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CCNA 2 Chapter 8: DHCP, Exams of Nursing

University of OxfordNursing

An overview of the dynamic host configuration protocol (dhcp) in cisco networking. It covers the basics of dhcpv4, including how to configure a cisco router as a dhcp server, client, and relay agent. It also introduces dhcpv6 and the concepts of stateless and stateful dhcp configuration. The dhcp process, the benefits of using dhcp, and the various dhcp-related terminology. It includes step-by-step instructions for configuring dhcp on cisco routers and verifying the dhcp configuration. Additionally, the document discusses the purpose and operation of the dhcp relay agent. Overall, this document serves as a comprehensive guide to understanding and implementing dhcp in a cisco network environment.

Typology: Exams

2023/2024

Available from 09/21/2024

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CCNA 2 Chapter 8: DHCP
Introducing DHCPv4 - correct answer ✔✔DHCPv4:
▪ assigns IPv4 addresses and other network configuration information dynamically
▪ useful and timesaving tool for network administrators
▪ dynamically assigns, or leases, an IPv4 address from a pool of addresses
▪ A Cisco router can be configured to provide DHCPv4 services.
▪ Administrators configure DHCPv4 servers so that leases expire. Then the client must ask for another
address, although the client is typically reassigned the same address.
Configure a Basic DHCPv4 Server - correct answer ✔✔A Cisco router running the Cisco IOS software can
be configured to act as a DHCPv4 server. To set up DHCP:
1. 2. 3.
1 Exclude addresses from the pool.
2 Set up the DHCP pool name.
3 Define the range of addresses and subnet mask. Use the default-router command for the default
gateway. Optional parameters that can be included in the pool - dns server, domain-name.
To disable DHCP, use the no service dhcp command
Verifying DHCPv4 - correct answer ✔✔Commands to verify DHCP:
show running-config | section dhcp show ip dhcp binding
show ip dhcp server statistics
▪ On the PC, issue the ipconfig /all command.
DHCPv4 Relay - correct answer ✔✔▪ Using an IP helper address enables a router to forward DHCPv4
broadcasts to the DHCPv4 server. Acting as a relay.
Configure Cisco router as a DHCP client - correct answer ✔✔R1(config)#int Gi0/0
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CCNA 2 Chapter 8: DHCP

Introducing DHCPv4 - correct answer ✔✔DHCPv4: ▪ assigns IPv4 addresses and other network configuration information dynamically ▪ useful and timesaving tool for network administrators ▪ dynamically assigns, or leases, an IPv4 address from a pool of addresses ▪ A Cisco router can be configured to provide DHCPv4 services. ▪ Administrators configure DHCPv4 servers so that leases expire. Then the client must ask for another address, although the client is typically reassigned the same address. Configure a Basic DHCPv4 Server - correct answer ✔✔A Cisco router running the Cisco IOS software can be configured to act as a DHCPv4 server. To set up DHCP:

1 Exclude addresses from the pool. 2 Set up the DHCP pool name. 3 Define the range of addresses and subnet mask. Use the default-router command for the default gateway. Optional parameters that can be included in the pool - dns server, domain-name. To disable DHCP, use the no service dhcp command Verifying DHCPv4 - correct answer ✔✔Commands to verify DHCP: show running-config | section dhcp show ip dhcp binding show ip dhcp server statistics ▪ On the PC, issue the ipconfig /all command. DHCPv4 Relay - correct answer ✔✔▪ Using an IP helper address enables a router to forward DHCPv broadcasts to the DHCPv4 server. Acting as a relay. Configure Cisco router as a DHCP client - correct answer ✔✔R1(config)#int Gi0/

R1(config-if)#ip address dhcp A Cisco IOS device can be configured to act as: - correct answer ✔✔•a DHCP server - by providing IP addresses when requested to do so •a DHCP client - when it requests an IP address •a DHCP relay agent - when it captures IP requests from clients, adds extra information to the request for user identification purposes, and forwards the request to the DHCP server Create a DHCP IP address pool for the IP addresses you want to use. - correct answer ✔✔1.Create a DHCP IP address pool for the IP addresses you want to use. Router(config)# ip dhcp pool mypool 2.Specify the network and subnet for the addresses you want to use from the pool. Router(dhcp-config)# network 1.1.1.0 / 3.Specify the DNS domain name for the clients. Router(dhcp-config)#domain-name mydomain.com 4.Specify the primary and secondary DNS servers. Router(dhcp-config)#dns-server 1.1.1.10 1.1.1. 5.Specify the default router (i.e., default gateway). Router(dhcp-config)#default-router 1.1.1. 6.Specify the lease duration for the addresses you're using from the pool. Router(dhcp-config)#lease 7 7.Exit Pool Configuration Mode. Router(dhcp-config)#exit Dynamic Host Configuration Protocol (DHCP) - correct answer ✔✔1.The client sends a DHCP Discover message to locate a DHCP server - this is a broadcast message 2.The DHCP server responds with a DHCP Offer unicast message - this message includes the IP address offered to the client, default gateway address and lease time for the IP address offered; it may also include DNS servers, TFTP server, and other information 3.The client responds with a DHCP Request message which is a formal request for the IP address offered by the server - this is again a broadcast message

