1. Which two statements are correct about IPv4 and IPv6 addresses? (Choose two.)
- IPv4 addresses are 32 bits in length.
- IPv6 addresses are 32 bits in length.
- IPv6 addresses are represented by hexadecimal numbers.
- IPv4 addresses are represented by hexadecimal numbers.
- IPv6 addresses are 64 bits in length.
- IPv4 addresses are 128 bits in length.
Explanation: IPv4 addresses are represented as dotted decimal numbers and are 32 bits in length. IPv6 addresses are represented by hexadecimal numbers and are 128 bits in length.
2. Which network technology allows devices to communicate using both IPv4 and IPv6 addressing at the same time?
- dual stack
- SLAAC
- tunneling
- NAT64
Explanation: Dual stack allows IPv4 and IPv6 protocol stacks to function on devices at the same time. This allows devices to communicate on a network that uses both IPv4 addressing and IPv6 addressing simultaneously.
3. What is an advantage of using IPv6 ?
- higher bandwidth
- more frequencies
- more addresses for networks and hosts
- faster connectivity
Explanation: An IPv6 address is comprised of 128 bits as opposed to 32 bits in an IPv4 address. Thus it offers far more addresses for networks and hosts than an IPv4 address does.
4. Which characteristic describes the default gateway of a host computer?
- the physical address of the switch interface connected to the host computer
- the logical address of the router interface on the same network as the host computer
- the logical address assigned to the switch interface connected to the router
- the physical address of the router interface on the same network as the host computer
Explanation: The default gateway is the IP address of an interface on the router on the same network as the sending host.
5. Which number grouping is a valid IPv6 address?
- 1234:1230::1238::1299:1000::
- 12aa::1298:1200::129b
- 1b10::1100::2001::2900::ab11::1102::0000::2900
- 2001:0db8:3c55:0015:1010:0000:abcd:ff13
Explanation: An IPv6 address is made up of 128 bits represented in hexadecimal numbers. There are two rules that help reduce the number of digits needed to represent an IPv6 address.
- Rule 1 – Omit leading zeros in any 16-bit section.
- Rule 2 – Replace any single group of consecutive zeros with a double colon (::). This can only be used once within an IPv6 address.
6. Which method of IPv6 prefix assignment relies on the prefix contained in RA messages?
- EUI-64
- static
- stateful DHCPv6
- SLAAC
Explanation: Stateless Address Autoconfiguration (SLAAC) relies on information received in router advertisement (RA) messages in order to automatically create an IPv6 address. The RA messages contain information such as the network prefix and prefix length, which the host combines with an interface ID in order to make a unique IPv6 unicast address.
7. Which IPv6 address notation is valid?
- 2001:0DB8::ABCD::1234
- ABCD:160D::4GAB:FFAB
- 2001::ABCD::
- 2001:DB8:0:1111::200
Explanation: IPv6 addresses are represented by 32 hexadecimal digits (0-9, A-F). The size of the notation can be reduced by eliminating leading zeroes in any hextet and by replacing a single, contiguous string of hextets containing all zeroes with a double colon, which can only be used one time.
8. Typically, which network device would be used to perform NAT for a corporate environment?
- router
- server
- DHCP server
- switch
- host device
Explanation: Typically, the translation from private IP addresses to public IP addresses is performed on routers in corporate environments. In a home environment, this device might be an access point that has routing capability or the DSL or cable router.
9. What type of IPv6 address is FE80::1?
- global unicast
- loopback
- multicast
- link-local
Explanation: Link-local IPv6 addresses start with FE80::/10, which is any address from FE80:: to FEBF::. Link-local addresses are used extensively in IPv6 and allow directly connected devices to communicate with each other on the link they share.
10. Which network migration technique encapsulates IPv6 packets inside IPv4 packets to carry them over IPv4 network infrastructures?
- dual-stack
- encapsulation
- translation
- tunneling
Explanation: The tunneling migration technique encapsulates an IPv6 packet inside an IPv4 packet. Encapsulation assembles a message and adds information to each layer in order to transmit the data over the network. Translation is a migration technique that allows IPv6-enabled devices to communicate with IPv4-enabled devices using a translation technique similar to NAT for IPv4. The dual-stack migration technique allows IPv4 and IPv6 protocol stacks to coexist on the same network simultaneously.