Ch31-Implementing IPv6 on Hosts Flashcards
A protocol that is part of the IPv6 protocol suite, used to discover and exchange information about devices on the same subnet. In particular, it replaces the IPv4 ARP protocol
Neighbor Discovery Protocol (NDP)
A message defined by the IPv6 Neighbor Discovery Protocol, used by routers to announce their willingness to act as an IPv6 router on a link.
Router Advertisement (RA)
A message defined by the IPv6 Neighbor Discovery Protocol, used to ask any routers on the link to reply, identifying the router, plus other configuration settings (prefix and prefix length)
Router Solicitation (RS)
A message defined by the IPv6 Neighbor Discovery Protocol, used to declare to other neighbors a host’s MAC address.
Neighbor Advertisement (NA)
A message defined by the IPv6 Neighbor Discovery Protocol, used to ask a neighbor to reply with a message listing the neighbor’s MAC address
Neighbor Solicitation (NS)
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
Stateless Address Autoconfiguration (SLAAC)
A term used in IPv6 to refer to how hosts first check whether another host is using a unicast address before the hosts begins using that address
Duplicate Address Detection (DAD)
The IPv6 equivalent of the IPv4 ARP table, listing IPv6 addresses of hosts on the same link, along with their matching MAC addresses, as typically learned using Neighbor Discovery Protocol
ipv6 neighbor table
A term used in IPv6, describing a DHCP service that doesn’t lease IPv6 addresses to clients, or track their IPv6 addresses or client identifiers, but may provide other useful information, such as the clients DNS server settings
stateless DHCPv6
A term used in IPv6, describing a DHCP service that keeps track of which clients have been lease associated IPv6 addresses
stateful DHCPv6
Command reference: Interface subcommand that enables the IPv6 DHCP relay agent
ipv6 dhcp relay destination address
Command reference: Lists the router’s IPv6 neighbor table
show ipv6 neighbors
Command reference: Lists any neighboring routers that advertised themselves via an NDP RA message
show ipv6 routers
What command produced the following output:
show ipv6 neighbors
What command is used to enable a router interface to act as a DHCP relay agent?
ipv6 dhcp relay destination dhcpv6-server-address
List four functions in which NDP plays a major role
Router discovery
SLAAC
Neighbor MAC discovery (solicitation/like ARP)
Duplicate address detection
Router solicitation messages are sent to this multicast address
all-routers multicast FF02:2
Unsolictited router advertisement messages (RA) are sent to this multicast address
all-nodes, FF02::1
What addresses are solicited router advertisement messages are sent to?
Unicast address of solicitor
all-nodes FF02::1
An IPv6 host needs to send data to a host on the same link, but does not know that hosts link-layer (MAC) address. IPv4 hosts would ARP for that information. An IPv6 host will instead send a neighbor solicitation message (NS) instead. To what local-scope address will the NS message be sent?
The solicited node multicast address of the target (FF02::1:FFxx:xxxx, where xx:xxxx are the last 6 hex digits of the destination unicast address).
An IPv6 host sends a router solicitation to locate it’s default router. What will be returned in the router advertisement?
Link-local address of the default router for the link
How does a SLAAC host determine its prefix and prefix length?
Solicit router; router advertisement contains the prefix/prefix length for the link.
What particular information would a client learn from a stateful DHCP server? What would it need to learn from some other source?
Stateful DHCPv6:
Unicast address
prefix/prefix length
DNS server
NDP process:
default router
Describe the events in the SLAAC process
- learn link prefix via NDP RS+RA
- calculate interface ID (EUI-64, random)
- Perform DAD via NS+NA prior to using address
