What does the service dhcp command do in router configuration?
Enables the DHCP service
This command must be enabled for the DHCP service to function.
What command is used to configure a router to relay DHCP messages to a DHCP server?
ip helper-address ip_address
This command is used in interface configuration mode.
How do you configure a DHCP pool on a router?
ip dhcp pool name
What command enables you to exclude certain IP addresses to be used from a DHCP pool?
ip dhcp excluded-address <low-address> <high-address></high-address></low-address>
What command enables you to see DHCP conflicts?
show ip dhcp conflicts
What command enables to clear DHCP conflicts?
clear ip dhcp conflict *
What command enables you to see DHCP addresses assigned from the pool?
show ip dhcp binding
What is stateless address autoconfiguration (SLAAC) designed to do?
SLAAC is designed to enable a device to configure its own IPv6 address, prefix, and default gateway without a DHCPv6 server.
How do you enable SLAAC on a router’s interface?
ipv6 address autoconfig
The interface generates a globally routable IPv6 address.
What message do a Windows PC and router send to determine connected routers?
Router Solicitation (RS)
This message is sent to discover any routers on the local link.
What does a router send in response to a Router Solicitation?
Router Advertisement (RA)
The RA identifies the prefix being used by the router.
What information do devices use from the Router Advertisement to generate their own IPv6 address?
Prefix information
This prefix is used to create an IPv6 address in the same network as the router.
For SLAAC, what address does the PC use as the default gateway address?
IPv6 link-local address of the device that sent the RA
This address is used for local communication within the network.
What must be enabled on a router interface for RAs to be generated by default?
- Router interface must be enabled for IPv6
- IPv6 unicast routing must be enabled
- RAs must not be suppressed on the interface
RAs are Router Advertisements, which are part of the IPv6 protocol used for network configuration.
How do you configure a IPv6 DHCP pool?
ipv6 dhcp pool name
address prefix 2001:DB8:A:A::/64
What is stateless DHCPv6 a combination of?
SLAAC and DHCPv6
Stateless DHCPv6 allows clients to automatically determine their IPv6 address and other configurations.
In stateless DHCPv6, clients use a router’s RA to automatically determine which of the following?
- IPv6 address
- Prefix
- Default gateway
RA stands for Router Advertisement, which provides essential network information to clients.
What does the RA include that tells the client to get other non-addressing information from a DHCPv6 server?
A flag
This flag indicates that additional information, such as DNS server addresses, can be obtained from the DHCPv6 server.
To ensure that the RA informs the client to contact a DHCPv6 server for other information, which command must be enabled?
ipv6 nd other-config-flag
This command is crucial for the proper functioning of stateless DHCPv6.
To relay the DHCPv6 messages to a DHCPv6 server in another network, what must be configured on the local router interface?
Configured as a DHCPv6 relay agent
This is done using the ipv6 dhcp relay destination interface configuration command.
When a router is performing a route lookup using CEF, what does the FIB reference?
An entry in the adjacency table
CEF stands for Cisco Express Forwarding, which is a method used by routers to optimize packet forwarding.
What does Proxy ARP allow a router to do?
Respond to ARP requests with its own MAC address
This occurs if the router has a route in the routing table to the IP address in the ARP request.
What IPv6 featurealyzes RAs and filters traffic from unauthorized devices?
RA Guard
How do you configure RA guard?
ipv6 nd raguard attach-policy [policy-name] under interface
