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CCNA > IPv4 Adressing > Flashcards

IPv4 Adressing Flashcards

1
Q

Automatic Private IP Addressing (APIPA)

A

A feature that allows clients to self-configure an IPv4 address and subnet mask when a DHCP server is not available. These addresses are not routable on a local network, and typically indicate a problem with host communication.

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2
Q

Binary

A

A binary number is expressed in a base-2 numerical system, represented by zero (0) values and one (1) values.

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3
Q

Block Size

A

The increment that we count by in the interesting octet to determine usable IPv4 address ranges. The formula is Block Size = 256 - Interesting Octet Value

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4
Q

Class A Address

A

In classful network addressing, a Class A address has a value in the first octet ranging from 1 - 126, with a default subnet mask value of 255.0.0.0 (or /8 in prefix notation).

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5
Q

Class B Address

A

In classful network addressing, a Class B address has a value in the first octet ranging from 128 - 191, with a default subnet mask value of 255.255.0.0 (or /16 in prefix notation).

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6
Q

Class C Address

A

In classful network addressing, a Class C address has a value in the first octet ranging from 192 - 223, with a default subnet mask value of 255.255.255.0 (or /24 in prefix notation).

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7
Q

Class D Address

A

Used for multicast purposes, with a value in the first octet ranging from 224 - 239. Because these addresses are never assigned to specific hosts, this address class does not use a subnet mask.

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8
Q

Class E Address

A

Reserved for research purposes and potential future deployment, these addresses have a value in the first octet ranging from 240 - 255.

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9
Q

Classless Interdomain Routing (CIDR)

A

Creating a network address by subtracting bits from the natural subnet mask value. Also referred to as prefix notation or slash notation.

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10
Q

DHCP Relay

A

A host used to forward requests and replies between DHCP clients and servers when they do not reside on the same subnet.

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11
Q

Directed Broadcast Address

A

The last address in a subnet, used for communicating with all of the IP addresses within the subnet.

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12
Q

Domain Name System (DNS)

A

Translates human-readable domain names such as kwtrain.com into a computer-readable IP address.

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13
Q

Dotted Decimal Notation

A

A format for expressing 32-bit IPv4 addresses using four octets separated by decimals.

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14
Q

Dynamic Host Configuration Protocol (DHCP)

A

A protocol used to automatically provide clients within a network an IP address, subnet mask, default gateway, and DNS server information.

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15
Q

Host Bits

A

The portion of an IPv4 address represented by a series of contiguous binary 0 values in a 32-bit subnet mask.

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16
Q

Interesting Octet

A

The last octet in the subnet mask to contain a binary 1 value.

17
Q

IPv4 Broadcast

A

IPv4 Broadcast
A one-to-all type of IPv4 communication where one source IP address sends information to every other destination IP address on the local subnet.

18
Q

IPv4 Multicast

A

A one-to-many type of IPv4 communication where one source IP addresses sends information to one or more destination IP addresses which are specifically listening for the messages. Traffic is sent to a Class D multicast group address, to which clients can join and receive data.

19
Q

IPv4 Unicast

A

A one-to-one type of IPv4 communication where one source IP address sends information to one destination IP address.

20
Q

Loopback Address

A

An address used to test the communication and transportation medium locally. Data packets sent to a loopback address are re-routed back to the original node without any alteration. In IPv4, the address 127.0.0.1 is designated as the loopback address.

21
Q

Network Address

A

The first address in a subnet, used for identifying the network segment.

22
Q

Network Bits

A

The portion of an IPv4 address represented by a series of contiguous binary 1 values in a 32-bit subnet mask.

23
Q

Octet

A

A grouping of 8 binary values (or bits) in an IPv4 address, separated by a decimal. Each IPv4 address contains 4 different octets, for a total of 32 bits.

24
Q

Prefix Notation

A

A method for notating a subnet mask value in which the number represents how many contiguous binary 1 values are in a 32-bit subnet mask. For example, /8 means there are 8 contiguous binary 1 values, leaving 24 contiguous binary 0 values to complete the 32-bit number. This is also referred to as slash notation.

25
Q

Private Class A Address

A

IPv4 addresses that fall within the range of 10.0.0.0 - 10.255.255.255, with a default subnet mask value of 255.0.0.0 (or /8 in prefix notation).

26
Q

Private Class B Address

A

IPv4 addresses that fall within the range of 172.16.0.0 - 172.31.255.255, with a default subnet mask value of 255.255.0.0 (or /16 in prefix notation).

27
Q

Private Class C Address

A

IPv4 addresses that fall within the range of 192.168.0.0 - 192.168.255.255, with a default subnet mask value of 255.255.255.0 (or /24 in prefix notation).

28
Q

Private IPv4 Address

A

An address reserved for internal use on a local network, which is not routable over the public Internet.

29
Q

Public IPv4 Address

A

A globally unique address that can be assigned to a device and accessed over the public Internet.

30
Q

Subnet Mask

A

A 32-bit number consisting of a series of contiguous binary 1 values followed by a series of contiguous binary 0 values. This is used to delineate the network and host portions of an IPv4 address.

31
Q

DNS Record Type for IPv4

A

Address Mapping record (A Record)—also known as a DNS host record, stores a hostname and its corresponding IPv4 address.

32
Q

Automatic Private IP Addressing (APIPA) Address Ranges

A

APIPA addresses fall within the range of 169.254.0.0 - 169.254.255.255, with a default subnet mask value of 255.255.0.0 (or /16 in prefix notation).

CCNA (17 decks)

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