Elective 1: PreFi Flashcards
N = the Network Number that is assigned by the ___
American Registry for Internet Numbers (ARIN)
H = the Host Number that is assigned by the ___
network administrator
N.H.H.H
Class A
0 - 126 range
Class A
Has 24 bits (3 ang H)
Class A
2 to-the-power-of 24 (2^24) minus ___ - possible IP addresses to devices that are attached to its network.
Class A
216,777,214
__ address is always 0.
Class A
N.N.H.H
Class B
__ address are always 10 (one and zero).
Class B
Has 16 bits (2 ang H)
Class B
128 - 191 range
Class B
2 to-the-power-of 16 (2^16) minus 2
__ possible IP addresses to devices that are attached to its network.
Class B
65,534
Class C address are always 110 (one, one, and zero).
Class C
Has 8 bits ( 1 ang H)
Class C
192 - 223 range
Class C
2 to-the-power-of 8 (2^8) minus 2
___ possible IP addresses to devices that are attached to its network.
Class C
254
An __ is made up of 32 bits broken down into 4 Octets (8 bits each)
IP Address
11000000.00001100.00000101.10101010 or 192.12.2.170
Dotted Decimal
An IP address that ends with binary 0s in all host bits is reserved for the network address (sometimes called the ____).
wire address
If you wanted to send data to all of the devices on a network, you would need to use this
Broadcast Address
____ addresses end with binary 1s in the entire host part of the address (the host field).
Broadcast Address
Broadcast IP
occurs when a source sends out data to all devices on a network.
Broadcast Address
All 0’s in the host address is the ___
Network Number
All 1’s in the host address is the ___
Broadcast Address
(formal term: extended network prefix)
Subnet Mask
tells the network devices which part of an address is the network field and which part is the host field.
Subnet Mask
A subnet mask is 32 bits long and has 4 octets, just like an IP
address.
Subnet Mask
- Borrowing 2 bits creates four possible subnets (2x2), but you must always remember that there are two reserved/unusable subnets.
Each time you borrow another bit from the host field, the number of subnets created increases by a power of 2.
- The eight possible subnets that are created by borrowing 3 bits is
equal to 23 (2 x 2 x 2). The sixteen possible subnets created by borrowing 4 bits is equal to 24 (2 x 2 x 2 x 2). From these examples,
it is easy to see that each time you borrow another bit from the host field, the number of possible subnets doubles.
Subnetting
The formula for calculating USEABLE Subnets:
2^b - 2 = useable subnets
The formula for calculating USEABLE Hosts:
2^u - 2 = useable hosts
DHCP
Dynamic Host Configuration Protocol.
a service which allows you to configure TCP/ IP settings such as IP address and subnet mask on the clients (PC, laptop, printer, etc.) automatically.
DHCP
in a Class B network, the default subnet mask is 255.0.0.0.
True:
A Class C network can have a maximum of 254 hosts.
True:
In CIDR notation, the number after the slash represents the host bits in the subnet mask.
True:
Subnetting allows you to divide a single network into smaller networks, each with its own subnet mask.
True:
A broadcast address always ends with at host bits set to 1.
True:
The loopback address in IPv4 is 127.0.0.1.
True:
in a Class A network, the first octet represents the network portion of the IP address.
True:
A Class D IP address is used for multicast communication.
True:
The subnet mask 255.255.255.224 has 8 host bits.
True:
The broadcast address for a subnet is always the first address in the subnet’s address range.
False:
A Class A network can have up to 16,777,214 hosts.
True:
The subnet mask 255.255.255.0 has 24 bits for the network portion.
True:
A Class B network address ranges from 128.0.0.0 to 191.255.255.255.
True:
The subnet mask 255.255.255.128 allows for 126 usable host addresses.
True:
An IP address of 10.0.0.1 is a valid address for a Class B network.
A Class C network address ranges from 192.0.0.0 to 223.255.255.255.
True:
The subnet mask 255.255.255.240 allows for 14 usable host addresses.
True:
The first octet in an IP address determines the class of the network.
True:
The subnet mask 255.255.254.0 has 23 bits for the network portion.
True:
