Question 2) Server 2003 Network Infrastructure

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Objective : Implementing, Managing, and Maintaining IP Addressing
SubObjective : Troubleshoot DHCP

Item Number: 70-291.1.4.2
Multiple Answer Multiple Choice

 

You are the network administrator for your company. Your company owns the Class B subnet 190.26.25.0/24. Your network contains five Windows Server 2003 computers and 175 Windows XP Professional computers. More computers will be added to the network within the next year. All computers on your network are configured as DHCP clients.

 

The hard disk on your DHCP server has a fatal error. No backup was made of the server contents. You have no way of retrieving which IP addresses have been distributed throughout the network. You must install a new DHCP server to prevent any connectivity problems. You want to accomplish this with the least amount of administrative effort.
What should you do? (Choose three. Each correct answer presents part of the solution.)

 

A. Create reservations for the five servers.
B. Add an exclusion for the five Windows Server 2003 computers.
C. Set conflict detection attempts to 10 on the new DHCP server.
D. Set conflict detection attempts to one on the new DHCP server.
E. Create a scope that has a range of 190.26.25.1 to 190.26.25.254.
F. Create a scope that has a range of 190.26.25.1 to 190.26.25.200.
G. Create an exclusion for the static IP address used by the DHCP server and reservations for the other four servers.

 

Answer:
D. Set conflict detection attempts to one on the new DHCP server.
E. Create a scope that has a range of 190.26.25.1 to 190.26.25.254.
G. Create an exclusion for the static IP address used by the DHCP server and reservations for the other four servers.

 

Tutorial:
You should create a scope that has a range of 190.26.25.1 to 190.26.25.254 and set conflict detection attempts on the new DHCP server to one. You should also create an exclusion for the static IP address used by the DHCP server and reservations for the other four servers.This scope allows use of the entire range of addresses you have purchased. By setting conflict detection attempts to one, you ensure that a smaller number of pings are used to determine if an IP address is used. Because you lost your prior DHCP database, you must enable some sort of conflict detection or cause every machine to run ipconfig /release then ipconfig /renew to get a new DHCP address. DHCP servers must be configured with static IP addresses, Therefore, the IP address used by the DHCP server must be excluded from the DHCP scope. The other four servers should be assigned IP addresses based on reservations.

 

You should not create reservations for the five servers. One of the servers is a DHCP server. DHCP servers must be configured with static IP addresses.

 

You should not increase conflict detection attempts to 10 on the new DHCP server. The higher the number, the more pings that must be sent to determine if an IP address is available. This will cause the address renewal to take much longer and is therefore not the best option.

 

You should not add an exclusion for the five Windows Server 2003 computers because nothing was mentioned about them having static IP addresses. Exclusion ranges should only be created for IP addresses that are statically configured.

 

You should not create a scope that has a range of 190.26.25.1 to 190.26.25.200. This scope does not include all of the addresses you have purchased.
By default, the DHCP service does not perform any conflict detection. To enable conflict detection, increase the number of ping attempts that the DHCP service performs for each address before leasing that address to a client. Note that for each additional conflict detection attempt that the DHCP service performs, additional seconds are added to the time needed to negotiate leases for DHCP clients. Typically, if DHCP server-side conflict detection is used, you should set the number of conflict detection attempts made by the server to use one or two pings at most. This provides the intended benefits of this feature without decreasing DHCP server performance.

 

If conflict detection is configured, the DHCP server attempts to ping each available address in the scope prior to presenting the address in a lease offer to a client. This ensures that each IP address offered to clients is not already in use by another non-DHCP computer that uses manual TCP/IP configuration.

 

Reference:
1. Windows Server 2003 Help and Support Center – Search
– Best Practices : DHCP

 

2. Windows Server 2003 Help and Support Center – Search
– To enable address conflict detection

 

These questions are derived from the Self Test Software Practice Test for Microsoft Exam #70-291: Implementing, Managing and Maintaining a Microsoft Windows Server 2003 Network Infrastructure.

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