Exclusion range It Ensures that any IP address listed in that range is not offered by the DHCP server to any DHCP clients. Reservation Creates a permanent address lease assignment from the DHCP server to the client. Reservations ensure that a specified hardware device on the subnet can always use the same IP address ip dhcp excluded-address - correct answer ✔✔First we configure the DHCP server with ip dhcp pool and exclude the ip addresses. R2(config)#ip dhcp pool R1_Pool R2(dhcp-config)#network 10.1.1.0 / R2(dhcp-config)#dns-server 4.2.2. R2(dhcp-config)#default-router 10.4.4. R2(dhcp-config)#exit R2(config)#ip dhcp excluded-address 10.1.1.1 10.1.1. Currently R1's Fa0/0 does not have an IP address R1(config-if)#do show ip interface brief | ex unass Interface IP-Address OK? Method Status Protocol Serial1/0 10.4.4.1 YES manual up up Loopback0 10.0.0.1 YES manual up up After we configure ip address dhcp on R1's Fa0/0, it receives an IP address of 10.1.1. R1(config)#int fa0/ R1(config-if)#ip address dhcp R1(config-if)# *Mar 1 00:40:36.339: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.1.2 (FastEthernet0/0) is down: address changed R1(config-if)# *Mar 1 00:56:44.903: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 10.1.1.100, mask 255.255.255.0, hostname R R1(config-if)# *Mar 1 00:41:21.567: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.1.2 (FastEthernet0/0) is up: new adjacency

R1(config-if)# Stateless Address Autoconfiguration (SLAAC) - correct answer ✔✔A feature of IPv6 in which a host or router can be assigned an IPv6 unicast address without the need for a stateful DHCP server. SLAAC uses ICMPv6 Router Solicitation and Router Advertisement messages to provide addressing and other configuration information that would normally be provided by a DHCP server: SLAAC Operation - correct answer ✔✔A router must have IPv6 routing enabled before it can send RA messages: Router(config)# ipv6 unicast-routing SLAAC Option - correct answer ✔✔SLAAC is the default option on Cisco routers. Both the M flag and the O flag are set to 0 in the RA Stateless DHCPv6 Option - correct answer ✔✔To modify the RA message sent on the interface of a router to indicate stateless DHCPv6, use the following command: Router(config-if)# ipv6 nd other-config-flag Stateful DHCPv6 Option - correct answer ✔✔This option is the most similar to DHCPv4. In this case, the RA message informs the client not to use the information in the RA message. All addressing information and configuration information must be obtained from a stateful DHCPv6 server. Router(config-if)# ipv nd managed-config-flag DHCPv6 Operations - correct answer ✔✔If stateless or stateful DHCPv6 is indicated in the RA message, then the device begins DHCPv6 client/server communications. Configuring a Router as a Stateless DHCPv Server - correct answer ✔✔ipv6 unicast-routing ipv6 dhcp pool pool-name DNS-server dns-server address

ipv6 dhcp pool pool-name command creates a pool and enters the router in DHCPv6 configuration ipv dhcp pool pool-name command creates a pool and enters the router in DHCPv6 configuration mode, which is identified by the Router(config-dhcpv6)# prompt. stateful DHCPv6 all addressing and other configuration parameters must be assigned by the DHCPv server. The address prefix/length command is used to indicate the pool of addresses to be allocated by the server. The ipv6 dhcp server pool-name interface command binds the DHCPv6 pool to the interface. The router responds to stateless DHCPv6 requests on this interface with the information contained in the pool. The M flag needs to be changed from 0 to 1 using the interface command ipv6 nd managed-config-flag. Configuring a Router as a Stateful DHCPv Client - correct answer ✔✔R1(config)#interface g 0/ R1(config-if)#ipv6 enable R1(config-if)#ipv6 address dhcp Show ip interface brief Verifying Stateful DHCPv6 - correct answer ✔✔Show ipv6 dhcp pool Show ipv6 dhcp binding Show ipv6 interface 0/ What is the purpose of DHCP relay agent? - correct answer ✔✔A DHCP client is an Internet host using DHCP to obtain configuration parameters such as an IP address. A DHCP relay agent is any host that forwards DHCP packets between clients and servers. Relay agents are used to forward requests and replies between clients and servers when they are not on the same physical subnet.

  • correct answer ✔✔Router> enable Router# configure terminal

Router(config)# interface g0/ Router(config-if)# ip helper-address 172.16.1. DHCP debugging - correct answer ✔✔DHCPV6#debug ipv6 dhcp IPv6 DHCP debugging is on Verify Router DHCPv6 Configuration - correct answer ✔✔Ipv6 unicast routing Debugging DHCPv6 - correct answer ✔✔Debug ipv6 dhcp detail Explain how DHCPv4 operates in a small- to medium-sized business network - correct answer ✔✔DHCPv4 assigns IPv4 addresses and other network configuration information dynamically. A dedicated DHCPv4 server is scalable and relatively easy to manage. A Cisco router can be configured to provide DHCPv4 services in a small network. Explain the operation of DHCPv6 - correct answer ✔✔DHCPv6 stands for Dynamic Host Configuration Protocol version 6, or Dynamic Host Configuration Protocol for IPv6. DHCPv6 is equivalent of DHCP in IPv4. It is a network protocol for configuring IPv6 clients with IPv6 prefixes and other information required to operate on an IPv6 network. DHCPv6) is a network protocol for configuring Internet Protocol version 6 (IPv6) hosts with IP addresses, IP prefixes and other configuration data required to operate in an IPv6 network. It is the IPv6 equivalent of the Dynamic Host Configuration Protocol for IPv4. IPv6 hosts may automatically generate IP addresses internally using stateless address autoconfiguration (SLAAC), or they may be assigned configuration data with DHCPv6. IPv6 hosts that use stateless autoconfiguration may require information other than an IP address or route. DHCPv6 can be used to acquire this information, even though it is not being used to configure IP addresses. DHCPv6 is not necessary for configuring hosts with the addresses of Domain Name System (DNS) servers, because they can be configured using Neighbor Discovery Protocol, which is also the mechanism for stateless autoconfiguration.[1]