IPV4 Addressing Flashcards
What address is 127.0.0.1 ?
Local host. Address of home Computer.
There’s no place like 127.0.0.1
255 in binary
1111 1111
What does APIPA stand for ?
Automatic Private IP Addressing.
Broadcast Address
Used if you want to send a packet to all devices on the network.
The last available IP address within your scope is reserved for this.
How many Network and Host bits in a Class A network.
Network = 8 bits Host = 24 bits
Class A network subnet mask
255.0.0.0
Class A network octet range
1 - 127
1.0.0.0 - 127.0.0.0
Class A network private addresses
10.0.0.0 - 10.255.255.255
How many Network and Host bits in a class B network ?
Network = 16 Host = 16
Class B network subnet mask
255.255.0.0
Class B Octet range
128 - 191
Class B private Addresses
172.16.0.0 - 172.31.0.0
Network and Host bits in a Class C network
Network = 24 Host = 8
Class C Subnet Mask
255.255.255.0
Class C Network octet range
192 - 223
Class C Private Addresses
192.168.0.0 - 192.168.255.254
Class D octet range
224 - 239
Class E octet range
240 - 255
Formula for how many hosts on a network
2 to the power of N-2
2n -2
Formula for how many network addresses in network class
2 to the power of N
2n
How is an IPv4 address written
As a dotted quad.
4 number separated by full stops
e.g. 192.168.112.20
How many unique hosts can a Class C network have?
254
How many IPv4 addresses are reserved and not available to the public ?
Around 600 million
Roughly how many IPv4 addresses are there?
Around 4 billion
In what way is IPv4 limited?
There are not enough unique addresses for everyone on the planet.
What addresses are reserved for loopback
127.0.0.1 - 127.255.255.254
What are some uses of IP addresses that make them unavailable to the public?
Private Addressing
Testing
Documentation
What is CIDR ?
Classless Inter Domain Routing
When you add a /# e.g /24 at the end of an IP address to let you know how many numbers in the IP address are in the network bit. In this case 24 bits.
What is an IP address used for ?
Uniquely identifying a device on a network.
Why is a 32-bit IPv4 Address written as a dotted quad?
To improve readability for humans.
The computer converts this number into binary using a 32-bit long string of 1’s and 0’s
What do Subnet Masks do ?
Distinguish the Network portion from the Host portion on an IP address
What are Class D hosts uses for ?
Multicast
What are Class E hosts used for
Reserved for research purposes, military etc
They are kept hidden from the general public.
What Automatic Private IP Addressing addresses are not available to the public
169.254.0.0 to 169.254.255.255
1111 1111 in Decimal
255
Address class reserved for research purposes, military etc They are kept hidden from the general public.
Class E
Address class used for Multicast ?
Class D
Distinguishes the Network portion from the Host portion
Subnet Masks
What class of network has the octet range 240 - 255
Class E
What class of network has the octet range 224 - 239
Class D
What are the addresses 192.168.0.0 - 192.168.255.254
Private Class C addresses
What class of network has the addresses 192 - 223
Class C
What are the addresses 172.16.0.0 - 172.31.0.0
Class B private Addresses
What class of network has the address range 128 - 191
Class B
Used if you want to send a packet to all devices on the network.
The last available IP address within your scope is reserved for this.
Broadcast address
169.254.0.0 to 169.254.255.255
APIPA Addresses
Automatic Private IP Addressing
Binary 1 in the subnet mask =
A network bit
Binary 0 in the subnet mask =
A host bit
The first valid host on a network is usually given to what device ?
A router
What device usually gets the last valid host on a network ?
The Server
