Section 13: Introducing Basic IPv6

Which three statements about assigning IPv6 addresses to hosts are accurate?

- The host identifier portion of the address can be computed automatically using the EUI-64 interface ID. - A node on a link can automatically configure its entire global IPv6 address by appending its interface identifier to a prefix that it learns from a router advertisement message. - Stateful DHCPv6 keeps a record of which addresses are assigned to which hosts

How does the MAC address 00a1-6789-abcd translate into the right-most 64 bits of the IPv6 address when EUI-64 is used?

02a1:67ff:fe89:abcd

How many bits are there in IPv6 addresses?

128

Which three options are valid representations of the IPv6 address 2001:db8:2bc5:0000:0000:087c:0000:000a?

2001:db8:2bc5::87c:0:a 2001:db8:2bc5::087c:0000:000a 2001:db8:2bc5:0:0:87c::a

How many bits are there in IPv4 addresses?

32

What is the corresponding MAC address for the solicited node multicast address ff02:0000:0000:0000:0000:0001:ff17:fc0f?

33-33-ff-17-fc-0f

Which protocol in IPv4 performs the same functions as neighbor discovery in IPv6?

ARP

Which three mechanisms are used to extend the lifetime and usefulness of IPv4?

CIDR VLSM NAT

What mechanisms were created to extend the lifetime and usefulness of IPv4 and to circumvent the address shortage?

Classless interdomain routing (CIDR) Variable-length subnet masking (VLSM) Network address translation (NAT) Private IPv4 address space

This is used extensively in IPv4 networks to dynamically allocate addresses, typically from private IPv4 address space, which is then translated to public addresses using NAT.

DHCP

This defines the method to create an interface identifier from an IEEE 48-bit MAC address by inserting the hexadecimal number fffe between the upper 3 bytes (OUI field) and the lower 3 vendor assigned bytes of the MAC address.

Extended Universal Identifier 64-bit format (EUI-64)

Which new IPv6 header field has a length of 20 bits and is used to mark individual traffic flows with unique values?

Flow Label

Which two statements describe the characteristics of IPv6 unicast addressing?

Global addresses start with 2000::/3. There is only one loopback address, and it is::1.

Which IPv6 header field specifies the maximum number of hops that an IPv6 packet can take?

Hop Limit

Which two ICMPv6 types are used for pinging?

ICMPv6 Type 128 ICMPv6 Type 129

Which two ICMPv6 types are used for router discovery?

ICMPv6 Type 133 ICMPv6 Type 134

Which two ICMPv6 types are used for neighbor discovery?

ICMPv6 Type 135 ICMPv6 Type 136

Which two ICMPv6 types are used for testing IPv6 reachability?

ICMPv6 type 128 ICMPv6 type 129

Which feature does IPv6 support for securely connecting to networks?

IPsec

Which statement is correct about the EUI-64 address format of the interface ID for stateless autoconfiguration that is used by Cisco?

It expands the 48-bit MAC address to 64 bits by inserting FFFE into the middle 16 bits and then inverting the 7th bit in the first octet.

Which of these features make IPv6 attractive for building global-scale, highly effective networks?

Larger address space Simpler header Security and mobility Transition richness

In which mechanism can a device be configured with a private IPv4 address but communicate on the internet using a globally routable IPv4 address?

NAT

What are four problems with IPv4 addressing workarounds?

NAT breaks the end-to-end model of IP. NAT inhibits end-to-end network security. Some applications are not NAT-friendly. The merging of private networks is difficult if overlapping IPv4 address ranges are used.

Which two parts would make a complete IPv6 address?

Network ID Interface ID

Which IPv6 header field determines the type of information that follows the basic IPv6 header?

Next Header

Which IPv6 header field is populated with 58 to identify the ICMPv6 packet?

Next Header

Which field determines the type of information that follows the basic IPv6 header?

Next Header

Within IPv6, how does a host receive the default gateway information?

Only through router advertisements.

Which IPv6 header field describes the length of the payload only?

