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Question 1

what is internet and what is the Internet

Answer 1

An internet is a network of computers that are able to exchange information using Internet Protocols. The Internet is the most commonly used internet and in reality most people are not aware that there are other internets. The size of the Internet dwarfs the size of all other internets combined. One of the better know internets, aside from the Internet itself, is Internet2, seeInternet2 - Wikipedia for more information about it.

Question 2

list layers in ISO 7-layer model

Answer 2

Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical

Question 3

The TCP/IP stack

Answer 3

IP, ICMP, TCP, UDP, DNS, XDR, NFS and SMTP

Question 4

Various link levels

Answer 4

SLIP, 802.5 and Ethernet, satellites, the “fat pipe”, ATM. versus carrying. Security and firewalls

Question 5

Performance issues of networks

Answer 5

bandwidth, MSS and RTT; caching at various layers.

Question 6

Who ’owns’ the Internet and who ’manages’ it

Answer 6

RFCs, service Providers, domain managers, IANA, Jisc/UKERNA, MANs, commercial British activities. Routing protocols and default routers. HTML and Electronic publishing.