Topic 3 Networks

Question 1

Definition: Network

Answer 1

A computer network is a group of computer systems and other computing hardware devices that are linked together through communication channels to facilitate
communication and resource-sharing among a range of users.

Question 2

real name : LAN

Answer 2

Local Area Network

Question 3

function: LAN

Answer 3

LAN stands for local area network. It covers, as the name
suggests, a local area.

• This usually includes a local office/building and they’re also pretty common in homes now, thanks to the spread of Wi-Fi.
• Whether wired or wireless, nearly all modern LANs are based on Ethernet, a set of protocols for exchanging data.
• There are two ways to implement Ethernet: twisted-pair
  cables (UTP) or wireless (Wi-Fi radio waves).

Question 4

real name: WAN

Answer 4

Wide Area Network

Question 5

function: WAN

Answer 5

The name is exactly what it sounds like: a network that covers an area wider than a LAN.

• Beyond that, the definition is less clear. Distances can range from a network connecting multiple buildings on a corporate or college campus to satellite links connecting offices in different countries.
• The most popular WAN is the internet.
• It’s actually a collection of other networks, including other LANs and WANs – hence, the name.
• WANs can be wired (using fibre-optic cable) or wireless
  (using microwave or satellite transmission technology).

Question 6

real name: VLAN

Answer 6

Virtual Local Area Network

Question 7

funtion: VLAN

Answer 7

A virtual local area network (VLAN) is a logical group of workstations, servers and network devices that appear to be on the same LAN despite their geographical distribution.

• A VLAN allows a network of computers and users to communicate in a simulated environment as if they exist in a single LAN.
• VLANs are implemented to achieve scalability, security and ease of network management and can quickly adapt
  to changes in network requirements and relocation of workstations and server nodes.

Question 8

real name: SAN

Answer 8

Storage Area Network

Question 9

funtion: SAN

Answer 9

• A storage area network (SAN) is a secure high-speed data transfer network that provides access to consolidated blocklevel storage.
• An SAN makes a network of storage devices accessible to multiple servers.
• SAN devices appear to servers as attached drives, eliminating traditional network bottlenecks.
• SANs are sometimes also referred to (albeit redundantly) as SAN storage, SAN network, network SAN, etc.

Question 10

real name: WLAN

Answer 10

Wireless Local Area Network

Question 11

function: WLAN

Answer 11

A wireless local area network (WLAN) is a wireless distribution method for two or more devices that use highfrequency radio waves and often include an access point to
the Internet.

• A WLAN allows users to move around the coverage area, often a home or small office, while maintaining a network connection.
• A WLAN is sometimes called a Wi-Fi network, but can
  include other transmission technologies

Question 12

real name: Internet

Answer 12

network of networks

Question 13

function: Internet

Answer 13

The internet is a globally connected network system that uses the TCP/IP protocols to transmit data via various types of media.

• The internet is a network of global exchanges – including private, public, business, academic and government networks – connected by wired, wireless and fibre-optic technologies.
• The terms internet and World Wide Web are often used interchangeably, but they are not exactly the same thing; the internet refers to the global communication system, including hardware and infrastructure, while the web is one of the services
  communicated over the internet.