 255 
 256 to 1022 
 =0 to 1023 
 1024 to 2047 
 49153 to 65535 
 

 

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
4.1.5 Port Addressing
 

3 Why are port numbers included in the TCP header of a segment?
 
 to indicate the correct router interface that should be used to forward a segment 
 to identify which switch ports should receive or forward the segment 
 to determine which Layer 3 protocol should be used to encapsulate the data 
 =to enable a receiving host to forward the data to the appropriate application 
 to allow the receiving host to assemble the packet in the proper order 
 

 

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
4.1.5 Port Addressing
 

4 Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
 
 application 
 presentation 
 session 
 =transport 
 network 
 

 

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
4.1.1 Purpose of the Transport Layer
 

5

Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?
 
 create a Layer 1 jam signal 
 =reach a timeout and resend the data that needs to be acknowledged 
 send a RESET bit to the host 
 change the window size in the Layer 4 header 
 

 

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
3.3.1 DNS Services and Protocol
 

6 Why is flow control used for TCP data transfer?
 
 to synchronize equipment speed for sent data 
 to synchronize and order sequence numbers so data is sent in complete numerical order 
 =to prevent the receiver from being overwhelmed by incoming data 
 to synchronize window size on the server 
 to simplify data transfer to multiple hosts 
 

 

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
4.3.4 TCP Congestion Control - Minimizing Segment Loss
 

7 Which two options represent Layer 4 addressing? (Choose two.)
 
 identifies the destination network 
 identifies source and destination hosts 
 =identifies the communicating applications 
 =identifies multiple conversations between the hosts 
 identifies the devices communicating over the local media 
 

 

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
1.5.1 Where Is It All Going?
 

8

Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?
 
 =session establishment 
 segment retransmit 
 data transfer 
 session disconnect 
 

 

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
4.2.4 TCP Three-Way Handshake
 

9

Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)
 
 =The local host is using three client sessions. 
 =The local host is using web sessions to a remote server. 
 The local host is listening for TCP connections using public addresses. 
 The local host is using well-known port numbers to identify the source ports. 
 The local host is performing the three-way handshake with 192.168.101:1037. 
 

 

Scoring Rule For:  correctness of response
Option 1 and Option 2 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
4.1.5 Port Addressing
4.5.1 Observing TCP and UDP using Netstat
 

10 What is dynamically selected by the source host when forwarding data?
 
 destination logical address 
 source physical address 
 default gateway address 
 =source port 
 

 

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
1.5.1 Where Is It All Going?
 

11 What are two features of the User Datagram Protocol (UDP)? (Choose two.)
 
 flow control 
 low overhead 
 =connectionless 
 =connection-oriented 
 sequence and acknowledgements 
 

 

Scoring Rule For:  correctness of response
Option 2 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
4.4.1 UDP - Low Overhead vs. Reliability
 

12 What mechanism is used by TCP to provide flow control as segments travel from source to destination?
 
 sequence numbers 
 session establishment 
 =window size 
 acknowledgments 
 

 

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
4.3.4 TCP Congestion Control - Minimizing Segment Loss
 

13 Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?
 
 TCP 
 IP 
 =UDP 
 HTTP 
 DNS 
 

 

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
4.4.1 UDP - Low Overhead vs. Reliability
 

14 Which information is found in both the TCP and UDP header information?
 
 sequencing 
 flow control 
 acknowledgments 
 =source and destination port 
 

 

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
4.1 Roles of the Transport Layer
 

15 Which three features allow TCP to reliably and accurately track the transmission of data from source to destination? (Choose three.)
 
 =flow control 
 urgent pointer 
 best effort delivery 
 =session establishment 
 connectionless services 
 =numbering and sequencing 
 

 

Scoring Rule For:  correctness of response
Option 1, Option 4, and Option 6 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
4.1.2 Controlling the Conversations
 

16 During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?
 
 The packets will not be delivered. 
 The packets will be retransmitted from the source. 
 =The packets will be delivered and reassembled at the destination. 
 The packets will be delivered and not reassembled at the destination. 
 

 

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
3.1.1 OSI and TCP/IP Model
 

17 Which is an important characteristic of UDP?
 
 acknowledgement of data delivery 
 =minimal delays in data delivery 
 high reliability of data delivery 
 same order data delivery 
 

 

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
4.1.1 Purpose of the Transport Layer
 

18 After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?
 
 13 
 53 
 =80 
 1024 
 1728 
 

 

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
4.2.2 TCP Server Processes
 

19 Which event occurs during the transport layer three-way handshake?
 
 The two applications exchange data. 
 =TCP initializes the sequence numbers for the sessions. 
 UDP establishes the maximum number of bytes to be sent. 
 The server acknowledges the bytes of data received from the client. 
 

 

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
4.2.4 TCP Three-Way Handshake
 

20

Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?
 
 Host1 sends a segment with the ACK flag = 0, SYN flag = 0 to Host2. 
 Host1 sends a segment with the ACK flag = 1, SYN flag = 0 to Host2. 
 Host1 sends a segment with the ACK flag = 1, SYN flag = 1 to Host2. 
 Host2 sends a segment with the ACK flag = 0, SYN flag = 1 to Host1. 
 Host2 sends a segment with the ACK flag = 1, SYN flag = 0 to Host1. 
 =Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1. 
 

 

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
4.2.3 TCP Connection Establishment and Termination
 

 
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