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telugu sarasamaina kathalu online, telugu bhutu kathalu com, kathalu in telugu pdf, telugu buthu kathalu in, telugu boothu kathalu and boothu videolu, telugu kamakeli kathalu, telugu puku kathalu in telugu, telugu lo boothu kathalu pdf, boothukathalu, telugu pooku kathalu in telugu, puku kadalu, puku telugu, telugu boothu kathalu boothu videolu, telugu kathalu aunty, lanjala kathalu telugu pdf, telugu boothu kathalu soumya reddy, puku bommalu and kathalu, telugu pdf boothu kathalu, telugu kathalu, telugu dengudu kathalu in pdf, telugu boothu kathalu in telugu. explicitly the sender of the reception and the sender could retransmit this segment although it has already been received. A possible solution to improve the performance of selective repeat is to provide additional information about the received segments in the cknowledgements that are returned by the receiver. For example,the receiver could add in he returned acknowledgement the list of the sequence numbers of all segments that have already been received. Such acknowledgements are sometimes called selective cknowledgements. This is illustrated in the figure below. In the figure above, when the sender receives C(OK,0,[2]), it knows that all segments up to and including D have been correctly received. It also knows that segment D(2,...) has been received and can cancel the retransmission timer associated to this segment. However, this segment should not be removed from the sending buffer before the reception of a cumulative acknowledgement (C(OK,2) in the figure above) that covers this segment. Note: Maximum window size with go-back-n and selective repeat A transport protocol that uses n bits to encode its sequence number can send up to 2n different segments. However, to ensure a reliable delivery of the segments, go-back-n and selective repeat cannot use a sending window of 2n segments. Consider first go-back-n and assume that a sender sends 2n segments. These segments are received in-sequence by the destination, but all the returned acknowledgements are lost. The sender will retransmit all segments and they will all be accepted by the receiver and delivered a second time to the user. It is easy to see thatthis problem can be avoided if the maximum size of the sending window is 2n 1 segments. A similar problem occurs with selective repeat. However, as the receiver accepts out-of-sequence segments, a sending window of 2n 1 segments is not sufficient to ensure a reliable delivery of all segments. It can be easily shown that to avoid this problem, a selective repeat sender cannot use a window that is larger than 2n 2 segments. Go-back-n or selective repeat are used by transport protocols to provide a reliable data transfer above an unreliable network layer service. Until now, we have assumed that the size of the sliding window was fixed for the entire lifetime of the connection. In practice a transport layer entity is usually implemented in the operating system and shares memory with other parts of the system. Furthermore, a transport layer entity must support several (possibly hundreds or thousands) of transport connections at the same time. This implies that the memory which can be used to support the sending or the receiving buffer of a transport connection may change during the lifetime of the connection 4 . Thus, a transport protocol must allow the sender and the receiver to adjust their window sizes. To deal with this issue, transport protocols allow the receiver to advertise the current size of its receiving window in all the acknowledgements that it sends. The receiving window advertised by the receiver bounds the size of the sending buffer used by the sender. In practice, the sender maintains two state variables : swin, the size of its sending window (that may be adjusted by the system) and rwin, the size of the receiving window advertised by the receiver. At any time, the number of unacknowledged segments cannot be larger than min(swin,rwin) 5 . The utilisation of dynamic windows is illustrated in the figure below. The receiver may adjust its advertised receive window based on its current memory consumption, but also to limit the bandwidth used by the sender. In practice, the receive buffer can also shrink as the application may not able to process the received data quickly enough. In this case, the receive buffer may be completely full and the advertised receive window may shrink to 0. When the sender receives an acknowledgement with a receive window set to 0, it is blocked until it receives an acknowledgement with a positive receive window. Unfortunately, as shown in the figure below, the loss of this acknowledgement could cause a deadlock as the sender waits for an acknowledgement while the receiver is waiting for a data segment. To solve this problem, transport protocols rely on a special timer : the persistence timer. This timer is started by the sender whenever it receives an acknowledgement advertising a receive window set to 0. When the timer expires, the sender retransmits an old segment in order to force the receiver to send a new acknowledgement, and hence send the current receive window size. To conclude our description of the basic mechanisms found in transport protocols, we still need to discuss the impact of segments arriving in the wrong order. If two consecutive segments are reordered, the receiver relies on their sequence numbers to reorder them in its receive buffer. Unfortunately, as transport protocols reuse the same sequence number for different segments, if a segment is delayed for a prolonged period of time, it might still be accepted by the receiver. This is illustrated in the figure below where segment D is delayed.
