CCNA 1 Chapter 7 V5.0 Answers

1. A host device sends a data packet to a web server via the HTTP protocol. What is used by the transport layer to pass the data stream to the proper application on the server?

sequence number

acknowledgment

source port number

destination port number

 

2. What does a client application select for a TCP or UDP source port number?

a random value in the well-known port range

a random value in the range of the registered ports

a predefined value in the well-known port range

a predefined value in the range of the registered ports

 

3. What is a socket?

the combination of the source and destination IP address and source and destination Ethernet address

the combination of a source IP address and port number or a destination IP address and port number

the combination of the source and destination sequence and acknowledgment numbers

the combination of the source and destination sequence numbers and port numbers

 

4. Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices? (Choose two.)

ACK

FIN

PSH

RST

SYN

URG

 

5. Fill in the blank using a number.

A total of ...4...messages are exchanged during the TCP session termination process between the client and the server.

 

6. What is a beneficial feature of the UDP transport protocol?

acknowledgment of received data

fewer delays in transmission

tracking of data segments using sequence numbers

the ability to retransmit lost data

 

7. A host device needs to send a large video file across the network while providing data communication to other users. Which feature will allow different communication streams to occur at the same time, without having a single data stream using all available bandwidth?

window size

multiplexing

port numbers

acknowledgments

 

8. Fill in the blank.

During a TCP session, the...SYN...flag is used by the client to request communication with the server.

 

9.

 

10. A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC?

1 segment

10 segments

100 segments

1000 segments

 

11. Which transport layer feature is used to guarantee session establishment?

UDP ACK flag

TCP 3-way handshake

UDP sequence number

TCP port number

 

12. During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?

the total number of bytes that have been received

one number more than the sequence number

the next byte that the destination expects to receive

the last sequence number that was sent by the source

 

13. Which scenario describes a function provided by the transport layer?

A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network.

A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.

A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.

A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.

 

14. A technician wishes to use TFTP to transfer a large file from a file server to a remote router. Which statement is correct about this scenario?

The file is segmented and then reassembled in the correct order by TCP.

The file is segmented and then reassembled in the correct order at the destination, if necessary, by the upper-layer protocol.

The file is not segmented, because UDP is the transport layer protocol that is used by TFTP.

Large files must be sent by FTP not TFTP.

 

15.

TCP uses 3-way handshaking as part of being able to provide reliable communication and window size to provide data flow control. UDP is a connectionless protocol that is great for video conferencing. Both TCP and UDP have port numbers to distinguish between applications and application windows and a checksum field for error detection.

 

16.

A TCP/IP segment that originated on the PC has 192.168.1.2 as the IP source address. 2578 is the only possible option for the source port number because the PC port number must be in the range of registered ports 1024 to 49151. The destination is the web server, which has the IP address 192.168.2.2, and the destination port number is 80 according to the HTTP protocol standard.

 

17. Which factor determines TCP window size?

the amount of data to be transmitted

the number of services included in the TCP segment

the amount of data the destination can process at one time

the amount of data the source is capable of sending at one time

 

18. Which two TCP header fields are used to confirm receipt of data?

FIN flag

SYN flag

checksum

sequence number

acknowledgment number

 

19. What happens if the first packet of a TFTP transfer is lost?

The client will wait indefinitely for the reply.

The TFTP application will retry the request if a reply is not received.

The next-hop router or the default gateway will provide a reply with an error code.

The transport layer will retry the query if a reply is not received.

 

20. What does a client do when it has UDP datagrams to send?

It just sends the datagrams.

It queries the server to see if it is ready to receive data.

It sends a simplified three-way handshake to the server.

It sends to the server a segment with the SYN flag set to synchronize the conversation.

 

21. What is the complete range of TCP and UDP well-known ports?

0 to 255

0 to 1023

256 - 1023

1024 - 49151

 

22. Compared to UDP, what factor causes additional network overhead for TCP communication?

network traffic that is caused by retransmissions

the identification of applications based on destination port numbers

the encapsulation into IP packets

the checksum error detection