IPV4 Addressing Flashcards

1
Q

What address is 127.0.0.1 ?

A

Local host. Address of home Computer.

There’s no place like 127.0.0.1

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2
Q

255 in binary

A

1111 1111

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3
Q

What does APIPA stand for ?

A

Automatic Private IP Addressing.

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4
Q

Broadcast Address

A

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.

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5
Q

How many Network and Host bits in a Class A network.

A
Network = 8 bits
Host = 24 bits
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6
Q

Class A network subnet mask

A

255.0.0.0

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7
Q

Class A network octet range

A

1 - 127

1.0.0.0 - 127.0.0.0

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8
Q

Class A network private addresses

A

10.0.0.0 - 10.255.255.255

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9
Q

How many Network and Host bits in a class B network ?

A
Network = 16
Host = 16
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10
Q

Class B network subnet mask

A

255.255.0.0

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11
Q

Class B Octet range

A

128 - 191

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12
Q

Class B private Addresses

A

172.16.0.0 - 172.31.0.0

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13
Q

Network and Host bits in a Class C network

A
Network = 24
Host = 8
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14
Q

Class C Subnet Mask

A

255.255.255.0

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15
Q

Class C Network octet range

A

192 - 223

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16
Q

Class C Private Addresses

A

192.168.0.0 - 192.168.255.254

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17
Q

Class D octet range

A

224 - 239

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18
Q

Class E octet range

A

240 - 255

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19
Q

Formula for how many hosts on a network

A

2 to the power of N-2

2n -2

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20
Q

Formula for how many network addresses in network class

A

2 to the power of N

2n

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21
Q

How is an IPv4 address written

A

As a dotted quad.
4 number separated by full stops
e.g. 192.168.112.20

22
Q

How many unique hosts can a Class C network have?

A

254

23
Q

How many IPv4 addresses are reserved and not available to the public ?

A

Around 600 million

24
Q

Roughly how many IPv4 addresses are there?

A

Around 4 billion

25
Q

In what way is IPv4 limited?

A

There are not enough unique addresses for everyone on the planet.

26
Q

What addresses are reserved for loopback

A

127.0.0.1 - 127.255.255.254

27
Q

What are some uses of IP addresses that make them unavailable to the public?

A

Private Addressing
Testing
Documentation

28
Q

What is CIDR ?

A

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.

29
Q

What is an IP address used for ?

A

Uniquely identifying a device on a network.

30
Q

Why is a 32-bit IPv4 Address written as a dotted quad?

A

To improve readability for humans.

The computer converts this number into binary using a 32-bit long string of 1’s and 0’s

31
Q

What do Subnet Masks do ?

A

Distinguish the Network portion from the Host portion on an IP address

32
Q

What are Class D hosts uses for ?

A

Multicast

33
Q

What are Class E hosts used for

A

Reserved for research purposes, military etc

They are kept hidden from the general public.

34
Q

What Automatic Private IP Addressing addresses are not available to the public

A

169.254.0.0 to 169.254.255.255

35
Q

1111 1111 in Decimal

A

255

36
Q
Address class reserved for research purposes, military etc
They are kept hidden from the general public.
A

Class E

37
Q

Address class used for Multicast ?

A

Class D

38
Q

Distinguishes the Network portion from the Host portion

A

Subnet Masks

39
Q

What class of network has the octet range 240 - 255

A

Class E

40
Q

What class of network has the octet range 224 - 239

A

Class D

41
Q

What are the addresses 192.168.0.0 - 192.168.255.254

A

Private Class C addresses

42
Q

What class of network has the addresses 192 - 223

A

Class C

43
Q

What are the addresses 172.16.0.0 - 172.31.0.0

A

Class B private Addresses

44
Q

What class of network has the address range 128 - 191

A

Class B

45
Q

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.

A

Broadcast address

46
Q

169.254.0.0 to 169.254.255.255

A

APIPA Addresses

Automatic Private IP Addressing

47
Q

Binary 1 in the subnet mask =

A

A network bit

48
Q

Binary 0 in the subnet mask =

A

A host bit

49
Q

The first valid host on a network is usually given to what device ?

A

A router

50
Q

What device usually gets the last valid host on a network ?

A

The Server