1. 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
2. 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
3. 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*
4. 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
5. 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.
6. What is the complete range of TCP and UDP well-known ports?
0 to 255
0 to 1023*
256 – 1023
1024 – 49151
7. 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
8. 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
9. Which transport layer feature is used to guarantee session establishment?
UDP ACK flag
TCP 3-way handshake*
UDP sequence number
TCP port number
10.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
11. 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
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. 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
14. Which two TCP header fields are used to confirm receipt of data?
FIN flag
SYN flag
checksum
sequence number*
acknowledgment number*
15. 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.
16. 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.
17. 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.
18. Fill in the blank.
During a TCP session, the SYN flag is used by the client to request communication with the server.
19. 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.
20. Match the characteristic to the protocol category. (Not all options are used.)
TCP
window size
3-way handshake
UDP
connectionless
best for VoIP
Both UDP and TCP
checksum
port number
21. Match each application to its connectionless or connection-oriented protocol.
TCP ->
HTTP
FTP
Telnet
UDP ->
TFTP
DHCP
22. Refer to the exhibit. Consider a datagram that originates on the PC and that is destined for the web server. Match the IP addresses and port numbers that are in that datagram to the description. (Not all options are used.)
192.168.1.2 -> source IP address
192.168.2.2 -> destination IP address
2578 -> source port number
80 -> destination port number
