Ch.12.4: Helpdesk: Transmission Media and Network Adaptors_sc

Wired Transmission Media: Coaxial 3

4. An external jacket of lightweight plastic covers the internal cable components to protect them from damage.

The system that data takes to flow between devices on a network is called _________.

transmission media

data packet

A piece of data sent over a network. Messages have to be broken down into binary data packets before they are transferred.

MAC Addresses p2

Because all MAC addresses must be unique, there is an Institute of Electrical and Electronics Engineers committee responsible for allocating blocks of numbers to network adapter manufacturers.

Network adapters

Devices contained within computing devices that perform specific tasks to enable nodes to communicate on a network.

Network Adapters

Network adapters are devices that perform specific tasks to enable nodes to communicate on a network. Network adapters are installed inside computers and peripherals. These adapters are referred to as network interface cards NICs). NICs may feature wired, wireless, or both types of connectivity.

IP Addresses

is an identifier assigned to each computer and other device e.g., printer, router, mobile device, etc.) connected to a TCP/IP network 1] that is used to locate and identify the node in communications with other nodes on the network

Network adapters perform three critical functions: 3

They act as gatekeepers for information flowing to and from the client computer. Much like a security guard in a gated community, a network adapter is responsible for permitting or denying access to the client computer (the community) and controlling the flow of data (visitors).

Wired Transmission Media: Fiber Optic 2

2. A protective layer of glass or plastic cladding is wrapped around the core to protect it. 3. For additional protection, it has an outer jacket (sheath), which is often made of a durable material such as Kevlar (the substance used to make bulletproof vests).

Wired Transmission Media: Coaxial 2

2. A solid layer of nonconductive insulating material (usually a hard, thick plastic) surrounds the core. 3. A layer of braided metal shielding covers the insulation to reduce interference with signals traveling in the core.

MAC Addresses vs. IP Addresses. are not the same thing.

A MAC address is used for identification purposes internally on a network. An IP address is the address external entities use to communicate with your network.

fiber-optic cable

A cable that transmits data at close to the speed of light along glass or plastic fibers. Transmits data via light waves. Virtually immune to interference but very costly to purchase and install.

network adapter

A device that enables the computer (or peripheral) to communicate with the network using a common data communication language, or protocol.

Network Adapters

A device that enables the computer or peripheral) to communicate with the network using a common data communication language, or protocol. enable nodes in a network to communicate with each other

Wired Transmission Media: Coaxial

Although more expensive than twisted-pair, coaxial cable is still used in some manufacturing facilities where machinery creates heavy electrical interference. Coaxial cable consists of four main components: 1. A core (usually copper) is in the very center and is used for transmitting the signal.

Wired Transmission Media 3

Because of its low price, twisted-pair cable is used in business networks unless significant sources of interference must be overcome, such as in a production environment where machines create magnetic fields.

Twisted-pair cable

Consists of pairs of copper wires twisted around each other and covered by a protective sheath jacket).

Network adapters perform three critical functions: 1 They generate higher-powered signals to enable data to traverse the network.

Digital signals generated inside the computer are fairly low powered and would not travel well on cable or wireless network media without network adapters. Network adapters convert the signals from inside the computer into higher-powered signals that have no trouble traversing the network media.

MAC Addresses

Each network adapter has a physical address called a media access control MAC) address. MAC addresses are made up of 6 two-position characters, such as 01:40:87:44:79:A5.

What type of network media is virtually immune to interference?

Fiber-optic cable

Wired Transmission Media: Fiber Optic 3

Fiber-optic cable is virtually immune to interference, but it is the most expensive type of cable and requires special expertise to install.

Wired Transmission Media: Fiber Optic

Fiber-optic cable transmits signals with pulses of light and is composed of the following: 1. A glass (or plastic) fiber (or a bundle of fibers called a core) through which the data is transmitted.

Transmission media:

For wired or wireless communications technology, the system that data takes to flow between devices on the network.

A key component for data navigation on an internal network is a(n) _________.

MAC address

Wireless access point (WAP

Network device that provides wireless devices a sending and receiving connection point to a network.

transmission media

The radio waves or cable that transport data on a network.

Network adapters perform three critical functions: 2

They're responsible for breaking the data into packets and for transmitting and receiving data. They're also responsible for receiving incoming data packets and, in accordance with networking protocols, reconstructing them, as shown in this figure.

Wired Transmission Media

Transmission media, whether for wired or wireless communications technology, make up the system that data takes to flow between devices on the network. Various kinds of transmission are media available.

Wired Transmission Media 2

Twisted-pair cable consists of pairs of copper wires twisted around each other and covered by a protective sheath or jacket. The twists are important because they cause the magnetic fields that form around the copper wires to intermingle, making them less susceptible to outside interference.

MAC address -Media Access Control)

Unique address embedded in network connected devices. A key component for data navigation on an internal network

Media access control MAC) address:

Unique physical address on a network adapter that is used for internal network data navigation.

Wireless Access Point (WAP)

enables devices to connect to a wireless network to communicate with each other

coaxial cable

insulated copper wire; used to carry high-speed data traffic and television signals Shielded cable with a solid core that is more resistant to interference than twisted-pair cable.

The device that breaks data into packets for transmission on a network is the _________.

network adapter

TCP/IP network

the conceptual model and set of communications protocols used on the Internet and similar computer networks. It is commonly known as TCP/IP because the original protocols in the suite are the Transmission Control Protocol TCP) and the Internet Protocol IP).

The most cost effective wired media is ____________.

twisted-pair cable