Error Detection

What is Error Detection?

Error detection is a technique used in networking to identify if data has been altered during transmission. It ensures data integrity by detecting corrupted or tampered packets.

Why is Error Detection useful?

It ensures that the data received is the same as what was sent. This is crucial for reliable communication, especially in noisy or unreliable networks.

How does Error Detection work?

It works by using algorithms like checksums, cyclic redundancy checks (CRC), or parity bits. The sender computes a value based on the data, and the receiver recalculates it to verify accuracy.

Where is Error Detection used?

Error detection is used in almost all networking layers and protocols — such as Ethernet, TCP/IP, Wi-Fi, and storage systems — to ensure data integrity.

Which OSI layer does Error Detection belong to?

Error detection can occur at multiple OSI layers — especially at the Data Link Layer (Layer 2) and the Transport Layer (Layer 4).

Is Error Detection Windows specific?

No, error detection is not specific to Windows. It is a fundamental concept implemented in hardware and software across all systems.

Is Error Detection Linux specific?

No, it is universally implemented across all major operating systems, network devices, and communication protocols.

Which Transport Protocol is used by Error Detection?

TCP uses error detection through checksums at the Transport Layer. However, error detection also exists in lower layers like Ethernet (CRC) and IP headers.

Is Error Detection using client-server model?

No, error detection is a communication feature, not a model. It operates independently of client-server architecture to ensure correct data delivery.

Topics in this section,

  • In this section, you are going to learn

  • Terminology

  • Version Info

  • setup

Error Detection - Testcases

S.No

Test Case

Description

Expected Result

1

Null Input

Submit empty input

Error detected: Null input

2

Invalid Format

Input in wrong format

Error detected: Format mismatch

3

Missing Field

Required field missing

Error detected: Missing field

4

Extra Field

Extra field in input

Error detected: Unexpected field

5

SQL Injection

Input contains SQL code

Error detected: Malicious input

6

XSS Attack

Input contains script tags

Error detected: XSS attempt

7

Special Characters

Input has unsupported characters

Error detected: Invalid characters

8

Long Input

Input exceeds max length

Error detected: Input too long

9

Short Input

Input below min length

Error detected: Input too short

10

Incorrect Data Type

Input type mismatch

Error detected: Type error

11

Duplicate Entry

Input already exists

Error detected: Duplicate data

12

Invalid Email

Email format incorrect

Error detected: Invalid email

13

Invalid Date

Date format incorrect

Error detected: Invalid date

14

Future Date

Date is in the future

Error detected: Invalid date

15

Past Date

Date is too old

Error detected: Invalid date

16

Invalid Number

Non-numeric input in numeric field

Error detected: Not a number

17

Negative Number

Negative value in positive-only field

Error detected: Invalid value

18

Zero Value

Zero in non-zero field

Error detected: Invalid value

19

Boundary Value

Value on boundary

Error detected: Boundary violation

20

HTML Tags

Input contains HTML

Error detected: HTML not allowed

21

JSON Malformed

JSON structure broken

Error detected: Invalid JSON

22

XML Malformed

XML structure broken

Error detected: Invalid XML

23

File Upload Error

Corrupt file uploaded

Error detected: File error

24

Unsupported File Type

Wrong file format

Error detected: Unsupported type

25

Large File Upload

File exceeds size limit

Error detected: File too large

26

Timeout Error

Input processing timeout

Error detected: Timeout

27

Network Error

Network failure during input

Error detected: Network issue

28

Unauthorized Access

Input from unauthorized user

Error detected: Access denied

29

Session Expired

Input after session timeout

Error detected: Session expired

30

Invalid Token

Wrong auth token

Error detected: Invalid token

31

Incorrect Password

Wrong password entered

Error detected: Authentication failed

32

Invalid Username

Username not found

Error detected: User not found

33

Blank Spaces

Input only has spaces

Error detected: Empty input

34

Tab Characters

Input contains tabs

Error detected: Invalid characters

35

Unicode Characters

Input has unsupported Unicode

Error detected: Encoding error

36

Case Sensitivity

Wrong case used

Error detected: Case mismatch

37

Logic Error

Input causes logic failure

Error detected: Logic error

38

API Error

API returns error

Error detected: API failure

39

Dependency Failure

External service fails

Error detected: Dependency error

40

Retry Limit Exceeded

Too many retries

Error detected: Retry limit reached

41

Invalid URL

URL format incorrect

Error detected: Invalid URL

42

Broken Link

URL leads to 404

Error detected: Link not found

43

Invalid Phone Number

Wrong phone format

Error detected: Invalid phone

44

Invalid Country Code

Wrong country code

Error detected: Invalid code

45

Invalid Currency

Unsupported currency format

Error detected: Invalid currency

46

Invalid Timezone

Timezone not recognized

Error detected: Invalid timezone

47

Invalid Language Code

Language code not supported

Error detected: Invalid language

48

Invalid Boolean

Non-boolean in boolean field

Error detected: Type mismatch

49

Invalid Enum

Value not in enum list

Error detected: Enum mismatch

50

System Crash

Input causes crash

Error detected: System failure

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