14.3 Internet Protocol Version 6 (IPv6) Review

C. To enable IPv6 routing on the Cisco router, use the following command from global config: ipv6 unicast-routing If this command is not recognized, your version of IOS does not support IPv6.

20. Which command enables IPv6 forwarding on a Cisco router? A. ipv6 local B. ipv6 host C. ipv6 unicast-routing D. ipv6 neighbor

C. A router solicitation is sent out using the all-routers multicast address of FF02::2. The router can send a router advertisement to all hosts using the FF02::1 multicast address.

A host sends a router solicitation (RS) on the data link. What destination address is sent with this request? A. FF02::A B. FF02::9 C. FF02::2 D. FF02::1 E. FF02::5

A. The NDP neighbor advertisement (NA) contains the MAC address. A neighbor solicitation (NS) was initially sent asking for the MAC address.

A host sends a type of NDP message providing the MAC address that was requested. Which type of NDP was sent? A. NA B. RS C. RA D. NS

D. The modified EUI-64 format interface identifier is derived from the 48-bit link-layer (MAC) address by inserting the hexadecimal number FFFE between the upper 3 bytes (OUI field) and the lower 3 bytes (serial number) of the link layer address.

How is an EUI-64 format interface ID created from a 48-bit MAC address? A. By appending 0xFF to the MAC address B. By prefixing the MAC address with 0xFFEE C. By prefixing the MAC address with 0xFF and appending 0xFF to it D. By inserting 0xFFFE between the upper 3 bytes and the lower 3 bytes of the MAC address E. By prefixing the MAC address with 0xF and inserting 0xF after each of its first three bytes

D. This question asked how many bits in a field, not how many bits in an IPv6 address. There are 16 bits (four hex characters) in an IPv6 field and there are eight fields.

How many bits are in an IPv6 address field? A. 24 B. 4 C. 3 D. 16 E. 32 F. 128

A, C, D. Several methods are used in terms of migration, including tunneling, translators, and dual-stack. Tunnels are used to carry one protocol inside another, while translators simply translate IPv6 packets into IPv4 packets. Dual-stack uses a combination of both native IPv4 and IPv6. With dual-stack, devices are able to run IPv4 and IPv6 together, and if IPv6 communication is possible, that is the preferred protocol. Hosts can simultaneously reach IPv4 and IPv6 content.

What are three approaches that are used when migrating from an IPv4 addressing scheme to an IPv6 scheme? (Choose three.) A. Enable dual-stack routing. B. Configure IPv6 directly. C. Configure IPv4 tunnels between IPv6 islands. D. Use proxying and translation to translate IPv6 packets into IPv4 packets. E. Statically map IPv4 addresses to IPv6 addresses. F. Use DHCPv6 to map IPv4 addresses to IPv6 addresses.

B, C, E. An important feature of IPv6 is that it allows the plug-and-play option to the network devices by allowing them to configure themselves independently. It is possible to plug a node into an IPv6 network without requiring any human intervention. IPv6 does not implement traditional IP broadcasts.

What are three features of the IPv6 protocol? (Choose three.) A. Optional IPsec B. Autoconfiguration C. No broadcasts D. Complicated header E. Plug-and-play F. Checksums

A, E. IPv6 does not use broadcasts, and autoconfiguration is a feature of IPV6 that allows for hosts to automatically obtain an IPv6 address.

What are two valid reasons for adopting IPv6 over IPv4? (Choose two.) A. No broadcast B. Change of source address in the IPv6 header C. Change of destination address in the IPv6 header D. No password required for Telnet access E. Autoconfiguration F. NAT

B. IPv6 anycast addresses are used for one-to-nearest communication, meaning an anycast address is used by a device to send data to one specific recipient (interface) that is the closest out of a group of recipients (interfaces).

Which is known as "one-to-nearest" addressing in IPv6? A. Global unicast B. Anycast C. Multicast D. Unspecified address

A, D. Global addresses start with 2000::/3, link-locals start with FE80::/10, loopback is ::1, and unspecified is just two colons (::). Each interface will have a loopback address automatically configured.

Which of the following correctly describe characteristics of IPv6 unicast addressing? (Choose two.) A. Global addresses start with 2000::/3. B. Link-local addresses start with FF00::/10. C. Link-local addresses start with FE00:/12. D. There is only one loopback address and it is ::1.

B. There are no broadcasts with IPv6. Unicast, multicast, anycast, global, and link-local unicast are used.

Which of the following descriptions about IPv6 is correct? A. Addresses are not hierarchical and are assigned at random. B. Broadcasts have been eliminated and replaced with multicasts. C. There are 2.7 billion addresses. D. An interface can only be configured with one IPv6 address.

