Session 15

Question 1

IP Address & DNS

Answer 1

every device connected to the internet must have a unique ID

Question 2

General format of IP addresses

Answer 2

four segments of numbers, each ranging fro 0 to 255, binary format.
IP address is required for all internet communication (problem: hard to memorize, non-intutive. Solution DNS (Domain name system).
DNS maps an IP address with a “domain name”- easier to remember

Question 3

Domain name strucutre

Answer 3

”.”-internt root domain
.edu,.com,.gov,.org,.net- Top level domains
Expedia, google, congress- second level domains
sales- third level domains, hosts

Question 4

Internet domain names

Answer 4

Domain names are strictly controlled by ICANN (good name=good asset)
Top Six: edu, com,org, mil, gov, net
country code, .ca, .au, .uk, .ch, .de
New domain names: .name, .biz, .info, .me

Question 5

IPV4 vs IPV6 addresses

Answer 5

Format 32 bits (4 bytes) in binary form, #### each number ranging from 0-255. Contains up to 4 billion addresses.
IPV6 format 128 bits, ranging 0 to 65535

Question 6

Need for IPv6

Answer 6

UW was allocated a class A IP address space which includes 65000 addresses, many more than need. 
stanford has 17 million addresses vs. 2 million for india with more than 1 billion pop.

Question 7

Client Server Computing

Answer 7

Client (web browser, other client softwares) - internal- server- application server (web page, mail files)- database server- back end systems (data bases) sales production accounting HR

Question 8

major web servers

Answer 8

Apacha 66.65%, microsoft, 18%

Question 9

Packet Switching

Answer 9

Messages are first broken down into small bundles of data called packets.
packets are sent along different communication routes
are reassembles once they reach their destination. Packet switching makes more efficient use of a network than circuit switching.

Question 10

Communication protocol: TCP/IP

Answer 10

tcp/IP is the new communication protocol used by the internet and internet devices (it allows communication between different networks, connecting them an “inter-net”
TCP/IP provides for breaking up digital messages into packets, routing them to the proper addresses, and then reassembling them into coherent messages.

Question 11

Transmission Control Protocol (TCP)

Answer 11

handles the movement of data between computers, establishes a connection between computers, sequence the transfer of packets, and packets are secure.

Question 12

Internet protocol (IP)

Answer 12

responsible for the delivery of packets, includes the disassembling and reassembling of packets during transmission.