0000 Life Wireless 2:08 AM × Chapter3 Assignment-1.pdf 1 of 2 Chapter 3-How Data

Question

0000 Life Wireless 2:08 AM × Chapter3 Assignment-1.pdf 1 of 2 Chapter 3-How Data Is Transported Over Networks Questien1 Using your own woeds reflect what you have learned in this chapter. W'ith a misimum of 1s words, write your summary using Microsoft Woed Question 2 Project 3-1: Repair a Duplicate IP Address brcak the computer. Then you se how the arp comand helge you dagose the problem it Wrine down this 2. Open the Network and Sharing Ceme,click Change adapter scttings,nghe-click the act we network connotan, and cik hprta no essary, enter an admantator pawwond is the LIAC bos and click Y Sele nternet Prosocol Vesion4(TCMP4 an ik Properies Set the IP address to maticaly assigs the Subnet mask, as shown in Figare 3-21 Click OK Figure 3-21 ubnemank field asigned automatically Back ar the command promp, enter ipcontig /a11 Find the appropriate network connection and identify your computer's cuerene Ivd address Has your compuner ilenafed the duplicate IP address peoblem ye? Your computer may abo have autoconfgured anotheraddress. If so, what addres your computer resoet to d 6. the window on the left side of Figure 3.22, you can see a warning that the IP address is a duplicate. The system aso shows a preferred Pv4 addres of 169 254 181.132 Open With Print

Explanation / Answer

Duplicate IP addresses can pose a challenge for network administrators. Fortunately, there are methods to detect duplicate IP addresses and resolve these issues.

IP address conflicts.

IP address conflicts occur when two devices on a network are assigned the same IP address, resulting in one or both being disabled and losing connectivity until the conflict is resolved. IP address conflicts are often the result of configuration errors including: assignment of the same static IP address by a network administrator; assignment of a static IP address within the DHCP range (dynamic range) resulting in the same address being automatically assigned by the local DHCP server; an error in the DHCP server; or a system coming back online after an extended period in stand-by or hibernate mode with an IP address that has been reassigned and is in use on the network.

Community member Sudhanshu recommends sending ARP packets to that IP address in order to detect the duplicate IT address. All machines with same IP will revert with the MAC address. If you are using a security solution, he recommends blocking those MAC addresses. If you are using tools to manage your assets, you can also use those to detect which users have the duplicate IPs. Nmap is a useful network scanning tool, as this Community member points out. You can use Nmap for an ARP scan on the local subnet.
Community member BlankReg explains that if you are using a Cisco router, you will find that the router sends an ARP for its own IP address when it connects to a network, or when the IP address is changed, so this will allow for detection of duplicate IP addresses.

According to information on Microsoft's support website, all Microsoft TCP/IP protocols currently shipping can detect duplicate IP addresses in most cases.

Scenario 1
A static IP address is defined for a network device, for example, a printer. When you install a DHCP server, duplicate IP address conflicts may occur between the network device and a DHCP client computer (running Windows for Workgroups or Windows NT)

Scenario 2
You manually define static IP addresses for network devices and computers during a network link failure to a DHCP server. When the link is then reestablished, the conflict occurs.

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