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?

10.3.0.3 (D) Signup and view all the answers

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

10.3.0.0 (B) Signup and view all the answers

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

It reduces network congestion on the WAN (A) Signup and view all the answers

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

To display the IP address of an interface (C) Signup and view all the answers

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

To dynamically hand out IP addresses to devices on the local network (A) Signup and view all the answers

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

To specify the default gateway for clients (B) 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?

The DHCP server will not hand out addresses .1 through .10, nor will it hand out addresses .50 through .254 (D) Signup and view all the answers

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

ip dhcp pool OURPOOL (C) Signup and view all the answers

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

To exclude a range of addresses from the DHCP pool (B) Signup and view all the answers

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

The router will enter DHCP pool configuration mode (B) Signup and view all the answers

Why is the ping to 8.8.8.8 not successful at first?

The service provider device is acting as a port address translation box (A) Signup and view all the answers

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

To display the current DHCP configuration (B) Signup and view all the answers

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

.11 through .49 (C) Signup and view all the answers

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

8.8.8.8 (D) Signup and view all the answers

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

To get additional information about a feature or process on the device (A) Signup and view all the answers

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

show IP DHCP binding (B) Signup and view all the answers

What is the sequence of events in the DORA process?

Discover, Offer, Request, Acknowledgment (B) Signup and view all the answers

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

To debug the DHCP server process on the router (C) Signup and view all the answers

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

10.3.0.11 (C) Signup and view all the answers

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

The DHCP server sends an Offer message (C) Signup and view all the answers

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

To disable debug mode on the router (A) Signup and view all the answers

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

A DHCP client requests an IP address, while a DHCP server assigns an IP address (C) Signup and view all the answers

What is the final step in the DORA process?

The server sends an Acknowledgment message (C) Signup and view all the answers

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

To view the current IP address of the client (B) Signup and view all the answers

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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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