2.6 – Explain common network configuration concepts

Question 1

Which of these addresses needs to be configured to enable a computer access to
the Internet or to other networks?
 ❍ A. Subnet mask
 ❍ B. Gateway address
 ❍ C. DNS address
 ❍ D. MAC address

Answer 1

B. The gateway address must be configured to enable a computer access to
the Internet through the gateway device. By default, the subnet mask defines
the IP address’s network and host portions. The DNS server takes care of name
resolution. The MAC address is the address that is burned into the network
adapter; it is configured at the manufacturer.

Question 2

Which technology assigns addresses on the 169.254.0.0 network number?
 ❍ A. DHCP
 ❍ B. Static IP
 ❍ C. APIPA
 ❍ D. Class B

Answer 2

C. If you see an address with 169.254 as the first two octets, then it is Automatic
Private IP Addressing (APIPA). This is also the link-local range for IPv4. The
Dynamic Host Configuration Protocol (DHCP) assigns IP addresses automatically
to clients but by default does not use the 169.254 network number. Static IP
addresses are configured manually by the user in the IP Properties window. Class
B is a range of IP networks from 128 through 191.

Question 3

You want to test the local loopback IPv6 address. Which address would you use?
 ❍ A. 127.0.0.1
 ❍ B. ::1
 ❍ C. FE80::/10
 ❍ D. ::0

Answer 3

B. You would use the ::1 address. That is the local loopback address for IPv6.
127.0.0.1 is the local loopback for IPv4. FE80::/10 is the range of unicast
auto-configured addresses. ::0 is not valid but looks similar to how multiple zeros
can be truncated with a double colon.

Question 4

You have been tasked with compartmentalizing the network. Which of the
following technologies should you use?
 ❍ A. APIPA
 ❍ B. VPN
 ❍ C. VLAN
 ❍ D. IPv6

Answer 4

C. You would create a virtual LAN (VLAN). Another valid option would be to
implement IP subnetting. APIPA (also known as link-local) is an IP technology that
auto-assigns addresses on the 169.254 network. A virtual private network (VPN)
allows remote clients to connect to a network over the Internet using a secure
tunnel. IPv6 in of itself does not compartmentalize the network. However, an IPv6
network that has been subnetted would be acceptable.