Reordering the three-way-handshake - [CNP3] Computer Networking : Principles, Protocols and Practice | INGInious

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רשימת קורסים הרשמה כניסה

מידע

יוצרים	Olivier Bonaventure
מועד הגשה	אין מועד הגשה
מגבלת הגשות	אין הגבלה
תגיות קטגוריה	tcp

תגיות

כניסה

נא להירשם או להיכנס כדי לצפות ברשימת הקורסים המלאה כדי שתהיה לך אפשרות להגיש תשובות לבעיות.

Reordering the three-way-handshake

A TCP connection, as explained in the TCP chapter of Computer Networking: Principles, Protocols and Practice always starts with a three-way-handshake.

עליך להדביק את הפקודה הזאת במסוף שלך:

הסיסמה להתחברות אל

Three-way handshake

Can you correctly reorder the three segments that are used to establish a TCP connection ?

#	Length	Summary	Status
0	24 bytes	`Transmission Control Protocol, Src Port: 53718, Dst Port: 1234, Seq: 4119273526, Len: 0`
1	24 bytes	`Transmission Control Protocol, Src Port: 1234, Dst Port: 53718, Seq: 20522819, Ack: 4119273527, Len: 0`
2	20 bytes	`Transmission Control Protocol, Src Port: 53718, Dst Port: 1234, Seq: 4119273527, Ack: 20522820, Len: 0`

0000 d1d604d2f5872036 0000000060027080
0010 00000000020405a0

0000 ÑÖ.Òõ. 6....`.p.
0010 ........

Transmission Control Protocol, Src Port: 53718, Dst Port: 1234, Seq: 4119273526, Len: 0
- Source Port: 53718
- Destination Port: 1234
- Sequence number: 4119273526
- Acknowledgment number: 0
- 0110 .... = Header Length: 24 bytes (6)
- Flags: 0x002 (SYN)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): Not set
  - .... .0.. .... = ECN-Echo: Not set
  - .... ..0. .... = Urgent: Not set
  - .... ...0 .... = Acknowledgment: Not set
  - .... .... 0... = Push: Not set
  - .... .... .0.. = Reset: Not set
  - .... .... ..1. = Syn: Set
  - .... .... ...0 = Fin: Not set
- Window size value: 28800
- Urgent pointer: 0
- Options: (4 bytes), Maximum segment size
  - TCP Option - Maximum segment size: 1440 bytes
    - Kind: Maximum Segment Size (2)
    - Length: 4
    - MSS Value: 1440

0000 04d2d1d601392743 f587203760127080
0010 00000000020405a0

0000 .ÒÑÖ.9'Cõ. 7`.p.
0010 ........

Transmission Control Protocol, Src Port: 1234, Dst Port: 53718, Seq: 20522819, Ack: 4119273527, Len: 0
- Source Port: 1234
- Destination Port: 53718
- Sequence number: 20522819
- Acknowledgment number: 4119273527
- 0110 .... = Header Length: 24 bytes (6)
- Flags: 0x012 (SYN, ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): Not set
  - .... .0.. .... = ECN-Echo: Not set
  - .... ..0. .... = Urgent: Not set
  - .... ...1 .... = Acknowledgment: Set
  - .... .... 0... = Push: Not set
  - .... .... .0.. = Reset: Not set
  - .... .... ..1. = Syn: Set
  - .... .... ...0 = Fin: Not set
- Window size value: 28800
- Urgent pointer: 0
- Options: (4 bytes), Maximum segment size
  - TCP Option - Maximum segment size: 1440 bytes
    - Kind: Maximum Segment Size (2)
    - Length: 4
    - MSS Value: 1440

0000 d1d604d2f5872037 0139274450107080
0010 00000000

0000 ÑÖ.Òõ. 7.9'DP.p.
0010 ....

Transmission Control Protocol, Src Port: 53718, Dst Port: 1234, Seq: 4119273527, Ack: 20522820, Len: 0
- Source Port: 53718
- Destination Port: 1234
- Sequence number: 4119273527
- Acknowledgment number: 20522820
- 0101 .... = Header Length: 20 bytes (5)
- Flags: 0x010 (ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): Not set
  - .... .0.. .... = ECN-Echo: Not set
  - .... ..0. .... = Urgent: Not set
  - .... ...1 .... = Acknowledgment: Set
  - .... .... 0... = Push: Not set
  - .... .... .0.. = Reset: Not set
  - .... .... ..0. = Syn: Not set
  - .... .... ...0 = Fin: Not set
- Window size value: 28800
- Urgent pointer: 0