Exam Prep Questions

Question 1	Which of the following commands creates a test address for the network interface hme0 so that it can be used in IPv6 multipathing? A. ifconfig hme0 -failover B. ifconfig hme0 inet6 -failover C. ifconfig hme0 inet6 deprecated -failover D. ifconfig inet6 hme0 -failover
A1:	Answer B is correct because the command ifconfig hme0 inet6 -failover creates a test address for the network interface hme0 so that it can be used as part of the IPv6 multipathing mechanism. Answer A is incorrect because this would modify the IPv4 network interface and not the IPv6 interface. Answer C is incorrect because IPv6 multipathing does not require the interface to be marked as deprecated . Answer D is incorrect because the syntax is wrong ”the interface name must be entered immediately following the ifconfig command, as the first argument.
Question 2	Which command verifies the status of only the IPv6 network interfaces? A. ifconfig -a inet6 B. ifconfig inet6 C. ifconfig inet6 -a D. ifconfig -a ip6
A2:	Answer A is correct because the command ifconfig -a inet6 verifies the status of IPv6 network interfaces. It does not show the status of any IPv4 interfaces. Answer B is incorrect because the syntax of the ifconfig command is wrong. The first argument must be a valid command option, such as -a , or a network interface, such as hme0 . Answer C is incorrect because the syntax is wrong. Answer D is incorrect because there is no such network family as ip6 .
Question 3	Why would you need to configure an IPv6-over-IPv4 tunnel? A. To allow IPv4 hosts to communicate over an IPv6 network. B. To allow IPv6 hosts to communicate over an IPv4 network. C. To connect an IPv6 network to an IPv4 network. D. To provide an additional network path for IPv4 hosts on the network.
A3:	Answer B is correct because an IPv6-over-IPv4 tunnel is used to allow IPv6 hosts to communicate with each other through the use of an IPv4 network. Answer A is incorrect because an IPv6-over-IPv4 tunnel does not allow IPv4 hosts to communicate over an IPv6 network ”the tunnel has been introduced to aid the transition from IPv4 to IPv6. Answer C is incorrect because an IPv6-over-IPv4 tunnel is not used to connect networks together; it is used to allow IPv6 hosts to communicate over an IPv4 network. Answer D is incorrect; IPv4 hosts do not make use of an IPv6-over-IPv4 tunnel. The purpose of the tunnel is to allow IPv6 hosts to communicate with each other within the existing IPv4 network.
Question 4	You are creating an IPv6-over-IPv4 tunnel, called ip.tunz . To make the tunnel configuration persist across reboots, which configuration file would you create? A. /etc/hostname.ip.tunz B. /etc/hostname6.hme0 C. /etc/hostname6.ip.tunz D. /etc/hostname.hme0
A4:	Answer C is correct because the configuration file /etc/hostname6.ip.tunz would be used to create a permanent tunnel called ip.tunz . Answer A is incorrect because the configuration file /etc/hostname.ip.tunz would refer to an IPv4 interface. Answer B is incorrect because the configuration file /etc/hostname6.hme0 is the file that would be used to configure a primary network interface for use with IPv6. It would not be used for an IPv6-over-IPv4 tunnel. Answer D is incorrect because the configuration file /etc/hostname.hme0 would be used to configure the primary network interface for use with IPv4.
Question 5	Which command would successfully unconfigure and remove the IPv6-over-IPv4 tunnel, ip.tun0 ? A. ifconfig inet6 down ip.tun0 B. ifconfig ip.tun0 inet6 down unplumb C. ifconfig down unplumb ip.tun0 inet6 D. ifconfig inet6 ip.tun0 down unplumb
A5:	Answer B is correct because the command ifconfig ip.tun0 inet6 down unplumb would successfully unconfigure and remove the tunnel ip.tun0 . Answers A, C, and D are incorrect because the syntax for the ifconfig command is wrong.
Question 6	Which of the following statements are true with regard to IPv6-over-IPv4 tunnels? Choose 2. A. The sender and the receiver support both IPv4 and IPv6, but the intervening routers and hosts only need to support IPv4. B. All hosts and routers between the sender and receiver support IPv6. C. The IPv6 data is transported across the network in special IPv6 datagrams, which are recognized by the IPv4 network. D. The IPv6 data is encapsulated into IPv4 datagrams and transported across the network. E. The sender and the receiver need to support only IPv4, because the data is encapsulated into IPv4 datagrams.
A6:	Answers A and D are correct because the sender and the receiver support both IPv4 and IPv6. The intervening hosts and routers along the path between the sender and receiver need to support only IPv4. The IPv6 data is encapsulated into IPv4 datagrams for transportation across the IPv4 network. Answer B is incorrect because the hosts and routers along the path between the sender and the receiver need to support only IPv4 because the data is transported in IPv4 datagrams. Answer C is incorrect because the IPv6 data is transported across the network in IPv4 datagrams. Answer E is incorrect because the sender and the receiver need to support both IPv4 and IPv6 ”the IPv6 data is encapsulated into IPv4 datagrams for transportation across the network.