Analysis of an HTTP packet trace

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Câu hỏi 1: A simple HTTP trace

Network engineers often need to capture the packets that are exchanged over a network to debug various types of problems. Here is a simple packet trace

Open this packet trace in wireshark or use tcpdump on the command line determine which of the affirmations below are correct.

The response returned by the server is 62 bytes long.

The client used to retrieve this object is Google Chrome

The client uses HTTP/1.0

The MIME Content-Type of the retrieved web object is text/html

The URL of the retrieved web object is http://nghttp2.org/robots.txt

The server returns a status code of 404 which indicates that the requested object could not be found.

The server returns a status code of 200 which indicates a success.

The response was served by the Apache server

Câu hỏi 2: The HTTP trace

#	Length	Summary
0	20 bytes	`Transmission Control Protocol, Src Port: 44914, Dst Port: 80, Seq: 0, Len: 0`
1	20 bytes	`Transmission Control Protocol, Src Port: 80, Dst Port: 45118, Seq: 0, Ack: 1, Len: 0`
2	20 bytes	`Transmission Control Protocol, Src Port: 45118, Dst Port: 80, Seq: 1, Ack: 1, Len: 0`
3	117 bytes	`Hypertext Transfer Protocol`
4	20 bytes	`Transmission Control Protocol, Src Port: 80, Dst Port: 45118, Seq: 1, Ack: 86, Len: 0`
5	497 bytes	`Hypertext Transfer Protocol`
6	20 bytes	`Transmission Control Protocol, Src Port: 45118, Dst Port: 80, Seq: 86, Ack: 466, Len: 0`
7	20 bytes	`Transmission Control Protocol, Src Port: 80, Dst Port: 45118, Seq: 466, Ack: 86, Len: 0`
8	20 bytes	`Transmission Control Protocol, Src Port: 45118, Dst Port: 80, Seq: 86, Ack: 467, Len: 0`
9	20 bytes	`Transmission Control Protocol, Src Port: 80, Dst Port: 44914, Seq: 0, Ack: 1, Len: 0`
10	20 bytes	`Transmission Control Protocol, Src Port: 44914, Dst Port: 80, Seq: 1, Len: 0`
11	20 bytes	`Transmission Control Protocol, Src Port: 80, Dst Port: 45118, Seq: 467, Ack: 87, Len: 0`

0000 af72005014178133 00000000a0007210
0010 88c20000

0000 ¯r.P...3......r.
0010 .Â..

Transmission Control Protocol, Src Port: 44914, Dst Port: 80, Seq: 0, Len: 0
- Source Port: 44914
- Destination Port: 80
- TCP Segment Len: 0
- Sequence number: 0 (relative sequence number)
- Acknowledgment number: 0
- 1010 .... = Header Length: 40 bytes (10)
- Window size value: 29200
- Calculated window size: 29200
- Checksum: 0x88c2 [unverified]
- Urgent pointer: 0

Tác giả	Olivier Bonaventure
Hạn chót	Không có hạn chót
Giới hạn nộp bài	Không có giới hạn
Các tag chuyên mục	http

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