Bob obtained the following information from a workstation: C:\\>ipconfig Etherne
ID: 647299 • Letter: B
Question
Bob obtained the following information from a workstation: C:>ipconfig
Ethernet adapter Local Area Connection:
IP Address. . . . . . . ... . : 169.254.10.105
Subnet Mask . . . . . . ... : 255.255.0.0
Default Gateway . . . . ..:
Link-Local IPv6 Address..fe80::9890:96ff:fea1:53ed%12
a. Explain everything that can be determined about this host.
After waiting 5 minutes and making no changes to his workstation. Bob obtained the following information from his workstation.
C:>ipconfig
Ethernet adapter Local Area Connection:
IP Address. . . . . . . . : 138.110.10.50
Subnet Mask . . . . . . .. : 255.255.0.0
Default Gateway . . . .. : 138.110.10.1
Link-Local IPv6 Address..fe80::9890:96ff:fea1:53ed%12
How would you explain the changes to the IP stack? Explain in detail what occurred.
Explanation / Answer
First of all understand the terms:
IPconfig (internet protocol configuration):
It is a command in Microsoft-Windows that displays all current TCP/IP network configuration values and can modify Dynamic Host Configuration Protocol (DHCP) and Domain Name System DNS settings. Ipconfig command is most often used to diagnose network problem on a Windows machine.
Ipconfig is an external MS-DOS command, and is available on Windows 95, Windows 98, ME, NT, 2000, XP and Windows Vista Operating Systems. On Windows 9x machines, a graphical tools such as winipconifg or winipcfg may be used instead. On Linux machine, the ifconfig command performs equivalent function.
IP Address (Internet Protocol address):
IP address is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.
There are two versions of this address is present now:
For example: 169.254.0.0 (dotted decimal notation)
For example: fe32:2345:de23:0000:dacb:abef:1234:fa45 (hexadecimal notation)
Subnet Mask:
It is a mathematical tool which is used to solve networking problems. Number of bits are same as that of IP address.
Default Gateway:
The node on the computer network that the network software uses when an IP address does not match any other routes in the routing table is called default gateway.
Local-Link IPv6 Address:
A link-local address is an IPv6 unicast address that can be automatically configured on any interface using the link-local prefix FE80::/10 (1111 1110 10) and the interface identifier in the modified EUI-64 format. Link-local addresses are not necessarily bound to the MAC address.
Zone or Ifindex:
The IPv6 Link-Local Address is local on the link (interface) and the node has several links (interfaces) - all with the same IPv6 Link-Local prefix. Because of this it's necessary to identify the Link in question. For example the Link-Local address from below fe80::221:86ff:fea0:ce84%12 where fe80::221:86ff:fea0:ce84 is the address and %12 is the Zone identifier which identifies the Link. In this case interface 12 is the "Local Area Connection". Which is your Ethernet adapter.
Now I describe what can be determined from the information given by IPConfig:
2. Subnet Mask . . . . . . ... : 255.255.0.0
3. Default Gateway . . . . ..:
4. Link-Local IPv6 Address..fe80::9890:96ff:fea1:53ed%12
fe80::9890:96ff:fea1:53ed is the address and %12 is the Zone identifier which identifies the Link. In this case interface 12 is the "Local Area Connection”.
After waiting 5 minutes and making no changes to his workstation. Bob obtained the following information from his workstation.
C:>ipconfig
Ethernet adapter Local Area Connection:
IP Address. . . . . . . . : 138.110.10.50
Subnet Mask . . . . . . .. : 255.255.0.0
Default Gateway . . . .. : 138.110.10.1
Link-Local IPv6 Address..fe80::9890:96ff:fea1:53ed%12
Information obtained is: