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 CCNA interview questions  CCNA Interview Questions
 CCDA interview questions  CCDA Interview Questions
Question
The PDU at the network layer is a ________
 
    Packet  
   Frame  
   Segment  
   Bit  
 


 
 Question Submitted By :: Samham
I also faced this Question!!     Rank Answer Posted By  
 
  Re: The PDU at the network layer is a ________ Packet Frame Segment Bit
Answer
# 1
Segment
 
Is This Answer Correct ?    1 Yes 3 No
Jitendra
 
  Re: The PDU at the network layer is a ________ Packet Frame Segment Bit
Answer
# 2
packet
 
Is This Answer Correct ?    3 Yes 1 No
Shivali
 
 
 
  Re: The PDU at the network layer is a ________ Packet Frame Segment Bit
Answer
# 3
Explanation:
A segment is the unit of end-to-end transmission in the TCP 
protocol. In general discussion about transmitting 
information from one node to another, the term "packet" is 
used loosely to refer to a piece of data. However, the 
specific packet of data formed by TCP in the transport 
layer is called a "segment."

When an application needs to send information to another 
network-attached computer, it forms a message. The message 
is passed to TCP (assuming a reliable protocol is needed; 
otherwise, it is sent to UDP), where it is encapsulated 
into a segment. The segment is sent to IP where it is 
encapsulated into a datagram. The datagram is sent to the 
data link layer where it is encapsulated into frames.

Message:    The actual application data, command, or 
instruction specified by the user or application. A message 
is encapsulated within a TCP segment assuming TCP is used.

Segment:    The packet of information exchanged between two 
connected systems (peers) that contains transport layer 
protocol information. TCP exchanges segments. Segments 
encapsulate upper-layer messages. 

Datagram:    The packet of information that is exchanged 
between two connected systems that contains network layer 
protocol information. IP exchanges datagrams. Datagrams 
encapsulate segments.

Frame:    The packet of information at the data link layer 
with a layout that is specific to the protocol in use. 
Frames encapsulate datagrams.

More: In general, the term packet applies to any message 
formatted as a packet, while the term datagram is generally 
reserved for packets of an "unreliable" service. 
A "reliable" service is one that notifies the user if 
delivery fails, while an "unreliable" one does not notify 
the user if delivery fails. For example, IP provides an 
unreliable service. Together, TCP and IP provide a reliable 
service, whereas UDP and IP provide an unreliable one. All 
these protocols use packets, but UDP packets are generally 
called datagrams.

Transmission Control Protocol (TCP) accepts data from a 
data stream, 'segments' it into chunks, and adds a TCP 
header creating a TCP segment. The TCP segment is then 
encapsulated into an IP packet. A TCP segment is "the 
packet of information that TCP uses to exchange data with 
its peers." 

Note that the term TCP packet is now used interchangeably 
with the term TCP segment. Although in the original RFC 
segment usually referred to the TCP unit of data, datagram 
to the IP unit and packet to the data communications 
network unit:

Processes transmit data by calling on the TCP and passing 
buffers of data as arguments. The TCP packages the data 
from these buffers into segments and calls on the internet 
module [e.g. IP] to transmit each segment to the 
destination TCP.

http://tools.ietf.org/html/rfc791#section-2.1
 
Is This Answer Correct ?    0 Yes 0 No
Pachicoo
 

 
 
 
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