Network And Web Technologies

Question 1

DNS

Answer 1

Domain Name Server
Catalogues domain name of web pages on internet to IP address

Root
Generic/Country TLD
2LD (.co, .gov)
3LD (.bbc, .ebay)

Question 2

URL

Answer 2

Uniform Resource Locator

Address of internet resources

Question 3

IP

Answer 3

Internet Protocol
Unique address assigned to network device
111.222.333.444

Question 4

Wide Area Network

Answer 4

Relies on 3rd party carriers

Spread of large geographical area

Question 5

Local Area Network

Answer 5

Number of devices in small geographical area
Hard wired/wireless
Infrastructure owned by network owner

Question 6

Bus

Answer 6

Single cable + terminators

+
Cheap

-
Cable fail, all down
Collisions
Low security 
Low performance with many devices

Question 7

Star

Answer 7

Central switch and many devices

+
I cable fail = 1 station fail
High transmission speeds
No collisions

-
Costly
Switch fails = whole network down

Question 8

Mesh

Answer 8

Each node connected to each node

+
Self healing
Fast communication

-
Bulk wiring
Complicated

Question 9

Packet Switching

Answer 9

Data packets send to receiver by hopping across routers on most efficient route

Question 10

Data Packets

Answer 10

Header - sender/receiver IP address
Payload
Checksum
Hop limit

Question 11

Router vs Gateway

Answer 11

Connect 2 networks

Same protocol vs diff protocol across 2 networks

Question 12

MAC

Answer 12

Media Access Control address
48 bits, hex
Hard coded into each Network Interface Card

Question 13

Protocols

Answer 13

Rules defining data communication

Question 14

TCP/IP stack

Answer 14

Application - HTTP, FTP, POP
Transport- TCP (into packets, end to end connection)
Network Layer- routers (add IP addresses)
Link Layer- MAC address added

All Tooks Never Lie

Question 15

Firewall

Answer 15

Prevent unauthorised across
Packet filtering
Proxy server

Question 16

Virus

Answer 16

Self replicate

Require host file to be executed

Question 17

Worm

Answer 17

Type of virus

No user intervention

Question 18

Trojan

Answer 18

Not self replicating

Open back door

Question 19

HTML

Answer 19

Describes content and structure of webpage

Head, body, html, title, h1, img, a, ol, ul, li, div

Question 20

CSS

Answer 20

Cascading style sheet

Internal, inline/embedded, external

Question 21

Identifiers vs Class

Answer 21

Unique to each webpage, # vs used multiple times on webpage, .

Question 22

JavaScript

Answer 22

Add behaviours
Interpreted not compiles
In script tags

Question 23

Page Rank Algorithm

Answer 23

PR(A) = (1-d) + d(PR(T1)/C(T1) … PR(Tn)/C(Tn))

Question 24

Client server

Answer 24

+ central location therefore:
Security, updates/backups, share resources

-
Expensive, professional IT staff needed

Question 25

Peer to peer

Answer 25

+
Cheap, easy to maintain

-
Piracy, torrent websites, worse security, harder to backup/update

Question 26

Client Side processing

Answer 26

Initial data validation
Web interactivity
Reduce load on server
Apply css

Question 27

Server side

Answer 27

Faster data processing
Query database
Perform complex calculations
Keep data secure