Question 1

What is the first step in configuring IPv6 routing on a Cisco IOS router?&#10;A) Enable the IPv6 routing protocol.&#10;B) Enable IPv6 routing.&#10;C) Enable IPv6 routing on the interface.&#10;D) Use the autoconfig ipv6 global configuration command.

Accepted Answer

B) IPv6 routing should be enabled first using the ipv6 unicast-routing command.

Question 2

Which Cisco IOS command is used to display the IPv6 multicast groups to which an interface belongs?&#10;A) show interfaces&#10;B) show ipv6 group&#10;C) show ipv6 interface&#10;D) show ipv6

Accepted Answer

C) The show ipv6 interface command displays information similar to the IPv4 show ip interface command, as well as other IPv6-specific settings. One thing it displays is the multicast groups to which the interface has been joined.

Question 3

When generating a unique interface ID, the rules of EUI-64 are often used (eui-64). If the MAC address of an interface is 0000.1111.2222, what is the EUI-64 converted interface ID going to be?&#10;A) 0000:11FF:FE11:2222&#10;B) 0000:11FE:FE11:2222&#10;C) 0200:11FE:FE11:2222&#10;D) 0200:11FF:FE11:2222

Accepted Answer

D) There are several steps to converting a MAC address to an EUI-64 interface ID:
1. Split the MAC address into two equal 6-byte parts.
2. Place the hex digits FFFE between the two parts.
3. From the left, take the seventh bit and invert it (if it was 0, it inverts to 1, and vice versa).
For this question, the MAC address is 0000.1111.2222:
1. 0000.11 11.2222
2. 0000.11FF FE11.2222
3. The seventh bit is 0. When converted to 1, the second hex digit becomes 2; 0020:11FF:FE11:2222.

Question 4

When generating a unique interface ID, the rules of EUI-64 are often used (eui-64). If the MAC address of an interface is 08ce.1543.1845, what is the EUI-64 converted interface ID going to be?&#10;A) 0ACE:15FF:FE43:1845&#10;B) 08CE:15FF:FE43:1845&#10;C) 08CE:15FE:FE43:1845&#10;D) 0ACE:15FE:FE43:1845

Accepted Answer

A) There are several steps to converting a MAC address to an EUI-64 interface ID:
1. Split the MAC address into two equal 6-byte parts.
2. Place the hex digits FFFE between the two parts.
3. From the left, take the seventh bit and invert it (if it was 0, it inverts to 1, and vice versa).
For this question, the MAC address is 08ce.1543.1845:
1. 08ce.15 43.1845
2. 08ce.15FF FE43.1845
3. The seventh bit is 0. When converted to 1, the second hex digit becomes A (the byte was 8 in hex, 1000 in binary; flip the third bit [seventh from the end]: 1010 is A in hex); 0ACE:15FF:FE43:1845.

Question 5

Packets sent to a ________ address do not leave the IPv6 subnet.&#10;A) Unique local&#10;B) Link-local&#10;C) Global unicast&#10;D) Multicast

Accepted Answer

B) Link local IPv6 addresses do what they say: They are limited to be forwarded only on a single local link. No IPv6 router will forward these frames outside that specific configured link.

Question 6

When a link-local address is created on an IPv6 device, it always has the prefix ________.&#10;A) FE::/8&#10;B) FFFE::/10&#10;C) FE80::/10&#10;D) FEFE::/10

Accepted Answer

C) All link-local addresses must start with the same prefix; by definition, this is FE80::/10. Note that this only masks the first 10 bits of the prefix, which means it includes FE8::, FE9, FEA, and FEB prefixes.

Question 7

Which IPv6 multicast address has been defined to include all hosts that run IPv6 on a local link?&#10;A) FF01::1&#10;B) FF01::2&#10;C) FF02::2&#10;D) FF02::1

Accepted Answer

D) For a device to send a multicast packet and be received by all local (local-link) IPv6 supporting hosts, the FF02::1 address has been defined. The FF02::2 address has been defined for use for all local IPv6 routers.

Question 8

Which IPv6 multicast addresses are used by OSPFv3 for communications between OSPFv3-configured devices?&#10;A) FF02::5&#10;B) FF02::6&#10;C) FF02::A&#10;D) FF02::9

Accepted Answer

A) Just like OSPF for IPv4, which uses 224.0.0.5 and 224.0.0.6, OSPFv3 uses similar IPv6 equivalents FF02::5 (all OSPFv3 devices) and FF02::6 (OSPFv3 DR and BDR).
B) Just like OSPF for IPv4, which uses 224.0.0.5 and 224.0.0.6, OSPFv3 uses similar IPv6 equivalents FF02::5 (all OSPFv3 devices) and FF02::6 (OSPFv3 DR and BDR).

Question 9

What special address is used for the IPv6 loopback?&#10;A) ::7F00:0001&#10;B) 1::&#10;C) ::1&#10;D) 7F00:0001::

Accepted Answer

C) With IPv6, the loopback is 127 zeros and a single 1, ::1.

Question 10

The show command lists IPv6 addresses with which of the following characteristics?&#10;A) The address is abbreviated.&#10;B) The address is the complete IPv6 address (leading zeros are included).&#10;C) The address is in uppercase hex digits.&#10;D) The address is in binary digits.

Accepted Answer

A) The Cisco router uses abbreviations and uppercase hex digits to display IPv6 addresses.
C) The Cisco router uses abbreviations and uppercase hex digits to display IPv6 addresses.

Question 11

When using EUI-64 for addressing, the MAC address is split in half and ________ is inserted between the two halves with the seventh bit of the interface ID inverted.&#10;A) FFFE&#10;B) FD&#10;C) FE&#10;D) FE80

Accepted Answer

The answer of When using EUI-64 for addressing, the MAC...

Question 12

When using EUI-64, what is the correct result of inverting the seventh bit of the interface ID with an interface ID of 0148:45FF:798A?&#10;A) 0148:45DF:798A&#10;B) 0348:45FF:798A&#10;C) 0f48:45FF:798A&#10;D) 0048:45FF:798A

Accepted Answer

The answer of When using EUI-64, what is the correct...

Question 13

When using EUI-64, what is the correct result of inverting the seventh bit of the interface ID with an interface ID of B2C3:7AA0:8801?&#10;A) B2C3:7A80:8801&#10;B) B0C3:7AA0:8801&#10;C) B3C3:7AA0:8801&#10;D) BDC3:7AA0:8801

Accepted Answer

The answer of When using EUI-64, what is the correct...

Question 14

Which of the following represents the address a host can use to test its own IP stack in IPv6?&#10;A) ::&#10;B) ::1&#10;C) 1::&#10;D) FD::

Accepted Answer

The answer of Which of the following represents the address...

Question 15

Which of the following can a host use as its address when its own IPv6 address is not yet known?&#10;A) ::&#10;B) ::1&#10;C) 1::&#10;D) FD::

Accepted Answer

The answer of Which of the following can a host...

Deck 24: Implementing IPV6 Addressing on Routers