B, E, F. Anycast addresses identify multiple interfaces, which is somewhat similar to multicast addresses; however, the big difference is that the anycast packet is only delivered to one address, the first one it finds defined in terms of routing distance. This address can also be called one-to-one-of-many, or one-to-nearest.

Which of the following is true when describing an IPv6 anycast address? A. One-to-many communication model B. One-to-nearest communication model C. Any-to-many communication model D. A unique IPv6 address for each device in the group E. The same address for multiple devices in the group F. Delivery of packets to the group interface that is closest to the sending device

B, D. To shorten the written length of an IPv6 address, successive fields of zeros may be replaced by double colons. In trying to shorten the address further, leading zeros may also be removed. Just as with IPv4, a single device's interface can have more than one address; with IPv6 there are more types of addresses and the same rule applies. There can be link-local, global unicast, multicast, and anycast addresses all assigned to the same interface.

Which of the following statements about IPv6 addresses are true? (Choose two.) A. Leading zeros are required. B. Two colons (::) are used to represent successive hexadecimal fields of zeros. C. Two colons (::) are used to separate fields. D. A single interface will have multiple IPv6 addresses of different types.

B, C. If you verify your IP configuration on your host, you'll see that you have multiple IPv6 addresses, including a loopback address. The last 64 bits represent the dynamically created interface ID, and leading zeros are not mandatory in a 16-bit IPv6 field.

Which of the following statements are true of IPv6 address representation? (Choose two.) A. The first 64 bits represent the dynamically created interface ID. B. A single interface may be assigned multiple IPv6 addresses of any type. C. Every IPv6 interface contains at least one loopback address. D. Leading zeroes in an IPv6 16-bit hexadecimal field are mandatory.

D. An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). Option A has two double colons, B doesn't have 8 fields, and option C has invalid hex characters.

Which option is a valid IPv6 address? A. 2001:0000:130F::099a::12a B. 2002:7654:A1AD:61:81AF:CCC1 C. FEC0:ABCD:WXYZ:0067::2A4 D. 2004:1:25A4:886F::1

A, B, C. This question is easier to answer if you just take out the wrong options. First,the loopback is only ::1, so that makes option D wrong. Link local is FE80::/10, not /8 and there are no broadcasts..

Which three statements about IPv6 prefixes are true? (Choose three.) A. FF00:/8 is used for IPv6 multicast. B. FE80::/10 is used for link-local unicast. C. FC00::/7 is used in private networks. D. 2001::1/127 is used for loopback addresses. E. FE80::/8 is used for link-local unicast. F. FEC0::/10 is used for IPv6 broadcast.

A, B, C. The Internet Header Length field was removed because it is no longer required. Unlike the variable-length IPv4 header, the IPv6 header is fixed at 40 bytes. Fragmentation is processed differently in IPv6 and does not need the Flags field in the basic IPv4 header. In IPv6, routers no longer process fragmentation; the host is responsible for fragmentation. The Header Checksum field at the IP layer was removed because most Data Link layer technologies already perform checksum and error control, which forces formerly optional upper-layer checksums (UDP, for example) to become mandatory.

Which three ways are an IPv6 header simpler than an IPv4 header? (Choose three.) A. Unlike IPv4 headers, IPv6 headers have a fixed length. B. IPv6 uses an extension header instead of the IPv4 Fragmentation field. C. IPv6 headers eliminate the IPv4 Checksum field. D. IPv6 headers use the Fragment Offset field in place of the IPv4 Fragmentation field. E. IPv6 headers use a smaller Option field size than IPv4 headers. F. IPv6 headers use a 4-bit TTL field, and IPv4 headers use an 8-bit TTL field.

A, B. ICMPv6 router advertisements use type 134 and must be at least 64 bits in length.

Which two statements about IPv6 router advertisement messages are true? (Choose two.) A. They use ICMPv6 type 134. B. The advertised prefix length must be 64 bits. C. The advertised prefix length must be 48 bits. D. They are sourced from the configured IPv6 interface address. E. Their destination is always the link-local address of the neighboring node.

A, D. The loopback address is ::1, link-local starts with FE80::/10, site-local addresses start with FEC0::/10, global addresses start with 200::/3, and multicast addresses start with FF00::/8.

Which two statements describe characteristics of IPv6 unicast addressing? (Choose two.) A. Global addresses start with 2000::/3. B. Link-local addresses start with FE00:/12. C. Link-local addresses start with FF00::/10. D. There is only one loopback address and it is ::1. E. If a global address is assigned to an interface, then that is the only allowable address for the interface.

C. The loopback address with IPv4 is 127.0.0.1 With IPv6, that address is ::1

You want to ping the loopback address of your IPv6 local host. What will you type? A. ping 127.0.0.1 B. ping 0.0.0.0 C. ping ::1 D. trace 0.0.::1