Time out - transport layer, Computer Networking

Assignment Help:

Time  out

Timers  are used to protect  against  lost packet. Each  packet  must have its own logical  timers since  only  a single  packet  will be retransmitted  after timeout. A single  hardware timer can be used to mimic  the function of  multiple logical  timers.

The SR receiver  will  acknowledge  a correctly received packet whether or not it is  in order. Out of order packets  are buffered  until any missing packets ( that  is packets with lower  sequence numbers) are received. The  various actions  taken by the SR receiver.

Packet  with  sequence  number in ( rev base re base + N- 1) is correctly received. In  this case  the received packet falls within the  receiver window  and a selective ACK  packet  is returned  to the  sender.

If  the packet was not  previously  received it  is buffered. If this  packet  has a sequence number  equal to the base of the  window  then this  packet  and any  previously  buffered  and consecutively numbered packets are delivered to the receiver. The  receiver window is them moved  forward  by the number of packets  delivered to the receiver as in figure when a packet  with a  sequence number of 2 is  received  then packets 3, 4 and 5 can  be delivered to the receiver.

Packet with  sequence  number in  ( rev base n rev base-1)  is received. In  this case an ACK  must be  generated this is the packet  which  the receiver has previously  acknowledge.

Otherwise ignores the  packets.

To understand  the functions of SR protocols  lets  take an example  of a window  size of  four packets. The sender  can sends  packets 0 to 3. If  first  packet pkt 0 is  lost  and pkt 1 , 2   and 3 are received by the  receiver instead of discarding these  packets  the receiver  buffers  the packets  and send  the ACK  for the  packets  respectively. After the  time out  of pkt 0 the sender  can retransmit this  lost  packet  pkt 0 if  the receiver receives the lost  packet  pkt 0  then the  receiver deliver all the  packets  which  was kept  buffered  by the  receiver previously.


Related Discussions:- Time out - transport layer

The network interface layer - fundamentals of networks, The Network Interfa...

The Network Interface Layer The functions  of the data  link layer and the physical  layer of   the OSI model  have been  combined into a  single  layer called  the network in

Topologies, discuss communication isolation and privatization in network to...

discuss communication isolation and privatization in network topologies

What is bia, Burn in Address other name is MAC address

Burn in Address other name is MAC address

Uneven load distribution, Uneven Load Distribution In the parallel com...

Uneven Load Distribution In the parallel computer, the problem is dividing into sub-problems and is assigned for computation to various processors. But sometimes the sub-probl

Time out - transport layer, Time  out Timers  are used to protect  aga...

Time  out Timers  are used to protect  against  lost packet. Each  packet  must have its own logical  timers since  only  a single  packet  will be retransmitted  after timeou

State the software requirement for an intranet, State the Software requir...

State the Software requirement for an intranet To develop an Intranet the first we should design a Client /Server model for our network. As you know clients are the computers

Case study, #questi Scenario: Your Case Study must be based on the informat...

#questi Scenario: Your Case Study must be based on the information provided. There will be no additional information. This must be submitted in a .doc, or .pdf format. If you sen

What are the five major network services, What are the five major network s...

What are the five major network services? Major Network Services are: a. File Services b. Message Services c.  Print Services  d.  Application Services e.  Datab

Identify three udp characteristics, UPD is a layer 4 Transport protocol. It...

UPD is a layer 4 Transport protocol. It is connection-less due to it does establish a connection thus the 3 step handshake is not needed, it does NOT execute any flow control or ac

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd