Cisco Router DHCP Services Implementation
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Questions and Answers

What is the primary reason for implementing DHCP services at a remote site?

  • To increase network security
  • To provide a static IP address to all devices
  • To reduce network congestion on the WAN (correct)
  • To allow remote users to access the internet

    • Which of the following devices can be configured as a DHCP server?

  • Router at site 1
  • Router at site 2
  • Router at site 3 (correct)
  • All of the above

    • What command is used to display the IP address and subnet mask of an interface?

  • show ip (correct)
  • show ip interface
  • show ip interface brief
  • show ip address

    • What is the IP address of the gigabit 0/1 interface on the router at site 3?

    <p>10.3.0.3</p> Signup and view all the answers

    What is the network address of the gigabit 0/1 interface on the router at site 3?

    <p>10.3.0.0</p> Signup and view all the answers

    What is the primary advantage of using a router as a DHCP server?

    <p>It reduces network congestion on the WAN</p> Signup and view all the answers

    What is the purpose of the 'show ip interface brief' command?

    <p>To display the IP address of an interface</p> Signup and view all the answers

    Why is it necessary to configure a DHCP server at a remote site?

    <p>To dynamically hand out IP addresses to devices on the local network</p> Signup and view all the answers

    What is the purpose of the 'default router' option in the DHCP configuration?

    <p>To specify the default gateway for clients</p> Signup and view all the answers

    What is the result of excluding the addresses 10.3.0.1 through 10.3.0.10 from the DHCP pool?

    <p>The DHCP server will not hand out addresses .1 through .10, nor will it hand out addresses .50 through .254</p> Signup and view all the answers

    What is the command used to enter DHCP pool configuration mode on the Cisco router?

    <p>ip dhcp pool OURPOOL</p> Signup and view all the answers

    What is the purpose of the 'ip dhcp excluded-address' command?

    <p>To exclude a range of addresses from the DHCP pool</p> Signup and view all the answers

    What is the result of the command 'ip dhcp pool OURPOOL'?

    <p>The router will enter DHCP pool configuration mode</p> Signup and view all the answers

    Why is the ping to 8.8.8.8 not successful at first?

    <p>The service provider device is acting as a port address translation box</p> Signup and view all the answers

    What is the purpose of the 'show run section dhcp' command?

    <p>To display the current DHCP configuration</p> Signup and view all the answers

    What is the range of addresses that the DHCP server will hand out to clients?

    <p>.11 through .49</p> Signup and view all the answers

    What is the IP address of the DNS server specified in the DHCP configuration?

    <p>8.8.8.8</p> Signup and view all the answers

    What is the primary purpose of using debugs in a Cisco device?

    <p>To get additional information about a feature or process on the device</p> Signup and view all the answers

    What is the command to view the current DHCP bindings on the router?

    <p>show IP DHCP binding</p> Signup and view all the answers

    What is the sequence of events in the DORA process?

    <p>Discover, Offer, Request, Acknowledgment</p> Signup and view all the answers

    What is the purpose of the 'debug IP DHCP server packets' command?

    <p>To debug the DHCP server process on the router</p> Signup and view all the answers

    What is the IP address of the Florida PC client in the demonstration?

    <p>10.3.0.11</p> Signup and view all the answers

    What is the result of the DHCP client sending a Discover message to the DHCP server?

    <p>The DHCP server sends an Offer message</p> Signup and view all the answers

    What is the purpose of the 'undebug all' command?

    <p>To disable debug mode on the router</p> Signup and view all the answers

    What is the main difference between a DHCP client and a DHCP server?

    <p>A DHCP client requests an IP address, while a DHCP server assigns an IP address</p> Signup and view all the answers

    What is the final step in the DORA process?

    <p>The server sends an Acknowledgment message</p> Signup and view all the answers

    What is the purpose of the 'ifconfig' command in the demonstration?

    <p>To view the current IP address of the client</p> Signup and view all the answers

    Study Notes

    Implementing DHCP Services on a Cisco Router

    • Using the right tool for the right job is important, and in this scenario, having a remote router or firewall act as a DHCP server for the local network makes sense instead of sending DHCP services over a slow wide area network.

    • The scenario involves a remote branch office with a router and a PC, and the goal is to configure the router to act as a DHCP server to dynamically hand out IP addresses to the PC.

      Not all routers are capable of functioning as a DHCP server. However, many modern routers designed for small business or home use do include DHCP server functionality as a standard feature. It's always best to check your router's specifications or user manual to determine if it can support DHCP server capabilities.

      Enterprise-level routers or older, basic routers may not have DHCP server functionality built-in. These types of routers may require manual configuration of DHCP services through an external server or device.

    Configuring the Router

    • The router is configured to be a DHCP server using the command IP DHCP pool and naming the pool (e.g., OURPOOL).
    • The network command is used to specify the network address space (e.g., 10.3.0.0/24) that the router will support as a DHCP server.
    • Exclusions can be set up using the IP DHCP excluded-address command to exclude certain IP addresses from being handed out (e.g., 10.3.0.1-10 and 10.3.0.50-254).

    Specifying Options

    • The default-router option is used to specify the default gateway that clients should use (e.g., 10.3.0.3).
    • The DNS option is used to specify the DNS server that clients should use (e.g., 8.8.8.8).

    Verifying Connectivity

    • Before configuring the DHCP server, it's essential to verify that the router has connectivity to the internet using the ping command (e.g., ping 8.8.8.8).
    • If the ping is not successful, it may be necessary to check the port address translation (PAT) configuration.

    Debugging and Testing

    • Debugging can be used to get additional information about the DHCP process on the router using the debug command (e.g., debug IP DHCP server packets).
    • The show IP DHCP command can be used to display the current bindings and verify that the DHCP server is working correctly.
    • The DORA process (Discover, Offer, Request, Acknowledgment) is used to verify that the DHCP server is working correctly.

    Conclusion

    • The demonstration showed how to configure a Cisco router to act as a DHCP server and verify that it's working correctly using a client.
    • The same concept can be applied to other devices, such as a firewall, to implement DHCP services.

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    Description

    Learn how to configure a Cisco router to act as a DHCP server, dynamically assigning IP addresses to devices on a local network. This scenario is particularly useful for remote branch offices.

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