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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?

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
What is the IP range for a Private Class C Network?
192.168.x.x
26
How many possible hosts can a Private Class C Network have?
65,536
27
Loopback Address
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
APIPA
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
Virtual IP Address
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
Subinterfaces
Virtual interface that is created by dividing up one physical interface into multiple logical interfaces
31
Unicast
Data travels from a single source to a single destination
32
Broadcast
Data travels from a single source device to ALL devices on a destination network
33
Multicast
Data travels from a single source to multiple (but specific) destination devices
34
Static IP Assignment
Manually typing in IP address, subnet mask, default gateway, and DNS server Time consuming, prone to error, impractical on large enterprise networks
35
Dynamic IP Assignment
Dynamic allocation of IP addresses
36
DNS
Domain Name System Converts domain names used by a website to the IP address of its server
37
Windows Internet Name Service (WINS)
Identifies NetBIOS systems on a TCP/IP network and converts those NetBIOS names to IP addresses
38
Bootstrap Protocol (BOOTP)
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
DHCP
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
ZeroConfiguration (ZeroConf)
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
What is the formula to calculate created subnets?
2ⁿ where n = number of borrowed bits Example- /25 has 1 borrowed bit, 2¹ = 2 subnets
42
What is the formula to calculate assignable IP addresses in a subnet?
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
Variable Length Subnet Mask (VLSM)
Allows subnets of various sizes to be used and requires a routing protocol that supports it. A subnetting of subnets
44
How many subnets are in a /24 network? How many IPs?
1 subnet 256 IPs
45
How many subnets are in a /25 network? How many IPs?
2 subnets 128 IPs
46
How many subnets are in a /26 network? How many IPs?
4 subnets 64 IPs
47
How many subnets are in a /27 network? How many IPs?
8 subnets 32 IPs
48
How many subnets are in a /28 network? How many IPs?
16 subnets 16 IPs
49
How many subnets are in a /29 network? How many IPs?
32 subnets 8 IPs
50
How many subnets are in a /30 network? How many IPs?
64 subnets 4 IPs

Computer Networking (9 decks)

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