Payload Length

This is one way to assign an address to a device where you would enable DHCP servers to pass configuration parameters, such as IPv6 network addresses, to IPv6 nodes.

Stateful DHCPv6

This is one way to assign an address to a device where you would rely on autoconfiguration as a mechanism that automatically configures the IPv6 address of a node.

Stateless Address Autoconfiguration (SLAAC)

This is one way to assign an address to a device where the device gets its IPv6 address and default gateway using SLAAC, but gets all the other information, such as domain names, DNS servers, etc. from the DHCPv6 server.

Stateless DHCPv6

This is one way to assign an address to a device where you would statically assign an IPv6 address is to configure the prefix (network) portion of the IPv6 address and derive the interface ID (host) portion from the MAC address of the device.

Static assignment using an EUI-64 interface ID

This is one way to assign an address to a device where you would manually assign both the prefix (network) and interface ID (host) portions of the IPv6 address.

Static assignment using prefix and manual interface ID

Which IPv6 header 8-bit field is used by the source node to mark the priority of outbound packets?

Traffic Class

Which IPv6 header field is a 4-bit field that contains the number 6, instead of the number 4 as in IPv4?

Version

In which type of IPv6 address does the sender send the traffic to the nearest of multiple nodes, all of which behave in the same way as other nodes that are identified by the same destination address?

anycast

Which address type is not supported in IPv6?

broadcast

Which of these is not an IPv6 address?

broadcast

What is the option for transitioning between IPv4 and IPv6 networks where both IPv4 and IPv6 are fully deployed across the infrastructure?

dual-stack network

What is the range for IPv6 link-local addresses?

fe80::/10

What is the range for IPv6 multicast addresses?

ff00::/8

What is the solicited-node multicast IPv6 address for 2001:db8:1001:f:2c0:10ff:fe17:fc0f?

ff02:0000:0000:0000:0000:0001:ff17:fc0f

This IPv6 unicast address is the equivalent to IPv4 public addresses that have global reach.

global unicast

Which Cisco IOS interface command assigns a static IPv6 address using an EUI-64 interface ID?

ipv6 address 2001:0db8:0:1::/64 eui-64

What is the command on the interface that enables stateless autoconfiguration for that interface?

ipv6 address autoconfig

Which Cisco IOS global configuration command is needed to enable IPv6 routing on routers?

ipv6 unicast-routing

What are the four benefits of IPv6 over IPv4?

larger address space simpler header mobility transition richness

Which address bits uniquely identify a group ID in the IPv6 multicast address?

last 112 bits

This IPv6 unicast address refer only to a particular physical link.

link-local

This unicast address would start with fe80::/10

link-local

This IPv6 address is used for testing purposes and is the equivalent to IPv4 127.0.0.1

loopback

In which type of IPv6 address does the sender send the traffic to an address that defines a group from a unicast source address?

multicast

You want to ping the loopback address of your IPv6 local host. Which command will you enter?

ping ::1

Routers periodically send this on all their configured interfaces through the all-nodes multicast address ff02::1

router advertisement

Hosts will send this to ask routers that are connected to the local link to send a response so that the host can receive the autoconfiguration information without waiting.

router solicitation

Which command verifies end-to-end transport layer connectivity for HTTP from a PC over an IPv6 path?

telnet IPv6_address 80

What is the option for transitioning between IPv4 and IPv6 networks where address translation between the two address families is performed?

translation

What is the option for transitioning between IPv4 and IPv6 networks where organizations build an overlay network that tunnels one protocol over the other by encapsulating IPv6 packets within IPv4 packets over the IPv4 network and IPv4 packets within IPv6 packets IPv6 network?

tunneling

This IPv6 unicast address are analogous to private IPv4 addresses in that they are used for local communications, intersite VPNs, and so on, except for one important difference - these addresses are not intended to be translated to a global unicast address.

unique local

This unicast address would start with fc00::/7

unique-local

This IPv6 address contains all 0's.

unspecified