IPv6 -4

Question 1

Which statement is true about IPv6?

A. Only one IPv6 address is assigned per node.
B. Only one IPv6 address can be assigned to each interface.
C. Each host can auto configure its address without the aid of a DHCP server.
D. IPv6 hosts use any cast addresses to assign IP addresses to interfaces.

Answer: C

Question 2

What is IPv6 router solicitation?

A. a request made by a node to join a specified multicast group
B. a request made by a node for its IP address
C. a request made by a node for the IP address of the DHCP server
D. a request made by a node for the IP address of the local router

Answer: D

Question 3

Which statement describes the difference between a manually configured IPv6 in IPv4 tunnel versus an automatic 6to4 tunnel?

A. A manually configured IPv6 in IPv4 tunnel allows multiple IPv4 destinations.
B. An automatic 6to4 tunnel allows multiple IPv4 destinations.
C. A manually configured IPv6 in IPv4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
D. An automatic 6to4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.

Answer: B

Explanation

An automatic 6to4 tunnel allows isolated IPv6 domains to be connected over an IPv4 network to remote IPv6 networks. The key difference between automatic 6to4 tunnels and manually configured tunnels is that the tunnel is not point-to-point; it is point-to-multipoint -> it allows multiple IPv4 destinations -> B is correct.

A is not correct because manually 6to4 is point-to-point -> only allows one IPv4 destination.

Configuring 6to4 (manually and automatic) requires dual-stack routers (which supports both IPv4 & IPv6) at the tunnel endpoints because they are border routers between IPv4 & IPv6 networks.

(Reference: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1055515)

Question 4

Which two statements are true about using IPv4 and IPv6 simultaneously on a network segment? (Choose two)

A. Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP.
B. Host configuration: options for IPv4 can be either statically assigned or assigned via DHCP. Host configuration: options for IPv6 can be statically assigned only.
C. IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts.
D. IPv4 and IPv6 addresses can be simultaneously assigned to a host but not to a router interface.
E. IPv6 provides for more host IP addresses but IPv4 provides for more network addresses.

Answer: A C

Question 5

By default, which type of IPv6 address is used to build the EUI-64 bit format?

A. unique-local address
B. IPv4-compatible IPv6 address
C. link-local address
D. aggregatable-local address

Answer: ?

Explanation

In fact this question has no correct answer. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted between these two 24-bits to for the 64-bit EUI address. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address.

For example, the MAC address C601.420F.0007 is divided into two 24-bit parts, which are “C60142” (OUI) and “0F0007” (NIC). Then “FFFE” is inserted in the middle. Therefore we have the address: C601.42FF.FE0F.0007.

Question 6

Refer to the exhibit. Given the partial configuration in the exhibit, which IPv6 statement is true?

A. The configuration is an example of an encrypted IPv6 VPN tunnel
B. The configuration is an example of one to one IPv6 tunnel
C. The configuration is an example of a 6to4 tunnel
D. The configuration is an example of a 4to6 tunnel

Answer: C

Explanation

6to4 tunnel is a technique which relies on reserved address space 2002::/16 (you must remember this range). These tunnels determine the appropriate destination address by combining the IPv6 prefix with the globally unique destination 6to4 border router’s IPv4 address, beginning with the 2002::/16 prefix, in this format:

2002:border-router-IPv4-address::/48

For example, if the border-router-IPv4-address is 192.168.99.1, the tunnel interface will have an IPv6 prefix of 2002:C0A8:6301::/64, where C0A8:6301 is the hexadecimal equivalent of 192.168.99.1.

Question 7

What other action does an IPv6 filter do when it drops a packet?

A. Generates an ICMP unreachable message
B. Generates an Router Advertisement unreachable message
C. Generates an Router Solicitation unreachable message

Answer: A