CCNA 1 R&S Introduction to Networks Chapter 7 QUIZ

1 What is the purpose of using a source port number in a TCP communication?

to notify the remote device that the conversation is over
to assemble the segments that arrived out of order
to keep track of multiple conversations between devices*
to inquire for a nonreceived segment

2 Which three fields are used in a UDP segment header? (Choose three.)

Window Size
Length*
Source Port*
Acknowledgment Number
Checksum*
Sequence Number

3

Refer to the exhibit. What does the value of the window size specify?

the amount of data that can be sent at one time
the total number of bits received during this TCP session
the amount of data that can be sent before an acknowledgment is required*
a random number that is used in establishing a connection with the 3-way handshake

4 What happens if part of an FTP message is not delivered to the destination?

The message is lost because FTP does not use a reliable delivery method.
The FTP source host sends a query to the destination host.
The part of the FTP message that was lost is re-sent.*
The entire FTP message is re-sent.

5 What is an advantage of UDP over TCP?

UDP communication requires less overhead.*
UDP communication is more reliable.
UDP reorders segments that are received out of order.
UDP acknowledges received data.

6 Open the PT Activity. Perform the tasks in the activity instructions and then answer the question or complete the task.

What is the application layer service being requested from Server0 by PC0?

DNS
FTP
HTTP
SMTP
HTTPS*

7 When a client connects to an HTTP server by the use of a randomly generated source port number, what destination port number will the HTTP server use when building a response?

a randomly generated destination port number
a destination port number of 80, referencing the service requested
the original source port number that was randomly generated by the client*
the original destination port number that was generated by the client

8 Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

The client sets the window size for the session.
The client sends an ISN to the server to start the 3-way handshake.
The client randomly selects a source port number.*
The client sends a synchronization segment to begin the session.

9 Which number or set of numbers represents a socket?

01-23-45-67-89-AB
21
192.168.1.1:80*
10.1.1.15

10 Match the TCP flag to the correct step in the session establishment sequence. (Not all options are used.)

step 1 -> SYN

step 2 -> SYN + ACK

step 3 -> ACK

11

What step in a TCP session does this capture represent?

initial sequence number establishment
reassembly of data segments
session termination*
step 3 of session establishment

12 Which two applications use UDP as the transport layer protocol? (Choose two.)

DNS queries*
DHCP*
HTTP
SMTP
Telnet