TCP/IP Transport Layer Fundamentals Explained

TCP/IP Transport Layer Fundamentals

1. Transport Layer Header & Session Description

On the basis of the transport layer header shown in the diagram (not provided), what statements describe the established session?

This TCP header contains a Telnet request.

2. TCP/IP Data Encapsulation & Known Port Numbers

With TCP/IP data encapsulation, which range of port numbers identifies all known applications?

0-1023

3. Purpose of Port Numbers in TCP Headers

Why are port numbers included in the TCP header of a segment?

To allow a receiver to transmit data to the appropriate application.

4. OSI Model Layer for Reliable Flow Control

What OSI model layer is responsible for regulating the flow of information from the source to destination, reliably and accurately?

Transport Layer

5. FTP Download & Server Acknowledgment Issues

Refer to the exhibit (not provided). A host is using FTP to download a large file from Server1. During the download process, Server1 does not receive an acknowledgment from the host for several bytes of data transferred. What steps will Server1 take as a result?

Server1 will timeout and retransmit the data that needs to be acknowledged.

6. Importance of Flow Control in TCP Data Transfer

Why is flow control used for TCP data transfer?

To prevent the receiver from being overwhelmed by data.

7. Level 4 Addressing Characteristics

What are two options representing Level 4 addressing?

• Identifies communication applications.
• Identifies multiple conversations between hosts.

8. Wireshark Capture & TCP Session Establishment

Refer to the exhibit (not provided). In line 7 of this Wireshark capture, what TCP operation is being done?

Session establishment.

9. Interpreting Network Output Information

Refer to the exhibit (not provided). What two pieces of information can be determined from the output shown?

• A termination request has been sent to 192.135.250.10.
• Communication with 64.100.173.42 is using secure HTTP.

10. Source Host Data Transmission Dynamics

What dynamic is selected by the source host to send data?

Source port.

11. Key Characteristics of User Datagram Protocol (UDP)

What are two characteristics of User Datagram Protocol (UDP)?

• Low overhead
• Connectionless

12. TCP Flow Control Mechanism

What mechanism is used by TCP to provide flow control as segments travel from source to destination?

Window size.

13. Transport Layer Protocol for Unreliable Delivery

Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?

UDP

14. Common Information in TCP and UDP Headers

What information is found in both TCP and UDP header information?

Source and destination port numbers.

15. TCP Features for Reliable Data Transmission

What are three features that enable TCP to reliably and accurately track the transmission of data from source to destination?

• Flow control
• Session establishment
• Numbering and sequencing

16. TCP Packet Reordering at Destination

During a TCP communication session, if packets arrive at the destination out of order, what will happen with the original message?

The packets will be reordered and assembled at the destination.

17. Important Characteristic of UDP

What is an important characteristic of UDP?

Minimal delays in data delivery.

18. Web Server Response Source TCP Port

After a web browser makes a request to a web server that is listening on a standard port, which is the source TCP port number in the server's response header?

80

19. Event During TCP Three-Way Handshake

What event occurs during the transport layer three-way handshake?

TCP initializes the sequence numbers of the sessions.