IPv4 Address Structure Quiz Flashcards
What dose the term “network as a range of addresses” mean?
All devices on the same network have the same network portion (Network ID) but a different host portion (Host ID)
What are the four important IPv4 addresses to determine?
Network Address (the first address in the range),
Broadcast Address (last address in the range),
Fisrt usable host (address after the network address), and
Last usable host (address before the broadcast address)
What are the two special reserved addresses on every network that can’t be assigned to a host?
The network address (lowest) and the broadcast address (highest)
Host-A has the IPv4 address and subnet mask 172.16.4.100 255.255.0.0. What is the network address of Host-A?
172.16.0.0
Which statement describes IPv4 addressing?
Routers use the full 32-bit IP address to determine the location of each individual host.
The network portion of a destination IP address is obtained by performing an AND operation between a host IP address and a subnet mask.
An IPv4 address contains two parts: a network portion and a subnet portion.
Two hosts with the same subnet mask are in the same network.”
The network portion of a destination IP address is obtained by performing an AND operation between a host IP address and a subnet mask.
Explanation: An IPv4 address consists of two parts: the network portion and the host portion. Routers just need to know the network portion of each IP address to forward the packet to its destination. When a router needs to identify the network portion of an IPv4 address, an AND operation is performed between the IP address and the subnet mask. The subnet mask identifies the network portion of the host IP address, not the network IP address itself, and that is why two hosts with the same subnet mask are not necessarily in the same network.
“Which statement describes one purpose of the subnet mask setting for a host?
It is used to describe the type of the subnet.
It is used to identify the default gateway.
It is used to determine to which network the host is connected.
It is used to determine the maximum number of bits within one packet that can be placed on a particular network.”
It is used to determine to which network the host is connected.
How many octets exist in an IPv4 address?
4
Explanation: Each octet holds 8 bits and an IPv4 address contains 32 bits. Therefore, an IPv4 address contains four octets.
Which full range of decimal values are valid in one octet of an IPv4 address?
0 through 255
Explanation: An octet can contain 8 bits. Each bit can be a 1 or a 0 because the binary system is used. To determine the number of values that can be represented by a specific number of bits, use the formula 2x where the x represents a specific number of bits. For 8 bits, 28 = 256. The numbers 0 through 255 are the valid values. Another way of looking at it is that the lowest value would be 8 0’s or 00000000 (decimal 0). The highest value is 8 1’s or 11111111 (decimal 255).
For what purpose are IPv4 addresses utilized?
An IPv4 address is used to uniquely identify a device on an IP network.
What is the prefix length notation for the subnet mask 255.255.255.224?
/27
Explanation: The binary format for 255.255.255.224 is 11111111.11111111.11111111.11100000. The prefix length is the number of consecutive 1s in the subnet mask. Therefore, the prefix length is /27.
“Which two parts are components of an IPv4 address? (Choose two.)
subnet portion
network portion
logical portion
host portion
physical portion
broadcast portion”
network portion & host portion
What is obtained when ANDing the address 192.168.65.3/18 with its subnet mask?
192.168.64.0
Explanation: The value of the IP address 192.168.65.3 in binary is 11000000.10101000.01001110.00000011. The value of the subnet mask in binary is 11111111.11111111.11000000.00000000. When ANDing the two, the result is 11000000.10101000.01000000.00000000, which in turn converts into 192.168.64.0.
What do devices on the same IPv4 subnet have in common?
They all use the same default gateway.
Explanation: Devices on the same subnet will share the same network number, subnet mask, and default gateway. The default gateway is the IPv4 address of the Layer 3 device that allows the devices on the same subnet to communicate with other networks.
How many unique addresses are available for assignment to hosts in the network of 10.100.16.0 with subnet mask 255.255.252.0?
1022
Explanation: To calculate how many unique addresses are available with a given network and subnet mask use the following formula:
2^n – 2 = number of addresses
where n = the number of low order bits representing host bits.
2^10 – 2 = 1022
Which is a valid default gateway address for a host configured with IP address 10.25.1.110 and a subnet mask of 255.255.255.192?
10.25.1.65
Explanation: To be valid, the default gateway address must be on the same subnet as the host. A host with an IP address 10.25.1.110 and a subnet mask of 255.255.255.192 is a member of the 10.25.1.64 subnet. This subnet has a usable host address range of 10.25.1.65 through 10.25.1.126. Any address within that range, with the exception of the address configured already on the host and the broadcast address of the subnet, is valid for a default gateway.
