CCNA - IPv6
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Why do we need IPv6?
without IPv6, the world would be depleted of IP addresses
____-_____ is like an IPv4 private IP address, but it can't be routed all, not even in your organization.
How many bits is IPv6 than IPv4 and how is it represented?
128 bits long and represented in hexadecimal (IPv4 is only 32 bits long and represented in decimal)
_____-_____ this, like link-local is like the private IP addresses in IPv4 and cannot be routed to the internet. However, the difference between link-local and <answer-here> is that this can be routed within your organization or company.
What are some improved features that are standard and mandatory in IPv6?
- IPSec - provides end-to-end security
- Mobility - allowing devices to roam from one network to another without dropping connections
How many bits are in the header of an IPv6 packet?
These are your typical publicly routable addresses, and they're the same as they are in IPv4.
Global unicast addresses
Why is there no broadcast used in IPv6?
because it uses multicast traffic instead
This type of communication allows the same address to be placed on more than one device so that when the traffic is sent to one device addressed in this way, it is routed to the nearest host that shares the same address.
Describe the 3 fields that make up IPv6 and how are they expressed.
- Global prefix
- Interface ID
- And IPv6 is expressed in eight 16-bit hexadecimal colon-delimited blocks
What is the rule that we must follow when replacing blocks of zeros with double colons?
you can only replace one contiguous block of zeros in an address using the double colons
What are the 6 different types of addressing and communication methods?
- global unicast addresses
- link-local address
- unique local address
How can you tell if a IPv6 address is a Multicast address?
They always start with "FF".
These are your typical publicly routable addresses, and they're the same as they are in IPv4
global unicast address
This is used with 6to4, which is the transition system - the structure that allows IPv6 packets to be transmitted over an IPv4 network without the need to configure explicit tunnels.
These two are reserved for examples and documentation.
This IPv6 Special Address is equivalent of IPv4's 0.0.0.0, and is typically the source address of a host when you're using stateful configuration.
This is used for the multicast range.
This is used for the link-local unicast range.
This IPv6 Special Address is the equivalent of 127.0.0.1 in IPv4.
- 0:0:0:0:0:0:0:1 - ** NOTE, Equals to ::1
This is used for the unique local unicast range
This is used for the global unicast address range
Represent IPv4 address 192.168.100.1 in a IPv6 format in a mixed IPv6/IPv4 network environment.
Since the interface ID in an IPv6 address is 64 bits in length and a MAC address is only 48 bits, where do the extra 16 bits come from?
The MAC address is padded in the middle with extra bits - it's padded with FFFE.
What is the 1st step in the basic two-step process a host goes through to perform autoconfiguration?
host needs the prefix information to configure its interface, so it sends a router solicitation (RS) request. RS then sends out a multicast in ICMP type 133
What is the 2nd step in the basic two-step process a host goes through to perform autoconfiguration?
the router answers back with the required prefix information via a router advertisement (RA). An RA messages is a multicast packet and is ICMP type 134.
What is the two-step IPv6 autoconfiguration also known as?
What is the IPv6 version of ARP?
Neighbor Discovery in ICMPv6
The modifidied eui-64 format changes a bit to specify if the address is locally unique or globally unique. Define both the local and global unique bit.
bit value of 1 means global unique and bit value of 0 means local unique
What UDP port does RIPv2 use in IPv6?
UDP port 521
What is the multicast address that RIPv2 uses in IPv6?
What is the multicast address that EIGRPv6 uses?
FF02::A (A = 10 in hexadecimal)
What is the multicast address that is used in OSPFv3?
- FF02::5 for OSPF routers
- FF02::6 for OSPF-designated routers
What is the most common type of IPv4 to IPv6 migration strategy?
- dual stacking - Allows your devices to communicate using either IPv4 or IPv6. Also let's you upgrade your devices and applications on the network one at a time.
____ ________ is really useful for carrying IPv6 data over a network that's still IPv4.
Which tunneling (transition technology) protocol allows all your tunnel traffic to be placed in UDP packets and why?
Teredo Tunneling -This tunnelling protocol is used to prevent NAT from breaking tunnelling connections by disguising packets as UDP packets.
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