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CCNA 1 OSI Transport Layer
Chapter 4
86
Computer Science
Professional
04/23/2008

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Term

 

 

 

What are the 4 primary responsib/ilities of the Transport Layer?

Definition

1).   Tracking

2).   Segmentation

3).   Reassembling

4).   Identifying the different applications

Tracking= is the individual conversation between applications on the source and destination host.

Segmentation= is data and managing each piece.

Reassembling= is the sementaton streams and application data.

 

Identifying the different applications.

Term

 

 

 

 

What does the Transport Layer header provide?

Definition

 

1). Provides field of bits

 

2).  Provide values in these fields that enable different transport layer.  Protocols to perform different functions.

 

Term

 

 

 

Describe the process of segmentation and reassembly?

Definition

 

Segmentation= Transport layer divides application data into blocks of data that are an appropriate size.

 

Reassembly= Transport layer reassembly the data before sending it to the destination application or service.

 

Term

 

 

 

How does the Transport Layer accomplish conversation mulitplexing?

Definition

 

 

Each application or service is assigned an address known as a port so that the transport layer can determine with which application or service the data is identified.

Term

 

 

What are the four additional duties the Transport Layer can provide?

Definition

1).  Connection -Oriented conversations

 

2).  Reliable delivery

 

3).  Ordered data reconstruction

 

4).  Flow Control

Term

 

 

  What are the four processess that the Transport Layer uses to control conversations?

 

1).  Establish a Session

2).  Reliable Delivery

3).  Same Order Delivery

4).  Flow Control

Definition

1).   Establish a Session = Ensures the application is ready to receive the data.

 

2).   Reliable Delivery = Means lost segments are resent so the data is received complete.

 

3).    Same Order Delivery = Ensures data is delivered sequentially as it was sent.

 

4).     Flow Control = Delivery if there is congestion on the host.

Term

 

 

 

  

Definition

 

 

 

Term

 

 

 

 

 

Definition

 

Term

 

 

What are the two most common protocols at the

Transport Layer?

 

                     TCP

                     UDP

Definition

 

 

             TCP = Transmission Control Protocol

 

              UDP = User Datagram Protocol

Term

 

 

 What is the advantage of using UDP?

Definition

 

1).  Simple

 

2).  Connectionless Protocol

 

3).   Advantages = Provides for low overhead data delivered.

Term

 

 

 

   What are the pieces of UDP information called?

Definition

 

 

Pieces of UDP are called Datagrams

 

Datagrams are sent at Best-Effort

Term

 

 

 

   What are some applications that use UDP?

Definition

 

 

  DNS = Domain Named System

 

  Video Streaming

 

  Voip ( Voice-over-IP)

Term

 

 

 

    What are the 3 additional functions that TCP offers?

Definition

  

1).   Delivery

 

2).   Reliable delivery

 

3).   Flow Control

Term

 

 

 

  How much overhead is required to offer the 3 functions of TCP?

Definition

 

 

  TCP has 20 bytes of overhead in the header encapsulating the Application Layer data.

Term

 

 

 

   What are the pieces of TCP information called?

Definition

 

 

   The pieces of TCP information are called

 

   Segment.

Term

 

 

 

   What is the range of Well Known Ports?

Definition

 

 

                    ( 0 - 1023)

Term

 

 

 

    Well known TCP Ports:

Definition

20 = FTP

21 = FTP

23 = Telnet

25 = SMTP

80 = HTTP

110 = POP3

194 = Internet Relay Chat (IRC)

443 = Secure HTTPs

Term

 

 

 

                      Well-Known UDP

Definition

 

 

 

                       69  = TFTP

                       520 = RIP    

Term

 

 

 

                 What are well know ports?

Definition

  

 

 

           The numbers are reserved for services

and application.

Term

 

 

 

   What are the range of Registered Ports?

Definition

 

 

 

                  (1024 - 49151)

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