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CN2140 Server

CN2140 Server. Kemtis Kunanuraksapong MSIS with Distinction MCT, MCITP, MCTS , MCDST, MCP, A+. Agenda. Chapter 3: Introduction to Networking Concepts Exercise Lab Quiz. Dynamic Host Configuration Protocol (DHCP). Four Key benefits to DHCP: Centralized administration of IP configuration

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CN2140 Server

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  1. CN2140 Server Kemtis Kunanuraksapong MSIS with Distinction MCT, MCITP, MCTS, MCDST, MCP, A+

  2. Agenda • Chapter 3: Introduction to Networking Concepts • Exercise • Lab • Quiz

  3. Dynamic Host Configuration Protocol (DHCP) • Four Key benefits to DHCP: • Centralized administration of IP configuration • Dynamic host configuration • Seamless IP host configuration • Flexibility and scalability

  4. DHCP Terminology • DHCP client • A computer that obtains its configuration information from DHCP • DHCP server • A computer that provides DHCP configuration information to multiple clients • The IP addresses and configuration information that the DHCP server makes available to the client are defined by the DHCP administrator

  5. DHCP Terminology • DHCP lease • The duration for which a DHCP server assigns an IP address to a DHCP client • The lease duration can be any amount of time between 1 minute and 999 days, or it can be unlimited • The default lease duration is eight days

  6. DHCP Messages • All DHCP messages are carried in User Datagram Protocol (UDP) datagrams using port 67 (from the server) and 68 (to the client) • UDP operates at the Transport Layer of the OSI model • A low-overhead protocol because it does not use any type of packet acknowledgement

  7. DHCP Messages (Cont.) • DHCPDISCOVER • DHCPOFFER • DHCPREQUEST • DHCPACK • For least renewal • DHCPREQUEST(Broadcast) • DHCPREQUEST(Unicast) • DHCPACK

  8. DHCP Relay Agent • DHCP relies heavily on broadcast messages • Broadcast messages are generally limited to the subnet • DHCP Relay Agent is a middle man who pass message to/from network components to DHCP server • Using DHCP relay agents eliminates the need to have a DHCP server on every subnet. • See Figure 1-2 on Page 11

  9. Automatic Private IP Addressing (APIPA) • The computer configures itself with a 169.254.0.0/16 address, if DHCP server is unreachable

  10. Installing the DHCP Server Role • Under server manager, adding the DHCP server role • Allows you to configure basic DHCP settings at the same time that you install the role. • On a Server Core Installation of Windows Server 2008, use the following command: Start /w ocsetupDHCPServerCore

  11. Authorizing a DHCP Server • You must authorize a DHCP server in Active Directory before the server can issue leases to DHCP clients • Unauthorized DHCP, known as rogue DHCP server, will not respond to DHCP request • To authorize a DHCP server • In the DHCP console, right-click DHCP -> click Manage Authorized Servers -> select Authorize • Then key the name or IP address of the DHCP server to be authorized -> click OK • The computer will list the IP and full computer name and then ask for confirmation -> Click OK

  12. DHCP Scope • Defines a set of IP addresses and associated configuration information that can be supplied to a DHCP client • The IP addresses must be contiguous and are associated with a subnet mask • Exclude specific addresses or address ranges from the scope, if you want to reserve IP address(es) • You can create only one scope per subnet on a single DHCP server • You can configure multiple scopes on a DHCP server • A scope must be defined and activated

  13. Available Address Pool • Pooled addresses can be dynamically assigned to DHCP clients on the network

  14. Superscope • A DHCP superscope is an administrative grouping of scopes that is used to support multinets, or multiple logical subnets on a single network segment • Superscopes contain only a list of member scopes or child scopes that can be activated together

  15. DHCP Reservation • For DHCP-enabled hosts that need to have static IP addresses on your network • Reservations must be created within a scope and must not be excluded from the scope • Use Media Access Control (MAC) address associated with that IP address to reserve the IP

  16. DHCP Options • Additional client-configuration parameters that a DHCP server can assign when serving leases to DHCP clients • DHCP options are configured using the DHCP console • Can apply to scopes and reservations

  17. DHCP Options • Server options • Apply to all clients of the DHCP server (All scopes) • Use these options for common parameters • Scope options • apply to all clients within a scope • Scope options override server options • Class options • Provide DHCP parameters to DHCP clients based on type • Vendor classes – vendor specific (Can’t be changed) • User classes – DCHP Admin manage • Client options • Apply to individual clients • Client options override all other options

  18. Backup and Restore the DHCP Database • To provide fault tolerance in the case of a failure, it is important to back up the DHCP database • To backup • Right-click the server in the DHCP console and click Backup • To restore the DHCP database • Right-click the server and click Restore • See file associated with DHCP in Table 3-2 on Page 51

  19. Assignment • Summarize the chapter in your own word • At least 75 words • Due BEFOREclass start on Thursday • Lab 3 • Due BEFORE class start on Monday

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