[ AETN1102 ] (10) Transport Layer - Review

Which layer is responsible for establishing a temporary communication session between the

source and destination host applications?

A. Data link

B. Network

C. Physical

D. Transport

Which three are transport layer responsibilities?

A. Segmenting data and reassembling segments, conversation multiplexing, tracking

individual conversations

B. Identifying frames, conversation multiplexing, tracking individual conversations

C. Identifying routing information, conversation multiplexing, tracking individual

conversations

D. Identifying frames, identifying routing information, tracking individual conversations

Which transport layer protocol statement is true?

A. TCP has fewer fields than UDP

B. UDP provides reliability.

C. TCP is faster than UDP.

D. UDP is a best-effort delivery protocol.

Which transport layer protocol would be used for VoIP applications?

A. VoIP Transfer Protocol

B. Transmission Control Protocol (TCP)

C. User Datagram Protocol (UDP)

D. Session Information Protocol (SIP)

Which transport layer protocol ensures reliable same-order delivery?

A. IP

B. ICMP

C. TCP

D. UDP

Which two applications would use the TCP transport layer protocol?

A. TFTP, ICMP

B. FTP, HTTP

C. ICMP, FTP

D. VoIP, ICMP

Which of the following is a stateless best-effort delivery transport layer protocol?

A. IP

B. ICMP

C. TCP

D. UDP

Which two applications would use the UDP transport layer protocol?

A. TFTP, ICMP

B. TFTP, VoIP

C. ICMP, FTP

D. VoIP, ICMP

Which two fields are the same in a TCP and UDP header?

A. Destination port number, source port number

B. Destination port number, sequence number

C. Destination port number, well-known port number

D. Well-known port number, sequence number

Assume a host with IP address 10.1.2.3 wants to request web services (on port 80) from a

server at 10.1.2.254. Which of the following would display the correct socket pair?

A. 10.1.2.3: 80, 10.1.2.254: 50000

B. 10.1.2.3:50000, 10.1.2.254:80

C. 80:10.1.2.3, 50000:10.1.2.254

D. 50000:10.1.2.3, 80:10.1.2.254

Which port group includes port numbers for FTP, HTTP, and TFTP applications?

A. Dynamic ports

B. Private ports

C. Registered ports

D. Well-known ports

What field is used by the destination host to reassemble segments into the original order?

A. Sequence number

B. Control bits

C. Destination port

D. Source port

Why is UDP desirable for protocols that make a simple request and reply transactions?

A. Flow control

B. Low overhead

C. Reliability

D. Same-order delivery

Which UDP datagram reassembly statement is true?

A. UDP reassembles the data using sequence numbers.

B. UDP does not reassemble the data.

C. UDP reassembles the data using control bits.

D. UDP reassembles the data in the order that it was received.

Which transport layer feature is used to establish a connection-oriented session?

A. UDP sequence number

B. TCP port number

C. TCP 3-way handshake

D. UDP ACK flag

What is a socket?

A. The combination of a source IP address and port number or a destination IP address

and port number

B. The combination of the source and destination sequence and acknowledgment numbers

C. The combination of the source and destination sequence numbers and port numbers

D. The combination of the source and destination IP address and source and destination

Ethernet address

How does a networked server manage requests from multiple clients for different services?

A. Each request is tracked through the physical address of the client.

B. Each request has a combination of source and destination port numbers, coming from a

unique IP address.

C. The server uses IP addresses to identify different services.

D. The server sends all requests through a default gateway.

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

A. The message is lost because FTP does not use a reliable delivery method.

B. The FTP source host sends a query to the destination host.

C. The part of the FTP message that was lost is re-sent.

D. The entire FTP message is re-sent.

What type of applications are best suited for using UDP?

A. Applications that need reliable delivery

B. Applications that are sensitive to packet loss

C. Applications that are sensitive to delay

D. Applications that require retransmission of lost segments

Network congestion has resulted in the source learning of the loss of TCP segments that were

sent to the destination. What is one way that the TCP protocol addresses this?

A. The destination sends fewer acknowledgement messages in order to conserve

bandwidth.

B. The source decreases the amount of data that it transmits before it receives an

acknowledgement from the destination.

C. The source decreases the window size to decrease the rate of transmission from the

destination.

D. The destination decreases the window size.

Which operation is provided by TCP but not by UDP?

A. Identifying individual conversations

B. Retransmitting any unacknowledged data

C. Identifying the applications

D. Reconstructing data in the order received

Which operation is provided by TCP but not by UDP?

A. Identifying individual conversations

B. Identifying the applications

C. Reconstructing data in the order received

D. Acknowledging received data

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

A. To keep track of multiple conversations between devices

B. To inquire for a non-received segment

C. To assemble the segments that arrived out of order

D. To notify the remote device that the conversation is over

What TCP mechanism is used to enhance performance by allowing a device to continuously

send a steady stream of segments as long as the device is also receiving necessary

acknowledgements?

A. Socket pair

B. Three-way handshake

C. Two-way handshake

D. Sliding window

Which action is performed by a client when establishing communication with a server via the

use of UDP at the transport layer?

A. The client sends an ISN to the server to start the 3-way handshake.

B. The client randomly selects a source port number.

C. The client sends a synchronization segment to begin the session.

D. The client sets the window size for the session.

Which two services or protocols use the preferred UDP protocol for fast transmission and low

overhead?

A. POP3 and HTTP

B. VoIP and DNS

C. DNS and FTP

D. HTTP and DNS

Which number or set of numbers represents a socket?

A. AB-CD-12-34-56

B. 10.10.10.15

C. 21

D. 192.168.10.10:80

What is a responsibility of transport layer protocols?

A. Tracking individual conversations

B. Determining the best path to forward a packet

C. Translating private IP addresses to public IP addresses

D. Providing network access