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Computer Networking > IPv4 Addressing > Flashcards

IPv4 Addressing Flashcards

1
Q

What are the possible first octet values of a Class A network?

A

1-127

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2
Q

What is the Default Subnet Mask of a Class A network?

A

255.0.0.0

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3
Q

How many possible hosts can there be on a Class A network?

A

16.7 million

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4
Q

What is the CIDR Notation for a Class A network?

A

/8

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5
Q

What are the possible first octet values of a Class B network?

A

128-191

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6
Q

What is the Default Subnet Mask of a Class B network?

A

255.255.0.0

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7
Q

How many possible hosts can there be on a Class B network?

A

65,536

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8
Q

What is the CIDR Notation for a Class B network?

A

/16

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9
Q

What are the possible first octet values of a Class C network?

A

192-223

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10
Q

What is the Default Subnet Mask of a Class C network?

A

255.255.255.0

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11
Q

How many possible hosts can there be on a Class C network?

A

256

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12
Q

What is the CIDR Notation for a Class C network?

A

/24

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13
Q

What are the possible first octet values of a Class D network?

A

224-239

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14
Q

What are the possible first octet values of a Class E network?

A

240-255

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15
Q

How many possible hosts can there be on a Class E network?

A

268 million, which are all reserved for experimental purposes

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16
Q

Multicast Address

A

Logical identifier for a group of hosts in a computer network (like a group chat)

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17
Q

Classful Mask

A

Default subnet mask for a given class of IP addresses

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18
Q

Classless Inter-Domain Routing

A

Allows for the borrowing of some of the host bits and reassigning them to the network portion of the subnet mask

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19
Q

Subnetting

A

Allows for the use of a classless subnet mask to create smaller networks with fewer hosts in each network
Process is called CIDR (Classless Inter-Domain Routing) Notation

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20
Q

NAT

A

Network Address Translation
Allows for routing of private IPs through a public IP

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21
Q

What is the IP range for a Private Class A network?

A

10.x.x.x

22
Q

How many possible hosts can a Private Class A Network have?

A

16.7 million

23
Q

What is the IP range for a Private Class B Network?

A

172.16.x.x - 172.31.x.x

24
Q

How many possible hosts can a Private Class B Network have?

A

1.05 million

25
Q

What is the IP range for a Private Class C Network?

A

192.168.x.x

26
Q

How many possible hosts can a Private Class C Network have?

A

65,536

27
Q

Loopback Address

A

127.0.0.1
Creates a loopback to the host and is often used in troubleshooting and testing network protocols on a system. Also called localhost
“There’s no place like 127.0.0.1”

28
Q

APIPA

A

Automatic Private IP Addresses
Used when a device does not have a static IP address or cannot reach a DHCP server
169.254.x.x

29
Q

Virtual IP Address

A

IP address that does not correlated to an actual physical network interface
Usually used for NAT, fault tolerance, virtualization
Routers often use VIP to provide redundancy in their connectivity options

30
Q

Subinterfaces

A

Virtual interface that is created by dividing up one physical interface into multiple logical interfaces

31
Q

Unicast

A

Data travels from a single source to a single destination

32
Q

Broadcast

A

Data travels from a single source device to ALL devices on a destination network

33
Q

Multicast

A

Data travels from a single source to multiple (but specific) destination devices

34
Q

Static IP Assignment

A

Manually typing in IP address, subnet mask, default gateway, and DNS server
Time consuming, prone to error, impractical on large enterprise networks

35
Q

Dynamic IP Assignment

A

Dynamic allocation of IP addresses

36
Q

DNS

A

Domain Name System
Converts domain names used by a website to the IP address of its server

37
Q

Windows Internet Name Service (WINS)

A

Identifies NetBIOS systems on a TCP/IP network and converts those NetBIOS names to IP addresses

38
Q

Bootstrap Protocol (BOOTP)

A

Dynamically assigns IP addresses and allows a workstation to load a copy of their boot image over the network
Oldest method of dynamic assignment, least used

39
Q

DHCP

A

Dynamic Host Configuration Protocol
Assigns an IP based on an assignable scope or pool of addresses and provides the ability to configure numerous other options within it
IPs leased for a period of time and returns to the pool when lease expires

40
Q

ZeroConfiguration (ZeroConf)

A

Newer technology based on APIPA which provides a lot of the same features and some newer ones
Assign an IPv4 link-local address to the client
Resolve computer names to IP addresses without the need for DNS by using mDNS (multicast domain name service)
Has other names depending on platform- Bonjour (Apple), LLMNR (Windows), SystemD (Linux)

41
Q

What is the formula to calculate created subnets?

A

2ⁿ where n = number of borrowed bits
Example- /25 has 1 borrowed bit, 2¹ = 2 subnets

42
Q

What is the formula to calculate assignable IP addresses in a subnet?

A

2ⁿ-2 where n = number of host bits. Always subtract 2 to account for Network ID (first IP) and Broadcast ID (last IP)
Example- /25 has 7 host bits, 2⁷-2 or 128-2=126 hosts

43
Q

Variable Length Subnet Mask (VLSM)

A

Allows subnets of various sizes to be used and requires a routing protocol that supports it. A subnetting of subnets

44
Q

How many subnets are in a /24 network? How many IPs?

A

1 subnet
256 IPs

45
Q

How many subnets are in a /25 network? How many IPs?

A

2 subnets
128 IPs

46
Q

How many subnets are in a /26 network? How many IPs?

A

4 subnets
64 IPs

47
Q

How many subnets are in a /27 network? How many IPs?

A

8 subnets
32 IPs

48
Q

How many subnets are in a /28 network? How many IPs?

A

16 subnets
16 IPs

49
Q

How many subnets are in a /29 network? How many IPs?

A

32 subnets
8 IPs

50
Q

How many subnets are in a /30 network? How many IPs?

A

64 subnets
4 IPs

Computer Networking (9 decks)

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