| Question 1 | Which command displays the status of IPv6 interfaces only? -
A. ifconfig -a -
B. ifconfig -a IPv6 -
C. ifconfig -a inet6 -
D. ifconfig -a ip6 |
| A1: | Answer C is correct because the command ifconfig -a inet6 displays the status of IPv6 interfaces, ignoring IPv4 interfaces. Answer A is incorrect because ifconfig -a displays the status of all interfaces, both IPv4 and IPv6. Answer B and D are incorrect because the arguments IPv6 and ip6 are invalid and not part of the syntax. |
| Question 2 | Which of the following are features of IPv6? Choose 3. -
A. Longer header formats provide a greater amount of information to be contained within the header. -
B. IPv6 provides expanded addressing, increasing the address size from 32-bit addresses to 128-bit addresses. -
C. Quality of service allows a sequence of packets to be labeled for priority handling. -
D. Extension headers have been removed to allow the primary header to be processed more efficiently . -
E. IPv6 addresses can be automatically assigned with the new autoconfiguration feature. |
| A2: | Answers B, C, and E are correct because IPv6 addresses have expanded from 32 bits in IPv4 to 128 bits in IPv6. Also, IPv6 provides a quality of service feature that allows a sequence of datagrams that require priority handling to be identified. The addition of autoconfiguration enables IPv6 addresses to be assigned automatically. Answer A is incorrect because the IPv6 header has been simplified; the number of fields has been reduced. Answer D is incorrect because extension headers have been added to IPv6 to improve routing performance. Additional information can be contained within the datagram that is intended for the recipient, so each router the datagram passes through doesn't have to examine the contents, and subsequently consume more resources. |
| Question 3 | Which IPv6 address type involves an address being assigned to a number of interfaces, with IPv6 datagrams being delivered to the nearest interface member, rather than to all interfaces that have the address assigned? -
A. Anycast -
B. Broadcast -
C. Multicast -
D. Unicast |
| A3: | Answer A is correct because the anycast address type involves an address being assigned to a number of interfaces, but the datagrams are delivered to only the nearest member with the address assigned. Answer B is incorrect because broadcast addresses are not used in IPv6. Answer C is incorrect because a multicast address involves an address being assigned to a number of interfaces, but the datagrams are delivered to all members with the address assigned. Answer D is incorrect because a unicast address involves a single address being assigned to a single interface and is used when a host communicates with another host on the network. |
| Question 4 | Which of the following IPv6 addresses is invalid? -
A. fe80:0000:0000:0000:0a00:20ff:feb3:4153 -
B. fe80:0:0:0:a00:20ff:feb3:4153 -
C. fe80::0000::0a00:20ff:feb3:4153 -
D. fe80::a00:20ff:feb3:4153 |
| A4: | Answer C is correct because the IPv6 address fe80::0000::0a00:20ff:feb3:4153 makes use of the double colon (::) character twice. This can be used only once in an IPv6 address. Answers A, B, and D are incorrect because these are all valid IPv6 addresses. |
| Question 5 | Which type of unicast address would you use if the address needs to be routed through the Internet? |
| A5: | Answer A is correct because an aggregatable global unicast address is the type that can be routed through the Internet. Answer B is incorrect because a link-local address is used to provide communication between single hosts on a local link and cannot be routed. Answer C is incorrect because a loopback address is used by an IPv6 system to send datagrams to itself. Answer D is incorrect because a site-local address can be routed only through an intranet and is limited to the same site. It cannot be routed externally through the Internet. |
| Question 6 | In an IPv6 datagram header, what does the Payload length field describe? -
A. The length of the data portion of the datagram -
B. The length of the data and IPv6 header -
C. The length of the data, IPv6 header, and extension headers, if present -
D. The length of the data and any extension headers, but not the IPv6 header itself |
| A6: | Answer D is correct because the Payload length field of an IPv6 header identifies the length of the data and any extension headers that follow the IPv6 datagram header, but not the IPv6 header itself. Answers A, B, and C are incorrect because the Payload length field contains the length of the data and extension headers only, not the IPv6 header. |
