Tcp Analysis Through wiresshark
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This document summarizes how to analyze TCP traffic through the network analyzer tool Wireshark. It discusses TCP connection establishment, the TCP header, display filters to filter packet views, expressions to write filters, following TCP streams, analyzing HTTP traffic, transport layer security, capturing passwords in plaintext, TCP retransmissions, duplicate acknowledgments, improving Wireshark performance, and concludes by thanking the reader.
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Dcn (transmission control protocol) ppt
TCP is a protocol that provides reliable, ordered, and error-checked delivery of data between applications running on hosts communicating via an IP network. It does this using a connection-oriented protocol that establishes a virtual connection between two hosts. TCP implements flow control, ensuring data is sent reliably via acknowledgments and retransmissions if needed. Key aspects of TCP include connection establishment via three-way handshake, packet sequencing and acknowledgments to ensure ordered delivery, and connection termination.
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This document provides an overview of the Transmission Control Protocol (TCP). TCP is a connection-oriented protocol that provides reliable data transmission over the internet by establishing connections between clients and servers, using acknowledgements and retransmissions to ensure reliable delivery of data. It handles data as a byte stream for applications but transmits data in segments over IP networks. The TCP header contains fields like port numbers, sequence numbers, acknowledgement numbers, flags, checksum, and options to support its functions.
User Datagram Protocol
UDP is a transport layer protocol that provides an unreliable datagram service. It is positioned directly above IP in the TCP/IP protocol stack. UDP packets contain a header with source and destination port numbers as well as length fields, but do not establish connections, provide sequencing, or guarantee delivery like TCP. Well-known ports are assigned to common UDP applications like DNS, time synchronization, and trivial file transfer.
T Tcp
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Transport Layer [Autosaved]
Transport layer protocols provide services like reliable data transfer and connection establishment between applications on networked devices. They address this need through protocols like TCP and UDP. TCP provides reliable, ordered data streams using mechanisms like three-way handshake, sequence numbers, acknowledgments, retransmissions, flow control via sliding windows, and connection termination handshaking. UDP provides simple datagram transmissions without reliability or flow control.
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Dcn (transmission control protocol) ppt
TCP is a protocol that provides reliable, ordered, and error-checked delivery of data between applications running on hosts communicating via an IP network. It does this using a connection-oriented protocol that establishes a virtual connection between two hosts. TCP implements flow control, ensuring data is sent reliably via acknowledgments and retransmissions if needed. Key aspects of TCP include connection establishment via three-way handshake, packet sequencing and acknowledgments to ensure ordered delivery, and connection termination.
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This document provides an overview of the Transmission Control Protocol (TCP). TCP is a connection-oriented protocol that provides reliable data transmission over the internet by establishing connections between clients and servers, using acknowledgements and retransmissions to ensure reliable delivery of data. It handles data as a byte stream for applications but transmits data in segments over IP networks. The TCP header contains fields like port numbers, sequence numbers, acknowledgement numbers, flags, checksum, and options to support its functions.
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TCP uses three main control mechanisms:
1. Flow control prevents senders from overrunning receivers using acknowledgments and a sliding window approach.
2. Error control uses retransmission timers and exponential backoff to recover from lost packets.
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- It uses sequence numbers and acknowledgments to ensure reliable and in-order delivery of all bytes. The sender will not overwhelm the receiver due to flow control.
- TCP headers include source/destination ports, sequence numbers, acknowledgments, window size and checksum to establish connections, send data, and implement flow control and reliability.
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Here are the key steps of reverse path broadcasting/multicasting using the example network:
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- TCP is a widely used transport layer protocol that provides reliable, ordered, and error-checked delivery of data between applications running on hosts communicating over an IP network.
- Key TCP features include segment numbering, flow control using sliding windows, error control using checksums and acknowledgements, congestion control, and connection-oriented data transfer.
- TCP guarantees delivery of all bytes in the correct order through mechanisms like retransmission of lost or corrupted segments, discarding of duplicate segments, and temporary buffering of out-of-order segments.
Flow Control
Flow control specifies how much data a sender can transmit before receiving permission to continue. There are two main types of flow control: stop-and-wait and sliding window. Stop-and-wait allows transmission of one frame at a time, while sliding window allows transmitting multiple frames before needing acknowledgement. Sliding window flow control uses variables like window size, last ACK received, and last frame sent to determine how transmission proceeds. It provides more efficiency than stop-and-wait. Automatic repeat request (ARQ) handles retransmission of lost or damaged frames through timeouts, negative acknowledgements, or cumulative acknowledgements depending on the specific ARQ protocol used.
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Traffic-Monitoring.ppt
This document provides an overview of using Wireshark and tcpdump to monitor network traffic. It begins with an introduction to the motivation for network monitoring. It then covers the tools tcpdump, tshark, and Wireshark. Examples are given of using tcpdump and tshark on the command line to capture traffic. The document demonstrates Wireshark's graphical user interface and features like capture filters, display filters, following TCP streams, endpoint statistics, and flow graphs. It concludes with tips for improving Wireshark performance and using grep to analyze saved packet files.
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09 coms 525 tcpip - tcp 2
TCP uses three main control mechanisms:
1. Flow control prevents senders from overrunning receivers using acknowledgments and a sliding window approach.
2. Error control uses retransmission timers and exponential backoff to recover from lost packets.
3. Congestion control prevents senders from overloading the network by adjusting the congestion window based on network feedback.