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telugu sarasamaina kathalu online, telugu bhutu kathalu com, kathalu in telugu pdf, telugu buthu kathalu in, telugu boothu kathalu and boothu videolu, telugu kamakeli kathalu, telugu puku kathalu in telugu, telugu lo boothu kathalu pdf, boothukathalu, telugu pooku kathalu in telugu, puku kadalu, puku telugu, telugu boothu kathalu boothu videolu, telugu kathalu aunty, lanjala kathalu telugu pdf, telugu boothu kathalu soumya reddy, puku bommalu and kathalu, telugu pdf boothu kathalu, telugu kathalu, telugu dengudu kathalu in pdf, telugu boothu kathalu in telugu. explicitly the sender of the reception and the sender could retransmit this segment although it has already been received. A possible solution to improve the performance of selective repeat is to provide additional information about the received segments in the cknowledgements that are returned by the receiver. For example,the receiver could add in he returned acknowledgement the list of the sequence numbers of all segments that have already been received. Such acknowledgements are sometimes called selective cknowledgements. This is illustrated in the figure below. In the figure above, when the sender receives C(OK,0,[2]), it knows that all segments up to and including D have been correctly received. It also knows that segment D(2,...) has been received and can cancel the retransmission timer associated to this segment. However, this segment should not be removed from the sending buffer before the reception of a cumulative acknowledgement (C(OK,2) in the figure above) that covers this segment. Note: Maximum window size with go-back-n and selective repeat A transport protocol that uses n bits to encode its sequence number can send up to 2n different segments. However, to ensure a reliable delivery of the segments, go-back-n and selective repeat cannot use a sending window of 2n segments. Consider first go-back-n and assume that a sender sends 2n segments. These segments are received in-sequence by the destination, but all the returned acknowledgements are lost. The sender will retransmit all segments and they will all be accepted by the receiver and delivered a second time to the user. It is easy to see thatthis problem can be avoided if the maximum size of the sending window is 2n 1 segments. A similar problem occurs with selective repeat. However, as the receiver accepts out-of-sequence segments, a sending window of 2n 1 segments is not sufficient to ensure a reliable delivery of all segments. It can be easily shown that to avoid this problem, a selective repeat sender cannot use a window that is larger than 2n 2 segments. Go-back-n or selective repeat are used by transport protocols to provide a reliable data transfer above an unreliable network layer service. Until now, we have assumed that the size of the sliding window was fixed for the entire lifetime of the connection. In practice a transport layer entity is usually implemented in the operating system and shares memory with other parts of the system. Furthermore, a transport layer entity must support several (possibly hundreds or thousands) of transport connections at the same time. This implies that the memory which can be used to support the sending or the receiving buffer of a transport connection may change during the lifetime of the connection 4 . Thus, a transport protocol must allow the sender and the receiver to adjust their window sizes. To deal with this issue, transport protocols allow the receiver to advertise the current size of its receiving window in all the acknowledgements that it sends. The receiving window advertised by the receiver bounds the size of the sending buffer used by the sender. In practice, the sender maintains two state variables : swin, the size of its sending window (that may be adjusted by the system) and rwin, the size of the receiving window advertised by the receiver. At any time, the number of unacknowledged segments cannot be larger than min(swin,rwin) 5 . The utilisation of dynamic windows is illustrated in the figure below. The receiver may adjust its advertised receive window based on its current memory consumption, but also to limit the bandwidth used by the sender. In practice, the receive buffer can also shrink as the application may not able to process the received data quickly enough. In this case, the receive buffer may be completely full and the advertised receive window may shrink to 0. When the sender receives an acknowledgement with a receive window set to 0, it is blocked until it receives an acknowledgement with a positive receive window. Unfortunately, as shown in the figure below, the loss of this acknowledgement could cause a deadlock as the sender waits for an acknowledgement while the receiver is waiting for a data segment. To solve this problem, transport protocols rely on a special timer : the persistence timer. This timer is started by the sender whenever it receives an acknowledgement advertising a receive window set to 0. When the timer expires, the sender retransmits an old segment in order to force the receiver to send a new acknowledgement, and hence send the current receive window size. To conclude our description of the basic mechanisms found in transport protocols, we still need to discuss the impact of segments arriving in the wrong order. If two consecutive segments are reordered, the receiver relies on their sequence numbers to reorder them in its receive buffer. Unfortunately, as transport protocols reuse the same sequence number for different segments, if a segment is delayed for a prolonged period of time, it might still be accepted by the receiver. This is illustrated in the figure below where segment D is delayed.
