Day 5 Quiz - Addressing & Subnetting

Objective 1.4/Day 5 -

What is the IPv6 equivalent of 127.0.0.1? (Choose two.)

• 0:0:0:0:0:0:0:1

• 0:0:0:0:0:0:0:24

• ::1

• ::24

Answer explanation

The IPv4 address 127.0.0.1 is reserved as the loopback address, and IPv6 has the same reservation. IPv6 addresses 0:0:0:0:0:0:0:0 and 0:0:0:0:0:0:0:1 are reserved as the loopback addresses. The address 0:0:0:0:0:0:0:1 can be shown using the :: notation with the 0s removed, resulting in ::1.

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Objective 1.4

Objective 1.4/Day 5 -

You are the administrator for a network with two Windows Server systems and 65 Windows desktop systems. At 10 a.m., three users call to report that they are experiencing network connectivity problems. Upon investigation, you determine that the DHCP server has failed. How can you tell that the DHCP server failure is the cause of the connectivity problems experienced by the three users?

• When you check their systems, they have an IP address of 0.0.0.0.

• When you check their systems, they have an IP address in the 192.168.x.x address range.

• When you check their systems, they have a default gateway value of 255.255.255.255.

• When you check their systems, they have an IP address from the 169.254.x.x range.

Answer explanation

When a Windows desktop system that is configured to obtain an IP address via DHCP fails to obtain an address, it uses APIPA to assign itself an address from the 169.254.x.x address range. An address of 0.0.0.0 normally results from a system that does not support APIPA. APIPA does not use the 192.168.x.x address range. The IP address 255.255.255.255 is the broadcast address. A DHCP failure would not lead to a system assigning itself this address.

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Objective 1.4

Objective 1.4/Day 5 -

Which of the following IP addresses is not from a private address range?

• 192.168.200.117

• 172.16.3.204

• 127.45.112.16

• 10.27.100.143

Answer explanation

The 127.x.x.x network range is reserved for the loopback function. It is not one of the recognized private address ranges. The private address ranges as defined in RFC 1918 are 10.x.x.x, 172.16.x.x to 172.31.x.x, and 192.168.x.x.

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Objective 1.4

Objective 1.4/Day 5 -

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

In CIDR terminology, the number of bits to be included in the subnet mask is expressed as a slash value. If the slash value is 24, the first three octets form the subnet mask, so the value is 255.255.255.0.

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Objective 1.4

Objective 1.4/Day 5 -

Which of the following best describes the function of the default gateway?

• It provides the route for destinations outside the local network.

• It enables a single Internet connection to be used by several users.

• It identifies the local subnet and formulates a routing table.

• It is used to communicate in a multiple-platform environment.

Answer explanation

The default gateway enables systems on one local subnet to access those on another.

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Objective 1.4

Objective 1.4/Day 5 -

Which of the following bits of IP information are mandatory to join the network? (Choose two.)

• Subnet mask

• IP address

• DNS address

• Default gateway

Answer explanation

Configuring a client requires at least the IP address and a subnet mask. The default gateway, DNS server, and WINS server are all optional, but network functionality is limited without them.

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Objective 1.4

Objective 1.4/Day 5 -

Which of the following is a Class B address?

• 129.16.12.200

• 126.15.16.122

• 211.244.212.5

• 193.17.101.27

Answer explanation

Class B addresses fall into the range 128 to 191.

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Objective 1.4

Objective 1.4/Day 5 -

Which of the following address types are associated with IPv6? (Choose three.)

• Broadcast

• Multicast

• Unicast

• Anycast

Answer explanation

A key difference between IPv4 and IPv6 is in the address types. IPv6 addressing has three main types of addresses: unicast, multicast, and anycast. IPv4 uses broadcast addressing, but IPv6 doesn’t.

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Objective 1.4

Objective 1.4/Day 5 -

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

The 131.16 range is from the Class B range and is not one of the recognized private IP address ranges. All the other address ranges are valid private IP address ranges.

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Objective 1.4

Objective 1.4/Day 5 -

A company needs to set up a new internal network and decides to use private IP addresses according to RFC1918. They need to accommodate a network with up to 500 devices. Which private IP address range is most suitable for this scenario?

• 192.168.0.0/24

• 172.16.0.0/16

• 10.0.0.0/24

• 192.0.2.0/24

Answer explanation

The 172.16.0.0/16 address range allows for 65,536 addresses, which can accommodate a large network of up to 500 devices. RFC1918 defines 172.16.0.0/12 as a private address range suitable for internal use.