Chap 5-Networks

Question 1

Bridge vs Gateway

Answer 1

Bridge connects 2 networks with same protocol.
Gateway connects networks with different protocols.

Question 2

Router’s function?

Answer 2

Routing: Sending to destination
SPF(Shortest path first)
Control Traffic: (Like firewall)

Other built-in function:
Booster, Modem, WAP, Firewall

Question 3

Booster?

Answer 3

Amplify any signal in a network(Even wireless or wired connection,Cable, Telecom)

Question 4

Wireless Access Point ?

Answer 4

Provide/Extend wireless connection to a network.

Question 5

Function of VPN

Answer 5

1.Change/Hide IP address
2.provide private LAN from a remote location
3.Provides an encrypted connection to LAN using the infrastructure of a public network
4.Allow access to geo-blocked content
5.Prevent others from tracking users’ internet activity

Question 6

Filter function?

Answer 6

Prevent access to blocked URLs/sites/keywords (Stop seeing unwanted/inappropriate web content)

Question 7

How distance sensor is used by embedded system in Autonomous (Smart car)

Answer 7

• If an object is close, applies the brakes/Changes direction(By actuator).
  Or sounds an alarm/Displays a warning (Audio/Visual output)

Question 8

What is DHCP?

Answer 8

Dynamic Host Configuration Protocol that is used to assigned Dynamic IP to devices by ISP

Question 9

Pros and Cons of Wired Connection?

Answer 9

Pros
•Higher Bandwidth
•More stable (No signal lost in air)
•More secure(Can’t Intercept: shielded)
•

Cons
•Cannot move around
•Cost of Cables
•Health hazard(Trailing wires)
•Waste time finding/connecting cables

Question 10

Potential results of MAC spoofing?

Answer 10

•Cause conflict in data transmission
•Evade Network Bans/MAC filtering
•Protected Privacy (Can’t track)
•Masquerading as another device(to gain unauthorized access,intercept)

Question 11

How does a router work? Step by step?

Answer 11

-Stores the IP in routing table
-Reads packet header
-Compare recipient’s IP with IP of devices connected to it
-Forward the packet to its destination
-Using most efficient route

Question 12

Securing data on networks?

Answer 12

•Logins and Password
•PIN/Pattern/Password
•Biometric Scanner(Facial/Fingerprint/Iris/Voice recognition)
•Encryption(WEP,WPA)
•Anti malware

•File access right
•Transcation logs(Identify unusual activity and which computers have been accessed)
•Backups
•VPN
•Firewalls(Mostly for organization, individual doesn’t use that much)

Question 13

Why must the use of keywords consider when using search engine?

Answer 13

-Keyword entered is compared against the content of webpages in web server and return most relevant results

Question 14

What affects the search rank/results?

Answer 14

•Cookies which helps showing personalized contents.
•The search algorithm of different search engine.
•The search algorithm at that time.
•Search terms

•Search tool/Search types

Question 15

Why show different results when enters same search terms?

Answer 15

•Different algorithms of different search engine.
•Personalized contents provided based on transactional data.

Question 16

How is MAC/IP use to prevent access to networks?

Answer 16

Every device and packet has own unique MAC/IP and is checked and filtered/blacklisted by firewall

Question 17

Benefits of using LANs

Answer 17

•Access to shared peripherals
•Shared access to the internet
•Media streaming
•Access to shared storage/data
•Communication(Msg and file)
•Flexible Access(Easily Access from any connected device)

Question 18

Benefits of using Client server network

Answer 18

•Centralised Administration
•Centralised Backup
•Control of user access rights
•Roaming Profile
•Shared software
•Shared storage and file access

Question 19

Benefits of Peer to Peer

Question 20

Types of Sever

Answer 20

•Print Server
•File Server
•Authentication server
•Application Server
•Web Server

Question 21

What does Network OS allow?

Answer 21

•Passing usernames and passwords to server for checking when user log in

•Separating user accounts & ensuring users can’t access each other’s files

•Provide access to network storage and resources (networked printers)

Question 22

What’s intranet?

Answer 22

A computer network used for exchanging or seeing information within a company

Question 23

Types of internet connection?

Answer 23

•Mobile Broadband
•Satellites