Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Network + Exam N10-008 > Chapter 12: IPv6 > Flashcards

Chapter 12: IPv6 Flashcards

1
Q

Define: IPv6 Address

A

A 128-bit address consisting of eight sets of four hexadecimal numbers, each number being a value between 0000 and ffff, using a colon to separate the numbers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What two IPv6 addresses may not be used?

A

An all 0s and an all ffffs address.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What two parts are IPv6 addresses generally split into?

A

A 64-bit network prefix used for routing and a 64-bit interface ID, the user portion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The network prefix of an IPv6 address gets split into what two parts?

A

A routing prefix and a subnet ID.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the IPv6 shorthand notation rules?

A

Leading zeroes can be dropped and only one group of contiguous zeroes can be represented by a double colon (::).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What does the IPv6 “/x” prefix length naming convention specify?

A

The number of bits in the network ID.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the IPv6 loopback address?

A

::1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Does a host have one or more IPv6 addresses?

A

It has more than one.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is a link-local address and what is it used for?

A

The address that a computer running IPv6 gives itself after first booting. It is used for communicating on a local network.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the IPv6 link-local address?

A

The first 64 bits are always fe80::/64 (fe80:0000:0000:0000)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the two ways the 64-bit interface ID is generated in IPv6?

A

Most OSs generate a 64-bit random number. Older OSs and some devices may use the device’s MAC address to create a 64-bit number called an Extended Unique Identifier, 64-bit (EUI-64).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a unicast address in IPv6?

A

A unique address exclusive to that system in a LAN and is the link-local address.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What address type does a client need to access IPv6 content on the Internet?

A

A global unicast address

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Does IPv6 use broadcast addresses or multicast addresses?

A

Multicast addresses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the all-nodes IPv6 multicast address?

A

ff02::1

The 2 (scope) indicates the local network segment.
The 1 (group) indicates all nodes within the scope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the all-routers IPv6 multicast address?

A

ff02::2

The first 2 (scope) indicates the local network segment.
The second 2 (group) indicates all routers within the scope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the solicited-node IPv6 multicast address?

A

ff02::1:ffxx:xxxx (The last six digits equal the last six digits of the corresponding unicast address).

18
Q

What is the Ethernet address (MAC address) for IPv6 multicast traffic?

A

33-33-xx-xx-xx-xx

19
Q

Define: IPv6 Anycast Address

A

A single IP address shared by multiple hosts.

Routers are configured to direct traffic destined for that single address to the closest system based on what routing metrics were chosen.

20
Q

The ____ is an IPv6 protocol that performs the same functions as ARP in IPv4 and plays a role in features such as stateless address autoconfiguration (SLAAC).

A

NDP or Neighbor Discovery Protocol

21
Q

What are NDP’s (Neighbor Discovery Protocol’s) five control message types?

A

Neighbor solicitation
Neighbor advertisement
Router solicitation
Router advertisement
Redirect

22
Q

Hosts use ____ messages to request the MAC address of a target system, to inform the target system of their own MAC address, and to verify a system is still reachable. They also help IPv6 hosts detect duplicate addresses on the local network.

A

neighbor solicitation

23
Q

What IPv6 multicast address does a host send a neighbor solicitation message to for finding out a MAC address?

A

The solicited-node multicast address

24
Q

What is the neighbor discovery cache in IPv6?

A

A host’s list of known MAC addresses.

25
Q

What are neighbor advertisement messages used for in IPv6?

A

To respond to neighbor solicitation messages with the host’s MAC address and to let the requesting system know that it is reachable.

These packets are sent via unicast addresses.

26
Q

What are router solicitation messages used for in IPv6?

A

Nodes on the network send them to find any routers on the network.

These packets are always sent to the all-router multicast address.

27
Q

Routers use ____ messages in an IPv6 network to send out important information such as their MAC and link-local addresses (default gateway), how hosts on the network should get a global unicast address, whether to use DHCP, and DNS server addresses.

A

router advertisement

28
Q

What are redirect messages used for in IPv6?

A

They enable a router to tell a host that there is a better router to use for traffic to a given destination when multiple routers are available for a host to use.

29
Q

What is stateless address autoconfiguration (SLAAC)?

A

A process that enables network clients to determine their own IPv6 addresses without the need for DHCP. SLAAC leans heavily on the neighbor discovery process supported by NDP.

30
Q

What does a DHCPv6 server in stateful mode do?

A

It tells the host the full 128-bit address it should use and keeps track of the addresses it has passed out. It also gives out other information.

31
Q

What does a DHCPv6 server in stateless mode do?

A

It lets hosts pick out their own IPv6 addresses using SLAAC (stateless address autoconfiguration) and gives out other information.

32
Q

What is the main benefit of IPv6 aggregation?

A

Aggregation reduces the size and complexity of routing tables, allowing routers to work more efficiently.

33
Q

As you get to the top of the Internet, the Tier 1 routers that connect to other Tier 1 routers can’t have any default route. These no-default routers make up the ____.

A

default-free zone (DFZ)

34
Q

What is aggregation in IPv6?

A

Where every router underneath one router always uses a subset of that router’s existing routes.

35
Q

What does the 4to6 IPv4-to-IPv6 tunneling standard do?

A

It encapsulates IPv4 traffic into an IPv6 tunnel to get it across the IPv6 gap to an IPv6-enabled router.

36
Q

What is the 6in4 IPv6 tunneling protocol?

A

It is one of only two IPv6 tunneling protocols that can go through IPv4 NAT (called NAT traversal).

37
Q

What service do tunnel brokers provide?

A

They create a tunnel and offer a custom-made endpoint client for users on IPv4 infrastructure to jump the gap between their computers and the IPv6 Internet routers.

38
Q

What do Tunnel Setup Protocol (TSP) and Tunnel Information and Control (TIC) protocol do?

A

They set up IPv6 tunnels and handle configuration as well as login.

39
Q

An ____ enables two IPv6 networks to connect over an IPv4 network by encapsulating the IPv6 packets within IPv4 headers, transporting them across the IPv4 network, then decapsulating the IPv6 data.

A

overlay tunnel

40
Q

What is NAT64?

A

A transition mechanism that attaches the bytes of an IPv4 address onto the end of an IPv6 address for network traversal.

41
Q

Is NAT needed with IPv6?

A

No, the address space is so large that rationing routable addresses is unnecessary.

42
Q

Downstream routers may, in theory, do what if their upstream router suddenly changes the IPv6 prefix it delegates to them?

A

Send an all-nodes router advertisement so that clients can renumber.

Network + Exam N10-008 (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions