Cisco® CCENT Exam Cram Notes : TCP And UDP Frames


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1. Networking Fundamentals

1. OSI and DoD Models

1.4. TCP and UDP Frames :

The frames for both TCP and UDP are as given below:

TCP Frame:

TCP Frame

TCP frame fields: Total 20 bytes long.

1. Sequence Number

2. AcK number

3. Data offset

4. Reserved

5. Control bit

6. Window

7. Urgent Pointer

8. Options

9. Padding

10. Check Sum

11. Source port

12. Destination port

UDP Frame:

UDP Frame

UDP frame fields: Total 8 bytes long.

1. Length

2. Source port

3. Destination port

4. Check Sum

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