6 Day 6 Flashcards
What are the three parts of an IPv6 Global Unicast Address?
Global Routing Prefix
Subnet ID
Interface ID
Ipv6 addresses can be classified into what three categories?
Unicast
Multicast
Anycast
Convert the MAC address 00:0C:29:50:BF:B4
020C:29FF:FE50:BFB4
Expand the abbreviated IPv6 address FE80::202:B3FF:FE1E:8329
FE80:0000:0000:0000:0202:B3FF:FE1E:8329
What three methods are used to transition from IPv4 to IPv6?
Dual stacking
Tunneling
Translation
Ipv6 Unique Local addresses are the equivalent to what IPv4 addresses?
Private
Multicast traffic is restricted to sphere of influence called ___________.
Scopes
NDP function where Multicast neighbor solicitations are sent for a host’s own IPv6 before attempting to use that address to communicate if a neighbor is already using that address and the host will not use it.
Duplicate Address Detection
NDP function where MTU allows hosts to decide what size packets to use; usually set to 1500 bytes for Ethernet networks.
Parameter Discovery
NDP function where NDP is able to determine reachability of a neighbor. If discovered info is stored in a cache and tracked.
Neighbor Unreachability Detection
NDP function where routers use ICMPv6 redirect messages to inform hosts of more preferable routes.
Redirection
NDP function where hosts can automatically configure themselves with an IPv6 address.
Address Autoconfig
NDP function where hosts can automatically locate their default gateways: Accomplished by using two ICMPv6 multicast messages to all routers. Routers respond with an ad w/ its address to the All Nodes multicast address. FF02::2 FF02::1
Router Discovery
NDP functions that allows a host to select a default router.
Next-Hop Determination
NDP function that contains prefix information, which is simply IPv6 subnet info for the local link.
Prefix Discovery
NDP function that is similar to router discovery; 2 ICMPv6 messages are used.
Host needing to know physical address sends a neighbor solicitation message.
Neighbor then sends physical address in a neighbor advertisement response message.
Address Resolution
Unicast addresses assigned to more than one interface and typically on different hosts; Delivered to only one interface usually the closest.
Anycast
Uniquely identifies an interface; packets sent are delivered only to the identified interface
Everything less than FF00
Unicast
Can be used instead of broadcast; primarily designed for specific groups of devices
FF02::1 All Nodes
FFo2::2 All Routers
Multicast
!Pv6 Address length:
128 bits
16 bytes
8 segments
Multicast Traffic is restricted to scopes. Restrict multicast traffic to a specific organization, site or link.
Address Prefix - FF00::/8
Multicast Address Scopes
0-8 bits of Multicast Address
Indicator
9-16 of Multicast Address
Flags | Scope ID
17-128 of Multicast Address
Multicast Group ID
List Scope ID values
0 1 2 5 8 14 15
What are the Multicast Address Scopes and what Scope ID values do they belong to?
Reserved - 0 Node Local Scope - 1 Link Local Scope - 2 Site Local Scope - 5 Organization Local Scope - 8 Global Scope - 14 Reserved - 15
IPv6 packets are encapsulated within IPv4 packets.
6to4, 6in4, Teredo, ISATAP
Handled by routers
Tunneling
Dual stack devices can be configured to preform translation between IPv6 & IPv4, changing the packet headers.
IPv6 request —-> IPv4 —–IPv4 Infrastructure—->IPv6 if necessary
Translation
Process of loading both IPv4 & IPv6 on network nodes . Allows a machine to utilize either.
Dual Stacking
