Computer Science Term 1 Exam 20172018 Grade 10

Computer Science Term 1 Exam 2017/2018 Grade 10 Hamdan Bin Zayed School Mrs. Shamma Al Dhaheri 1. Please Study Your Book: Unit Coverage: • Unit 2 Pages (48 -66) • Unit 4 Pages (153 -164) • Unit 5 Pages (182 -190) 2. Review the provided slides. 3. Review the provided example exam. Education is the key to unlock the golden door of freedom 1

Unit 2 Pages (48 -66) Education is the key to unlock the golden door of freedom 2

GSM Cell Phone Network (global system management) Wi-Fi hotspot GSM Cell Data Network Bluetooth Education is the key to unlock the golden door of freedom GPS (global positioning system) NFC Near Field Communication 3

WNIC + RG 45 Cable Both have a Unique MAC Address Media Access Control Education is the key to unlock the golden door of freedom 4

Network IP Configuration require: • IP Address for Host • Subnet mask for network • Default Gateway for Network Device (i. e. router, switch, hub) • It might be done manually by an admin or automatically by the DHCP server. Configuring Network Automatically by Dynamic Host Configuration Protocol DHCP Education is the key to unlock the golden door of freedom 5

Domain Name Server Education is the key to unlock the golden door of freedom 6

Peer to Peer Connection Consists of two directly connected computers using either wires or wireless connection. To exchange information and resources acting as either client or server Advantages Disadvantages • Easy to set up • Less complex • Lower cost because no network devices • For simple tasks • No centralized administration • No security • No scalability (not capable to be enlarged to accommodate changes of network) • All devices might acts as both clients and servers which might slow their performance Education is the key to unlock the golden door of freedom 7

Network infrastructure (platform that support network and make it stable and reliable) Network Media 1 Waves in the air Network Device 2 i. e. Switch, router, hub Network Device 1 End Device: Server Host Network Media 2 Cable, wireless End Device: Clients Host 8

IP Address : Internet Protocol Address • Unique • Provided by ISP (internet service provider) • For every session. • Its either 32 -bit or 128 -bit • Contains four 8 -bit numbers each called octet • Each octet represent a number from 0 -255 • and separated by full stop i. e. 225. 45. 23. 22 • IPv 4: Every number = 8 bits * 4 = 32 • Following the path: • Traceroute: shows a message’s journey from the source to destination through many different networks which called “hops” using trace route utility (tracert) Education is the key to unlock the golden door of freedom 9

Unit 4 Pages (153 -164) Education is the key to unlock the golden door of freedom 10

IPv 4 vs IPv 6 Education is the key to unlock the golden door of freedom 11

Converting IP address from binary to decimal i. e. OCTA 1 Octa Bit Value 128 64 OCTA 2 32 16 8 4 2 1 128 64 OCTA 3 32 16 8 4 2 1 128 64 OCTA 4 32 16 8 4 2 1 128 64 32 16 8 4 2 1 Binary address Binary bit value Add up value IP in decimal Education is the key to unlock the golden door of freedom 12

Public vs Private IP Address Education is the key to unlock the golden door of freedom 13

Private addresses pool Education is the key to unlock the golden door of freedom 14

Public vs Private IP Address Education is the key to unlock the golden door of freedom 15

Public vs Private IP Address Education is the key to unlock the golden door of freedom 16

Public vs Private IP Address/ NAT Education is the key to unlock the golden door of freedom 17

Unit 5 Pages (182 -190) Education is the key to unlock the golden door of freedom 18

Servers are used to provide • Logins and security • File handling • Printing • Internet access Education is the key to unlock the golden door of freedom 19

Domain Name Server Education is the key to unlock the golden door of freedom 20

URL (Uniform Resource Locator) Four parts of URL: 1. HTTP is protocol to request the page ( Hypertext Transfer Protocol) Protocol 1. The domain name 2. Folder on the server 3. The actual requested file Education is the key to unlock the golden door of freedom 21

DNS ( Domain Name Server) Simple View Helpers • After retrieving the records, it will have time to live value in the cache Then it will be automatically deleted because the recursive server will ask for new copy to make sure the info doesn’t out of date. • This process takes milliseconds Education is the key to unlock the golden door of freedom Real Complex View 22