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the connectionless network layer service never discards SDUs the connectionless network layer service never delays, reorders nor duplicate SDUs the connectionless network layer service can support SDUs of any size We will then remove each of these assumptions one after the other in order to better understand the mechanisms used to solve each imperfection. Reliable data transfer on top of a perfect network service The transport layer entity interacts with both a user in the application layer and an entity in the network layer. According to the reference model, these interactions will be performed using DATA.req and DATA.ind primitives.However, to simplify the presentation and to avoid confusion between a DATA.req primitive issued by the user of the transport layer entity, and a DATA.req issued by the transport layer entity itself, we will use the following terminology : the interactions between the user and the transport layer entity are represented by using the classical DATA.req, DATA.ind primitives the interactions between the transport layer entity and the network layer service are represented by using send instead of DATA.req and recvd instead of DATA.ind This is illustrated in the figure below.Transport entity Data.req Data.ind Send Recvd Figure Interactions between the transport layer, its user, and its network layer provider When running on top of a perfect connectionless network service, a transport level entity can simply issue a send(SDU) upon arrival of a DATA.req(SDU). Similarly, the receiver issues a DATA.ind(SDU) upon receipt of a recvd(SDU). Such a simple protocol is sufficient when a single SDU is sent. Unfortunately, this is not always sufficient to ensure a reliable delivery of the SDUs. Consider the case where aclient sends tens of SDUs to a server. If the server is faster that the client, it will be able to receive and process all the segments sent by the client and deliver their content to its user. However, if the server is slower than the client, problems may arise. The transport layer entity contains buffers to store SDUs that have been received as a Data.request from the application but have not yet been sent via the network service. If the application is faster than the network layer, the buffer becomes full and the operating system suspends the application to let the transport entity empty its transmission queue. The transport entity also uses a buffer to store the segments received from the network layer that have not yet been processed by the application. If the application is slow to process the data, this buffer becomes full and the transport entity is not able to accept anymore the segments from the network layer. The buffers of the transport entity have a limited size 2 and if they overflow, the transport entity is forced toMallu Aunty without Saree and Dress
dengudu kathalu telugu, telugu boothu meekosam, puku bommalu telugu, teluguvallaku, dengudu lanjala kathalu, telugu bootu, telugu boothulu, telugu dengudu kathalu, telugu boothu kathulu, puku kathalu telugu pdf, telugu kamasastram, phone lo boothulu, dengudu bommalu kathalu, telugu dengudu kadhalu, telugu pinni dengulata kathalu, aunty kamakeli, bootu bommalu, aunty kathalu, telugu kutha kathalu,This parity scheme has been used in some RAMs as well as to encode characters sent over a serial line. It is easy to show that this coding scheme allows the receiver to detect a single transmission error, but it cannot correct it. However, if two or more bits are in error, the receiver may not always be able to detect the error. Some coding schemes allow the receiver to correct some transmission errors. For example, consider the coding scheme that encodes each source bit as follows : is encoded as 111 0 is encoded as 000 For example, consider a sender that sends 111. If there is one bit in error, the receiver could receive 011 or 101 or 110. In these three cases, the receiver will decode the received bit pattern as a 1 since it contains a majority of bits set to 1. If there are two bits in error, the receiver will not be able anymore to recover from the transmission error. This simple coding scheme forces the sender to transmit three bits for each source bit. However, it allows the receiver to correct single bit errors. More advanced coding systems that allow to recover from errors are used in several types of physical layers. Transport protocols use error detection schemes, but none of the widely used transport protocols rely on error correction schemes. To detect errors, a segment is usually divided into two parts : a header that contains the fields used by the transport protocol to ensure reliable delivery. The header contains a checksum or Cyclical Redundancy Check (CRC) [Williams1993] that is used to detect transmission errors a payload that contains the user data passed by the application layer. Some segment headers also include a length , which indicates the total length of the segment or the length of the payload. The simplest error detection scheme is the checksum. A checksum is basically an arithmetic sum of all the bytes that a segment is composed of. There are different types of checksums. For example, an eight bit checksum can be computed as the arithmetic sum of all the bytes of (both the header and trailer of) the segment. The checksum is computed by the sender before sending the segment and the receiver verifies the checksum upon reception of each segment. The receiver discards segments received with an invalid checksum. Checksums can be easily implemented in software, but their error detection capabilities are limited. Cyclical Redundancy Checks (CRC) have better error detection capabilities [SGP98], but require more CPU when implemented in software.
