Network

Question 1

Define Network

Answer 1

Set of computers or computer systems that are interconnected and share resources and data

Question 2

Define Node

Answer 2

Device on network

Question 3

Define Server

Answer 3

Computer system or software package that provides service to other devices in network, e.g. ability to file share. Fulfils requests from client programs or computers

Question 4

Define Client

Answer 4

Device that requests service from server in the same network, e.g. email software client requesting email server software to fetch new emails

Question 5

Define Hub

Answer 5

Connection point for all devices on network, devices connected through Ethernet cables. Data from device goes to the hub, then sent to all devices. Target device receives, others ignore

Question 6

Define Switch

Answer 6

Connection point but can identify which device is connected to which port, so can send data to target device

Question 7

Define Router

Answer 7

Device that connects network to another e.g. home network to internet.

Question 8

Types of Networks (7) (LVWWSPP)

Answer 8

• Local Area Network (LAN)
• Virtual Local Area Network
• Wireless Local Area Network (VLAN)
• Wide Area Network (WAN)
• Storage Area Network (SAN)
• Personal Area Network (PAN)
• Peer-to-Peer Network (P2P)

Question 9

What is a Local Area Network (LAN)?

Answer 9

A network inside one organization or one building
traditionally made of wires and hubs connecting servers and clients. Typically
in a business, connecting employee’s PCs to the company’s servers.

Question 10

What is a Virtual Local Area Network (VLAN)?

Answer 10

It seems to be a LAN, and is all controlled by one organisation.
Commonly PART of a LAN, isolated with no connection to other parts of the
actual physical LAN. Makes sense for security purposes, isolating sensitive
resources

Question 11

What is a Wireless Local Area Network (WLAN)?

Answer 11

Also called WIFI ­ a WIRELESS LAN, using mostly radio connections to
“access point” hubs, with wires connecting the hubs to the servers. Rarely
provides direct wireless connections between clients and servers, as cables
(wires) are much faster.

Question 12

What is a Wide Area Network (WAN)?

Answer 12

A network that spans many computers in widely separate locations, e.g.
separate cities for example, linking bank offices and ATMs. WANS usually
include connections that are public, e.g. not owned by the company.

Question 13

What is a Storage Area Network?

Answer 13

A network containing large amounts of storage (HDD). Usually
virtualized so users don’t need to worry about the actual machines containing
the storage devices ­ commonly “data centers”

Question 14

What is a Personal Area Network?

Answer 14

­Personal Area Network ­ used to connect devices belonging to one user,
or maybe a family. Typically running through wireless router in a home.

Question 15

What is a Peer-to-Peer network?

Answer 15

­Peer to Peer ­communicates between “equal” clients, without using
servers. Commonly used in the Internet to exchange files directly between client
PCs.

Question 16

Define internet?

Answer 16

A WAN. Connect to it through internet service provider (ISP) for monthly fee. Not owned by single entity, no central server. All computer systems are independent to share resources. Internet provides services such as support for email, file transfer, and the WWW, which consists of webpages

Question 17

Define extranet?

Answer 17

External extension to a LAN- Part of a network that uses internet protocols to allow controlled access by specific users to LAN or WAN. e.g. business wants to share some data/ information with clients or partners but not all, so extends part of network (extranet) available for access but with security/ privacy measures (e.g. firewall) so outsiders cannot access secure data

Question 18

What is a VPN?

Answer 18

Virtual Private Network ­ provides secure, private connections between
clients and servers, running across public connections like phone line ­ typically
running across the Internet
Security issues (encryption) are very important here.

Question 19

What is ASCI

Answer 19

Then ASCII was invented in the early
1960’s, making it possible to exchange data and information easily. Original
ASCII was 7­bits plus a parity bit (128 codes). Later this expanded to 8­bits
(without a parity bit) to provide 256 codes.