1 / 22

CCNA DHCP Deepdive N ovember, 2011

CCNA DHCP Deepdive N ovember, 2011. Jaskaran Kalsi & Anton Merckushov Assoc. Technical Managers Europe/ CEE / RCIS Cisco Networking Academy . Agenda. CCNA & DHCP. DHCP Overview. DHCP Self-paced Learning. Interactive Troubleshooting. Summary. Objective.

nita
Download Presentation

CCNA DHCP Deepdive N ovember, 2011

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CCNA DHCP DeepdiveNovember, 2011 Jaskaran Kalsi & Anton Merckushov Assoc. Technical Managers Europe/CEE/RCIS Cisco Networking Academy

  2. Agenda CCNA & DHCP DHCP Overview DHCP Self-paced Learning Interactive Troubleshooting Summary

  3. Objective • Provide a brief review of DHCP. • Demonstrate a brief example of how DHCP can be administered. • Provide a brief description of the troubleshooting scenarios that are available. • Provide an overview of the DHCP IPD offering and its components. • Focus on the use of Packet Tracer as a simulation tool and create an interactive session where the audience troubleshoots and pre-configured network.

  4. DHCP Overview

  5. DHCP & NetAcad CCNA • DHCP is an area that not only students struggle with but also instructors. • DHCP is covered in both CCNA Discovery & Exploration. • CCNA Discovery: • CCNA Discovery 1 - Chapters 5 & 9 • CCNA Discovery 2 - Chapters 5 & 9 • CCNA Exploration: • CCNA Exploration 1 - Chapter 2 • CCNA Exploration 3 - Chapters 2 & 5 • CCNA Exploration 4 - Chapter 7 • RFC 2131

  6. Brief Review of DHCP • Purpose of DHCP in a network… • Static vs. Dynamic • DHCP servers and options • DHCP operation • Example of router IOS DHCP configuration with multiple pools • Useful DHCP related IOS show commands • DHCP issues and troubleshooting tips

  7. Manual vs. Dynamic Addressing • Manual Addressing (static): • Static IP Addresses are typically assigned to routers, servers, and network printers. • Enables remote administration. • Dynamic Address (using DHCP): • Automates assignment of IP address configuration. • Dynamic IP addresses are typically assigned to PC’s, laptops, and other mobile devices. • Facilitates movement of portable devices on the network. • Reduces administrative burden on network staff and virtually eliminates entry errors. • DHCP can be used to allocate IPv4 as well as IPv6 addresses.

  8. Manual vs. Dynamic Addressing

  9. DHCP Options & Servers • A DHCP server typically provides DHCP clients with: • IP Address; Subnet Mask; Default Gateway; DNS server(s); & Lease Time. • Benefits of a Network Server providing DHCP: • More scalable than other solutions. • Offloads DHCP function from network devices. • Relatively easy to manage. • Benefits of a Router providing DHCP: • Simple solution for small branch office or wireless home network. • Less costly because a dedicated DHCP server is not required. • Cisco IOS provides a DHCP server in routers and multilayer switches.

  10. DHCP Server Types & Locations

  11. DHCP Operation • Client broadcasts a Discovery message. • Server responds with a potential IP address offer. • Client sends request to use the suggested address. • Server responds with an acknowledgment.

  12. IOS DHCP Example: Multi-pool Topology

  13. IOS DHCP Example: Multi-pool Config R1(config)# ipdhcp excluded-address 192.168.10.1 192.168.11.9 R1(config)# ipdhcp excluded-address 192.168.10.254 R1(dhcp-config)# ipdhcp pool LAN-POOL-1 R1(dhcp-config)# network 192.168.10.0 255.255.255.0 R1(dhcp-config)# default-router 192.168.10.1 R1(dhcp-config)# domain-name span.com R1(config)# ipdhcp excluded-address 192.168.11.1 192.168.11.9 R1(config)# ipdhcp excluded-address 192.168.11.254 R1(dhcp-config)# ipdhcp pool LAN-POOL-2 R1(dhcp-config)# network 192.168.11.0 255.255.255.0 R1(dhcp-config)# default-router 192.168.11.1 R1(dhcp-config)# domain-name span.com

  14. Useful DHCP IOS show Commands

  15. Useful DHCP IOS show Commands

  16. DHCP Troubleshooting Process • Task 1: Resolve IP address conflicts. • R2# show ipdhcp conflict • IP address Detection Method Detection time • 192.168.1.32 Ping Feb 16 2011 12:28 PM • 192.168.1.64 Gratuitous ARP Feb 23 2011 08:12 AM • Task 2: Verify physical connectivity. • R2# show interface type/number • Task 3: Configure client with static address and test connectivity. • Task 4: Verify Switch Port Configuration (STPPortfast & Other Commands)

  17. DHCP Troubleshooting Process • Task 5: Verify DHCP server information with client/server on the same subnet. Issues can include: • Incorrect information being provided by the DHCP server. • Service not enabled on DHCP server. • Client not set up as DHCP client. • Rogue DHCP server in the subnet. • Task 6: Verify DHCP communication between client/server on different subnets. Issues can include: • DHCP relay issues. • IP helper address missing or incorrectly configured.

  18. Troubleshooting Examples

  19. DHCP Self Paced Learning

  20. DHCP: Self Paced Learning • Developed by Cisco IPD Team for use by CCNA-level instructors. • Uses a scenario-based trouble ticket problem and resolution approach with Packet Tracer simulations. • Configure/correct problems in order for the network to function. • Helps reinforce an instructor’s understanding of various protocols and technologies, in this case DHCP. • Provides multiple preconfigured PT troubleshooting scenario topologies with good/bad PT files for each trouble tickets. • First two pages of the guides available for each scenario can be used as a student assignment.

  21. DHCP: Self Paced Learning DEMO

More Related