Ordered Delivery

What is Ordered Delivery?

Ordered delivery ensures that data packets arrive at the destination in the exact sequence they were sent, preserving the correct order of information.

Why is Ordered Delivery useful?

It is essential for applications where the order of data impacts correctness, such as file transfers, video streaming, and real-time communication.

How does Ordered Delivery work?

Protocols like TCP assign sequence numbers to packets and use acknowledgments to ensure packets are received and processed in the right order, buffering out-of-order packets if needed.

Where is Ordered Delivery used?

It is used in applications like HTTP, FTP, and VoIP where maintaining the order of transmitted data is critical for proper functionality.

Which OSI layer manages Ordered Delivery?

Ordered delivery is managed at the Transport Layer (Layer 4) of the OSI model.

Is Ordered Delivery Windows specific?

No, ordered delivery mechanisms like those in TCP are implemented on all major operating systems, including Windows, Linux, and macOS.

Is Ordered Delivery Linux specific?

No, Linux fully supports ordered delivery through its TCP/IP stack.

Which Transport Protocol provides Ordered Delivery?

The transport protocol that provides ordered delivery is TCP (Transmission Control Protocol).

Is Ordered Delivery used in client-server models?

Yes, ordered delivery is critical in client-server communication to ensure data integrity and proper session handling.

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Ordered Delivery - Testcases

S.No

Test Case

Description

Expected Result

1

Sequential Packets

Send packets in order

Packets received in same order

2

Out-of-Order Packets

Simulate out-of-order delivery

TCP reorders packets correctly

3

Packet Loss

Drop a packet mid-sequence

Retransmission ensures correct order

4

Duplicate Packets

Send duplicate packets

Duplicates discarded, order preserved

5

Delayed Packet

Delay one packet

TCP waits and reorders correctly

6

Fragmented Data

Send fragmented data

Reassembled in correct order

7

Large Data Stream

Send large stream

Data received in correct sequence

8

Small Data Stream

Send small stream

Order maintained

9

Mixed Packet Sizes

Vary packet sizes

Order preserved

10

ACK Delay

Delay acknowledgments

TCP maintains order

11

ACK Loss

Lose ACKs

Retransmission preserves order

12

Retransmission

Retransmit lost packet

Order restored

13

Congestion

Simulate congestion

TCP slows down but maintains order

14

Flow Control

Receiver limits flow

Order maintained

15

Window Size Change

Change TCP window size

Order unaffected

16

Connection Pause

Pause and resume connection

Order preserved

17

Connection Reset

Reset mid-transfer

Order lost, connection restarted

18

Multiple Connections

Multiple TCP streams

Each stream maintains its own order

19

NAT Traversal

Send through NAT

Order preserved

20

Proxy Routing

Send through proxy

Order preserved

21

VPN Routing

Send through VPN

Order preserved

22

Packet Reordering by Network

Network reorders packets

TCP reorders them correctly

23

Packet Duplication by Network

Network duplicates packets

TCP discards duplicates

24

Packet Delay by Network

Network delays packets

TCP buffers and reorders

25

Packet Loss by Network

Network drops packets

TCP retransmits and reorders

26

TCP Reno Behavior

Use Reno algorithm

Order maintained

27

TCP Cubic Behavior

Use Cubic algorithm

Order maintained

28

TCP BBR Behavior

Use BBR algorithm

Order maintained

29

TCP Tahoe Behavior

Use Tahoe algorithm

Order maintained

30

Application-Level Check

App verifies order

Data matches expected sequence

31

Header Manipulation

Modify TCP headers

Order preserved if headers valid

32

Sequence Number Wraparound

Sequence number exceeds max

TCP handles wraparound correctly

33

Sequence Number Collision

Simulate collision

TCP resolves and maintains order

34

Stream Termination

End stream with FIN

Final data received in order

35

Stream Restart

Restart stream

New stream starts fresh order

36

Keep-Alive Enabled

Maintain idle connection

Order preserved after idle

37

Keep-Alive Disabled

Idle connection closed

Order lost after termination

38

TLS Encrypted Stream

Encrypt data

Decrypted data in correct order

39

Compressed Stream

Compress data

Decompressed in correct order

40

Multithreaded Sender

Send from multiple threads

TCP serializes and preserves order

41

Multithreaded Receiver

Receive on multiple threads

TCP delivers in order

42

Mobile Network

Send over mobile data

Order preserved despite jitter

43

Satellite Network

Send over satellite

Order preserved despite latency

44

IoT Device Communication

Send from IoT device

Order maintained

45

Cloud Server Communication

Send to cloud server

Order preserved

46

Firewall Traversal

Send through firewall

Order preserved

47

IDS Monitoring

Monitor for order violations

No violations detected

48

Logging Enabled

Log packet sequence

Logs show correct order

49

Logging Disabled

No logs

Order verified manually

50

Stress Test

High volume, high speed

TCP maintains ordered delivery

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