network tech 4

MAC (Media Access Control) address

refers to the unique physical address of all computers, which are assigned by the manufacturer of the network interface card

Organizational Unique Identifier (OUI)

This is the first 24 bits of the MAC address that is vendor-specific; it identifies the company that manufactured or sold the device

Vendor-Assigned

This is the remaining 24 bits of the MAC address that is incrementally and uniquely assigned by the specific vendor of the hardware–denotes the serial number of the individual device.

IP address

refers to an address that is usually assigned by the network administrator or internet service provider in order to uniquely and universally identify each device on an IP network

public IP address

is what computers use to find each other online and exchange information. It is assigned to the computer by the Internet Service Provider as soon as the computer is connected to the Internet gateway.

Static public IP address

– It is a fixed IP address and is used primarily for hosting web pages or services on the Internet.

Dynamic public IP address

It is chosen from a pool of available addresses and changes each time one connects to the Internet

private IP address

is what computers on a network use to communicate with the router. It can change each time they are connected.

network ID/field

identifies the host that is located on the same physical network

host ID

(also known as a host address) identifies the individual host (e.g., workstation, server, router, or other TCP/IP host) within a network.

Class A address

This uses only the first octet (8 bits) of the 32-bit number to indicate the network address.

Class B address

This uses two (2) of the four (4) octets (16 bits) to indicate the network address

Class C address

– This uses the first three octets (24 bits) of the IP address to identify the network portion, with the remaining octet reserved for the host portion, which is equivalent to eight (8) bits.

Class D address

This is created to enable multicasting using an IP address. A multicast address is a unique address that directs packets with that destination address to predefined groups of hosts

Class E address

This is reserved by the Internet Engineering Task Force (IETF) for its own research.

Diagnostic (Loopback/Localhost Address)

It is used for testing and debugging of programs, hardware, protocol, and connections. (SYN-ACK)

Default Network

it is used for routing internet datagram (TCP).

Network Broadcast

It is used for broadcasting messages to the entire network

Private-use of Internet Space

It is the preconfigured default IP addresses for network devices to extend IPv4 spaces (Home, Commercial, Enterprise)

Link-Local Addresses

If DHCP is not present, these IP addresses will be selected and configured by the network device.

subnet mask (default mask)

determines which portion of an IP address identifies the network and which portion identifies the host.

Default Gateway

is used to specify the address of the nearest routing device that is used by the host device to forward addressed packets onto the network.

Subnetting

It refers to a process of borrowing bits from the host ID field to form a new subnet ID field.

Internet Protocol version 6 (IPv6)

is a set of specifications designed by the IETF, which is an upgraded version of IPv4. The other term for this is IP Next Generation (IPng).

Unicast address

identifies an interface. A packet destined for a unicast address is sent to the interface having that unicast address.

Multicast address

identifies multiple interfaces. A packet destined for a multicast address is sent to all the interfaces joining in the corresponding multicast group.

Anycast address

identifies a group of network interfaces (usually on different nodes).