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Review Quiz

  1. How does DHCP differ from manual configuration of network settings?
  2. What DHCP configuration information can be delivered via Mac OS X Server?
  3. How do lease times affect DHCP address assignment?
  4. Why might a client fail to receive a DHCP address, including renewal issues?
  5. What are the global and local aspects of DNS architecture?
  6. What three possible steps can you take when investigating a DNS problem?
  7. What are two benefits of setting up a Software Update server?


  1. DHCP is a way to provide an entire network of computers with IP addresses by means of a central server. Manually configuring network settings requires that an administrator (or user) type proper IP address information for each and every computer on the network.
  2. IP address, subnet mask, router, DNS server, default domain, WINS server, and LDAP server.
  3. The lease time is the minimum amount of time for which a client has use of an IP address without explicitly releasing the address. If a lease has not expired and the client has not released the address, the DHCP server does not reassign that address. Thus, if you set lease time to a year, and a client computer permanently leaves the network, that computer's IP address is potentially unavailable for up to a year.
  4. Reasons could include a misconfigured DHCP server, network problems that prevent the DORA exchange, and the DHCP server and client being on different subnets. If the DHCP server becomes unavailable after the client obtains an address, the client will be fine throughout the lease time. If the DHCP server is still unavailable at the end of the lease time, the client should stop using that IP address, either by shutting down IP altogether or by using a private, nonroutable address.
  5. DNS is a distributed system. It is local in that each separate domain is responsible for its own configuration, so that domain configuration files are located on multiple DNS servers across the Internet. It is global in that all the separate domains are integrated into one unified system in which queries are handled by the responsible name server and all clients can obtain correct name resolution from anywhere on the Internet.
  6. You can:
    1. Verify network settings.
    2. Use Network Utility to test for forward and reverse lookups.
    3. Use Network Utility to ping the DNS server.
    4. Use Network Utility to test for basic IP connectivity by pinging another device on the subnet.
  7. By setting up a Software Update server, you can control which updates are available to clients on your local network. It also reduces bandwidth demands to the Internet, as updates are downloaded from Apple once and then re-served across the local network as often as needed.
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