Round trip time and time out - transport layer, Computer Networking

Round Trip Time (RTT) and Time Out

The  size and  the complexity  of computer  networks  have grown  in past years. To achieve  an efficient  and reliable transmission  some  protocols inevitably need to handle  complicated network  traffics and unexpected transmission losses. These problems  usually  are  referred to as flow  control  and congestion control. The technologies  of managing complex computer  network  need to be more  circumspect not only  in the sending  host and  receiving  hosts but also  the intermediate routes. One of these protocols  is the  transmission control  protocol that has a responsibility  of ensuring reliability.

Because TCP  guarantees the reliable delivery  of data it retransmits  each segment  if an ACK is not received in a certain period of time. TCP  sets this  timeout as a function of the round trip time it expects between  the two ends  of eh connection . unfortunately given  the range of possible RTT between  any pair  of hosts  in the internet as well  as the variation in RTT between  the same two  hosts  over time. Choosing  appropriate timeout  value is  not very easy. To address this problem TCP uses an adapt retransmission mechanism.

Round  trip  time (RTT)  is an important in determining the behaviour of  a TCP  connection  passively estimating  RTT  is useful  in measuring  the congestion window size and retransmission  timeout of a connection as well as the  available bandwidth on a path. This information can help  determine factors that limit data flow rates  and can congestion. When  known  at  a network  link along the path RTT can also  aid efficient queen management  and buffer provisioning. Additionally  RTT can be used  to improve node  distribution  in peer to peer  and overlay  networks.

 The  amount  of time  set at  the time is however of great importance. If  the time  expires too quickly then premature time outs will be  generated during  usual  case and thus unnecessary retransmission will occur. On the  other hand  if a long time  is set for the timer the TCP will slowly respond to the segment  loss which  means longer delays in the  transportation and overall  end to end  delay. Therefore  the TCP time out must be set to  be as optimum  as possible.

Posted Date: 3/13/2013 12:09:25 AM | Location : United States







Related Discussions:- Round trip time and time out - transport layer, Assignment Help, Ask Question on Round trip time and time out - transport layer, Get Answer, Expert's Help, Round trip time and time out - transport layer Discussions

Write discussion on Round trip time and time out - transport layer
Your posts are moderated
Related Questions
A data link is shared by 20 data sources. Each source is active only 10% of the time and produces 1Mbps data rate when active. The sources start their transmissions at random. a

What is the main purpose of OSPF? OSPF, or Open Shortest Path First, is a link-state routing protocol that uses routing tables to verify the best possible path for data exchang

bus topology disadvantage?

What are the important topologies for networks? BUS topology: In this every computer is directly linked to primary network cable in a single line. Advantages: Inexpensive,

Configure basic switch parameters. Configure the S1, S2, and S3 switches according to the following guidelines: Configure the switch hostname. Disable DNS lookup.

Q. What is Data traffic? Data traffic Peak data rate : max data rate of the traffic Average data rate = (amount of data)/time Maximum Burst size: max. l

PRAM is one of the models used for designing the parallel algorithm as given in Figure. The PRAM models have the following components: A set of identical type of processors

Q. Explain about Multiplicative Decrease ? Multiplicative Decrease (MD) if a time-out take places the threshold is set to one maximum segment size (TCP Tahoe, TCP Reno).

What are the key elements of protocols? The key elements of protocols are a. Syntax   It refers to the structure or format of the data that is the order in which they a

Design the user interface for mode switching and data entry any way that you like. For example, to switch an application from transmit mode to receive mode, you can give it special