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The document describes the TCP 3-way handshake process used to establish a connection between a client and server in a TCP/IP network. It involves 3 steps: 1) the client sends a SYN packet to the server with its initial sequence number, 2) the server responds with a SYN-ACK packet containing its own initial sequence number and acknowledging the client's, and 3) the client sends an ACK packet to the server acknowledging its sequence number, completing the handshake and allowing data transfer to begin.
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The document discusses data link control protocols that manage the exchange of data over a communication link. It covers several important topics:
1) Framing involves packing data bits into distinguishable frames using techniques like byte stuffing and bit stuffing.
2) Flow and error control ensure reliable data transmission by preventing buffer overflows and allowing retransmission of corrupted frames. Common methods are stop-and-wait and sliding window protocols.
3) Specific protocols like go-back-N and selective reject are examined, combining framing, flow control, and error handling over noiseless and noisy channels. Utilization rates under different protocols are also calculated.
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This document discusses various data link control protocols. It covers framing, flow and error control, and specific protocols like HDLC and PPP. Framing involves adding structure like headers and trailers to organize data into packets. Flow and error control techniques like stop-and-wait ARQ and sliding window protocols are used to ensure reliable transmission over noisy channels. HDLC is a widely used bit-oriented protocol that defines frame structures and error control. PPP is a point-to-point protocol commonly used for dial-up internet access.
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- TCP is a connection-oriented protocol that establishes a full-duplex connection between two endpoints to deliver a byte stream in order with no message boundaries.
- It uses sequence numbers and acknowledgments to ensure reliable and in-order delivery of all bytes. The sender will not overwhelm the receiver due to flow control.
- TCP headers include source/destination ports, sequence numbers, acknowledgments, window size and checksum to establish connections, send data, and implement flow control and reliability.
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Here are the key steps of reverse path broadcasting/multicasting using the example network:
1. Router S sends the multicast packet and all routers know the shortest path to S is directly through S.
2. Router directly connected to S forwards the packet to all other ports except the port it arrived on (parent port).
3. Subsequent routers forward the packet to all ports except the parent port, following the shortest path to S in reverse.
4. This process continues until all destinations are reached, with each router forwarding only once.
The end result is an efficient multicast distribution tree is built to reach all destinations.
Sliding window protocol
A sliding window protocol allows for reliable packet transmission over data links by assigning each packet a sequence number, tracking acknowledged packets, and allowing a limited number of unacknowledged packets to be transmitted at a time. It provides reliability through mechanisms like resending lost packets, while avoiding issues like unlimited sequence numbers by capping the number of unacknowledged transmittable packets with a window size. This sliding window approach balances reliability with throughput.
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The document provides an overview of the Transmission Control Protocol (TCP). It discusses TCP services like reliable in-order byte stream delivery and flow control using sliding windows. It also covers TCP features like error control using sequence numbers and acknowledgments, congestion control using timers and window sizing, segment formatting and options, checksum calculation, connection establishment and termination, and the TCP state machine.
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This document discusses features of TCP (Transmission Control Protocol):
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- TCP guarantees delivery of all bytes in the correct order through mechanisms like retransmission of lost or corrupted segments, discarding of duplicate segments, and temporary buffering of out-of-order segments.
Flow Control
Flow control specifies how much data a sender can transmit before receiving permission to continue. There are two main types of flow control: stop-and-wait and sliding window. Stop-and-wait allows transmission of one frame at a time, while sliding window allows transmitting multiple frames before needing acknowledgement. Sliding window flow control uses variables like window size, last ACK received, and last frame sent to determine how transmission proceeds. It provides more efficiency than stop-and-wait. Automatic repeat request (ARQ) handles retransmission of lost or damaged frames through timeouts, negative acknowledgements, or cumulative acknowledgements depending on the specific ARQ protocol used.
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Tcp Analysis Through wiresshark
- 1. TCP ANALYSIS THROUGH WIRESHARK STUDENT NAME: SUMAN KUMARI EVALUTORS ENROLMENT NO:9911103574 MS. AARTI JAIN MRS RAJU PAL SUPERVISOR :MR SANJEEV PATEL
- 3. TCP HEADER
- 4. Display Filters (Post-Filters) • Display filters (also called post-filters) only filter the view of what you are seeing. All packets in the capture still exist in the trace • Display filters use their own format and are much more powerful then capture filters
- 5. Display Filter Expressions • snmp || dns || icmp – Display the SNMP or DNS or ICMP traffics. • tcp.port == 25 – Display packets with TCP source or destination port 25. • tcp.flags – Display packets having a TCP flags • tcp.flags.syn == 0x02 – Display packets with a TCP SYN flag
- 6. Follow TCP Stream • red - stuff you sent blue - stuff you get
- 7. Expert Info
- 8. HTTP Analysis – Packet Counter
- 10. Password of unsecure website
- 14. PASSWORD OF UNSECURE WEBSITE
- 15. Improving WireShark Performance • Don’t use capture filters • Increase your read buffer size • Don’t update the screen dynamically • Get a faster computer • Use a TAP • Don’t resolve names
- 16. THANK YOU