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ఆంటీ తో మంచం మీద ఒక రాత్రి, The transport layer must deal with the imperfections of the network layer service. There are three types of imperfections that must be considered by the transport layer : Segments can be corrupted by transmission errors Segments can be lost Segments can be reordered or duplicated To deal with these types of imperfections, transport protocols rely on different types of mechanisms. The first problem is transmission errors. The segments sent by a transport entity is processed by the network and datalink layers and finally transmitted by the physical layer. All of these layers are imperfect. For example, the physical layer may be affected by different types of errors : random isolated errors where the value of a single bit has been modified due to a transmission error random burst errors where the values of n consecutive bits have been changed due to transmission errors random bit creations and random bit removals where bits have been added or removed due to transmission errors The only solution to protect against transmission errors is to add redundancy to the segments that are sent. Information Theory defines two mechanisms that can be used to transmit information over a transmission channel affected by random errors. These two mechanisms add redundancy to the information sent, to allow the receiver to detect or sometimes even correct transmission errors. A detailed discussion of these mechanisms is outside the scope of this chapter, but it is useful to consider a simple mechanism to understand its operation and its limitations. Information theory defines coding schemes. There are different types of coding schemes, but let us focus on coding schemes that operate on binary strings. A coding scheme is a function that maps information encoded as a string of m bits into a string of n bits. The simplest coding scheme is the even parity coding. This coding scheme takes an m bits source string and produces an m+1 bits coded string where the first m bits of the coded string are the bits of the source string and the last bit of the coded string is chosen such that the coded string will always contain an even number of bits set.
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telugu aunty boothu kathalu, telugu boothu kathalu, telugu aunty boothu kathalu, kamapisachi telugu boothu kathalu, exbii telugu boothu kathalu, newboard telugu boothu kathalu, tappevaridi telugu boothu kathalu, hansika telugu boothu kathalu, telugu boothu kathalu youtube, telugu boothu kathalu archana. There is as yet no single, commonly-agreed definition of "cloud computing". The United States National Institute of Standards and Technology has defined it as follows "Cloud computing is a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction." Under this definition, the cloud model promotes availability and is composed of five essential characteristics, three delivery models and four deployment models. The five key characteristics of cloud computing are on-demand self service, ubiquitous network access, location-independent resource pooling, rapid elasticity and measured service, all of which are geared towards seamless and transparent cloud use. Rapid elasticity enables the scaling up (or down) of resources. Measured services are primarily derived from business model properties whereby cloud service providers control and optimize the use of computing resources through automated resource allocation, load balancing and metering tools. The three cloud service delivery models (see figure 1) are: Application/Software as a Service (SaaS),Platform as a Service (PaaS) and Infrastructure as a Service (IaaS). ITU Technology Watch published a separate report on the cloud computing phenomenon in March 2009 [15]. These three classic cloud service models have different divisions of responsibility with respect to personal data protection. The risks and benefits associated with each model will also differ, and need to be determined on a case-by-case basis and in relation to the nature of the cloud services in question. SaaS enables the consumer to use the provider’s applications running on a cloud infrastructure. The applications are accessible from various client devices through a client interface such as a web browser (e.g. web-based email such as Gmail or CRM from Salesforce). With the SaaS model, the consumer has little or no influence how input data is processed, but should be able to have confidence in the cloud provider’s responsibility and compliance or can control which input he gives to a SaaS. First of all he can avoid to give sensible data to a SaaS. Secondly he might be able to "secure" the sensible data before he inputs them into the SaaS (e.g. their exists plugins for browsers supporting encryption of input form fields. This could be used to send only encrypted mails using Gmail). PaaS provides tools, supported by a cloud provider, that enable developers to deploy applications (e.g. Salesforce's Force.com, Google App Engine, Mozilla Bespin, Zoho Creator). On the one hand, a big responsibility lies with the developer to use best practices and privacy-friendly tools. On the other hand the developer has to rely on the trustworthiness of the underlying PaaS (and related infrastructure). Assume for instance that some developer has developed a cloud application which encrypts all data before it is stored within the cloud storage provided by the PaaS. In this case the developer has to trust that the platform/infrastructure is not compromised. Otherwise the attacker might get access to the clear text (i.e. before encryption happens) – because he can control the execution environment (e.g. virtual machine monitor, hardware etc.). IaaS provides the consumer with computing resources to run software. One example of IaaS is Amazon EC2 Web Services. An IaaS provider will typically take responsibility for securing the data centres, network and systems, and will take steps to ensure that its employees and operational procedures comply with applicable laws and regulations. However, since an IaaS provider may have little application-level knowledge, it will be difficult for that provider to ensure data-level compliance, such as geographic restriction of data transfers. In this case, the responsibility lies with the cloud user to maintain compliance controls. IaaS is the model that guarantees more direct control but also leaves the customer responsible for the implementation of technical and procedural security and resilience measures [6]. With respect to standardization there.
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