You have been assigned to set up a new network with TCP/IP. For the external interfaces, you decide to obtain registered IP addresses from your ISP, but for the internal network, you choose to configure systems by using one of the private address ranges. Of the following address ranges, which one would you not consider?

• 192.168.0.0 to 192.168.255.255

• 131.16.0.0 to 131.16.255.255

• 10.0.0.0 to 10.255.255.255

• 172.16.0.0 to 172.31.255.255

Answer explanation

You would not consider the range 131.16.0.0 to 131.16.255.255 as it is not part of the private address ranges commonly used for internal networks.

You ask your ISP to assign a public IP address for the external interface of your Windows server, which is running a proxy server application. In the email message that contains the information, the ISP tells you that you have been assigned the IP address 203.15.226.12/24. When you fill out the subnet mask field on the IP configuration dialog box on your system, what subnet mask should you use?

• 255.255.255.255

• 255.255.255.0

• 255.255.240.0

• 255.255.255.240

Answer explanation

The correct subnet mask to use for the IP address 203.15.226.12/24 is 255.255.255.0, as the /24 notation indicates a subnet mask of 255.255.255.0.

Examine the diagram shown here. What is the most likely reason that user Spencer cannot communicate with user Evan?

• The default gateways should have different values.

• Spencer’s IP address is not a loopback address.

• The subnet values should be the same.

• There is no problem identifiable by the values given.

Answer explanation

The subnet values should be the same.

Which of the following address ranges do Class B addresses fall into?

• 1 to 126

• 128 to 191

• 192 to 223

• 224 to 239

Answer explanation

Class B addresses fall into the range of 128 to 191, as specified in the IP address allocation standards.

What does a Windows desktop system use to assign itself an address if DHCP fails?

• 192.168.x.x

• 0.0.0.0

• 255.255.255.255

• 169.254.x.x

Answer explanation

A Windows desktop system uses the 169.254.x.x address range to assign itself an address if DHCP fails, known as Automatic Private IP Addressing (APIPA).

Which of the following is NOT a type of address in IPv6?

• Unicast

• Multicast

• Broadcast

• Anycast

Answer explanation

The correct choice is 'Broadcast' because IPv6 does not use broadcast addresses, unlike IPv4. IPv6 uses Unicast, Multicast, and Anycast addresses for communication.

What is the 127.x.x.x network range reserved for?

• Private IP addresses

• Public IP addresses

• Loopback function

• Multicast addresses

Answer explanation

The 127.x.x.x network range is reserved for the loopback function, allowing a device to send a message to itself for testing purposes.

Which of the following ranges is from the Class B range and not a recognized private IP address range?

• 10.x.x.x

• 131.16.x.x

• 172.16.x.x to 172.31.x.x

• 192.168.x.x

Answer explanation

The correct choice is 131.16.x.x because it falls outside the Class B range and is not a recognized private IP address range.

In CIDR terminology, what is the subnet mask value if the slash value is 24?

• 255.0.0.0

• 255.255.0.0

• 255.255.255.0

• 255.255.255.255

Answer explanation

In CIDR terminology, a slash value of 24 corresponds to a subnet mask of 255.255.255.0, where the first 24 bits are set to 1 (255) and the last 8 bits are set to 0.

What is the most likely problem if the subnet value is not correct on a user's machine?

• Incorrect IP address

• Incorrect gateway

• Incorrect subnet mask

• Incorrect DNS server

Answer explanation

If the subnet value is not correct on a user's machine, the most likely problem is an incorrect subnet mask, as it defines the network portion of the IP address and is crucial for proper communication within the network.