Exercise two

LAB SURVEY

Queen: What is the default directory when you open a new order window? What is your working index? A:

/home/guest/

/home/guest/fangyuliu

Physical exercise 3

LABORATORY REPORT

Queen: Is the Internet service daemon, xinetd, started in your body? Is inetd started in your body? Why?

A: xinetd(extended Net daemon) is started in my system rather than inetd (internet service daemon). Both of them happen to be super-server daemon started just under ask for. Because xinetd is more secure than inetd, more Unix- services at this point replace inetd with xinetd.

Exercise 4

Q: Compare the file ser_more and ser_cp. Are the two of these files the same? A: Yes, they are identical.

Q: Display the file sizes using ls –l ser*. Save the output. What are the sizes of files A: ser_more, ser_cp, and ser_cat?

ser_cat 39870 bytes

ser_cp 19935 bytes

ser_more 19935 byte

LABORATORY REPORT

Q: Submit the ls result you kept.

A:

[[email protected] guest]dollar ls -l ser*

-rw-rw-r-- 1 customer guest 39870 Sep 17 05: 32 ser_cat -rw-r--r-- 1 guests guest 19935 Sep 17 05: 34 ser_cp -rw-rw-r-- 1 customer guest 19935 Sep seventeen 05: 20 ser_more

Exercise 5

arp arping ifconfig tcpdump

ping netstat route ethereal

-----------------------------------------

RESEARCH LABORATORY REPORT

Queen: Explain the above mentioned commands in brief.

A:

arp(address resolution protocol): Displays and modifies addresses resolution arping: Capture ARP packets within the remote equipment.

ifconfig: Configures or perhaps displays network interface guidelines for a network using TCP/IP. tcpdump: Catch and display packets around the LAN part.

ping: Transmits an echo request to a network sponsor.

netstat: Work in conjunction while using ifconfig order to provide a status condition of the TCP/IP network interface. route: Manually manipulate the routing tables.

ethereal: Capture network packets and provide a user friendly graphical user interface and support additional software layer protocols.

Workout 6

LABORATORY REPORT

Q: Draw the format in the packet you saved, such as link, IP, and TCP headers, and identify the value of each discipline in these headers. A:

Hyperlink Header

00: 16: seventy six: a9: 81: ee(Destination Address)| 00: 2009: 5b: 0a: ea: 03(Source Address)| 0x0800(Frame Type: IP)| N/A(Data)| N/A(CRC)

IP header

Variation: 4| Header length: twenty bytes| Differentiated Services Field: 0x10| Total Length: 52| Identification: 0xe535| Flags: 0x04| Fragment offset: 0| Time for you to live: 64| Protocol: TCP (0x06)| Header checksum: 0xcece (correct)| Resource: 128. 238. 66. 104

Destination: 128. 238. sixty six. 107

Option: N/A

Info: N/A

TCP Header

Supply port: 33510 (33510)| Vacation spot port: telnet (23)| Series number: 3192985136

Acknowledgement quantity: 1082427947

Header length: (32 bytes)| Reserved(N/A)| Flags: 0x0011 (FIN, ACK)| Window size: 5840| TCP Checksum: 0x8151 (correct)| Immediate Pointer: N/A

Optional(12 bytes): NOPNOP

Data: N/A

RESEARCH LABORATORY REPORT

Queen: What is the value of protocol field in the IP header in the packet you saved? What is the use of the process field?

A:

The value of process field in the IP header is 0x06 which is TCP. The use of this really is to show the top layer process.

Exercise several

Q: What is the value of the frame type field in an Ethernet body carrying a great ARP ask for and in an Ethernet frame transporting an ARP reply, correspondingly? A: The frame type field within an Ethernet frame carrying an ARP obtain is 0x0806. The framework type discipline in an Ethernet, frame having an ARP reply is 0x0806. Queen: What is the significance of the shape type discipline in an Ethernet, frame holding an IP datagram captured in the previous work out?

A: Shape type field in an Ethernet, frame having an IP is 0x0800.

Q: What is the use of the frame type field?

A: Indicate which process is exemplified in the payload of an Ethernet Frame.

Exercise 8

LABORATORY REPORT

Queen: Explain quickly the functions of the next tcpdump movement. A:

tcpdump udp interface 520: Catch traffic of UDP 520...

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