The acknowledgement numbers in the three-way-handshake used by TCP - [CNP3] Computer Networking : Principles, Protocols and Practice | INGInious

en (English) de (Deutsch) el (ελληνικά) es (Español) fr (Français) he (עִבְרִית) nl (Nederlands) nb_NO (Norsk (bokmål)) pt (Português) vi (Tiếng Việt)

Liste des cours S'enregistrer Se connecter

Informations

Auteur(s)	Olivier Bonaventure
Date limite	Pas de date limite
Limite de soumission	Pas de limite
Étiquettes de catégories	tcp

Etiquettes

Se connecter

Veuillez vous enregistrer ou vous connecter pour voir la liste complète des cours et pouvoir soumettrez des réponses aux problèmes.

The acknowledgement numbers in the three-way-handshake used by TCP

The TCP header, shown in the TCP chapter of Computer Networking: Principles, Protocols and Practice contains a sequence number and an acknowledgement number. The three segments below correspond to the three-way handshake that is used to establish a TCP connection.

Copiez-collez cette commande dans votre terminal :

Le mot de pase pour se connecter est

Acknowledgement numbers

Can you infer the acknowledgement numbers of the second and third TCP segments exchanged in the three-way-handshake below ?

#	Taille	Résumé	État
0	24 octets	`Transmission Control Protocol, Src Port: 53712, Dst Port: 1234, Seq: 4207062859, Len: 0`
1	24 octets	`Transmission Control Protocol, Src Port: 1234, Dst Port: 53712, Seq: 4037529898, Ack: ????, Len: 0`
2	20 octets	`Transmission Control Protocol, Src Port: 53712, Dst Port: 1234, Seq: ????, Ack: ????, Len: 0`

0000 d1d004d2fac2af4b 0000000060027080
0010 4f900000020405a0

0000 ÑÐ.ÒúÂ¯K....`.p.
0010 O.......

Transmission Control Protocol, Src Port: 53712, Dst Port: 1234, Seq: 4207062859, Len: 0
- Source Port: 53712
- Destination Port: 1234
- TCP Segment Len: 0
- Sequence number: 4207062859
- 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
- Checksum: 0x4f90 [unverified]
- 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 04d2d1d0f0a7d12a ????????60127080
0010 4f900000020405a0

0000 .ÒÑÐð§Ñ*????`.p.
0010 O.......

Transmission Control Protocol, Src Port: 1234, Dst Port: 53712, Seq: 4037529898, Ack: ????, Len: 0
- Source Port: 1234
- Destination Port: 53712
- TCP Segment Len: 0
- Sequence number: 4037529898
- Acknowledgment number: ?
- 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
- Checksum: 0x4f90 [unverified]
- 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 d1d004d2???????? ????????50107080
0010 4f8c0000

0000 ÑÐ.Ò????????P.p.
0010 O...

Transmission Control Protocol, Src Port: 53712, Dst Port: 1234, Seq: ????, Ack: ????, Len: 0
- Source Port: 53712
- Destination Port: 1234
- TCP Segment Len: 0
- Sequence number: ?
- Acknowledgment number: ?
- 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
- Checksum: 0x4f8c [unverified]
- Urgent pointer: 0