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BITS 2513 – INTERNET TECHNOLOGY LECTURE 3: INTERNET INFRASTRUCTURE
TOPICS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Using a Telephone Line to Connect to Internet
Using a Telephone Line to Connect  to the Internet ,[object Object],[object Object],[object Object],[object Object],[object Object]
Using a Cable Modem, ISDN, DSL or Satellite to Connect to the Internet
Modems: An Introduction ,[object Object],[object Object],[object Object]
Modems: An Introduction (Continued) ,[object Object]
Installing a Modem and Its Drivers ,[object Object],[object Object],[object Object],[object Object]
Installing a Modem and Its Drivers –  External Modem  (Continued) ,[object Object],[object Object],[object Object]
Installing a Modem and Its Drivers  Internal Modem  (Continued) ,[object Object],[object Object]
Creating a Dial-Up Connection ,[object Object],[object Object]
Configuring TCP/IP ,[object Object],[object Object]
The Role of TCP/IP  in a Dial-Up Connection ,[object Object],[object Object],[object Object],[object Object],[object Object]
PPP and Multilink PPP ,[object Object],[object Object],[object Object],[object Object]
Connection to the Internet via Cable, ISDN, DSL, or Satellite ,[object Object],[object Object],[object Object],[object Object]
Connection Using -  Cable Modems ,[object Object],[object Object]
Connection Using - Integrated Services Digital Network (ISDN) and DSL ,[object Object],[object Object],[object Object],[object Object]
Connecting to the Internet by Satellite ,[object Object],[object Object],[object Object]
Connecting a PC on a LAN to the Internet
Connecting a LAN to the Internet
Connecting the Gateway to the Internet
Connecting the Gateway to the Internet (Continued ) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Physically and Logically Dividing a Large Network
Physically and Logically Dividing a Large Network ,[object Object],[object Object],[object Object],[object Object]
Bridges and Switches ,[object Object],[object Object],[object Object]
Bridges and Switches  (Continued) ,[object Object],[object Object],[object Object],[object Object]
Bridges and Switches  (Continued) ,[object Object],[object Object],[object Object]
Subnetting ,[object Object],[object Object]
Subnet Masks ,[object Object],[object Object],[object Object],[object Object]
Subnet Masks  (Continued) ,[object Object]
Subnet Masks  (Continued) ,[object Object],[object Object],[object Object]
Selecting a Subnet Mask ,[object Object],[object Object],[object Object]
Routing on the Internet
How Data Travels Across  Interconnected Networks ,[object Object],[object Object],[object Object]
How Data Travels Across Interconnected Networks  (Continued)
Routers ,[object Object],[object Object],[object Object]
Routers  (Continued) ,[object Object],[object Object]
Routers  (Continued) ,[object Object],[object Object]
TCP/IP Routing ,[object Object],[object Object],[object Object]
TCP/IP Routing  (Continued) ,[object Object],[object Object]
Routing Across Many Networks ,[object Object],[object Object]
Default Gateways ,[object Object],[object Object]
Default Gateways  (Continued)
Default Gateways  (Continued) ,[object Object],[object Object]

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Lecture 3 -_internet_infrastructure_updated_2011

Notes de l'éditeur

  1. When we are dialing to the Internet, we are using the PPP connection – between our PC and the IP we dial. PPP is also used over Internet access connections (now marketed as "broadband"). Most Internet service providers (ISPs) used PPP for customer dial-up access to the Internet (source: Wikipedia). This includes Streamyx, one of the most popular Internet service in Malaysia. Usually, Multilink PPP is used so that the bandwidth of the connection will double. Example: Two PPP Connections are combined as if they were a single connection.
  2. In Malaysia, MegaTV was one of the earliest company to offer cable TV in 1995. However, customers prefer ASTRO than MegaTV. Finally. MegaTV defunt in 2001 http://en.wikipedia.org/wiki/Mega_TV_(Malaysia)
  3. A gateway is a node (a router) on a TCP/IP network that serves as an access point to another network
  4. Remember the differences between Hubs and Switches? On which OSI layer they reside? How do they operate? Routing Table is a data table stored in a router or a networked computer that lists the routes to particular network destinations, and in some cases, metrics (distances) associated with those routes. The routing table contains information about the topology of the network immediately around it.
  5. [User Hub A]----[Server]-----------[Server]---[User Hub B] [User Hub A]----[Server]--- [Bridge] ---[Server]---[User Hub B] Bridge/ Switch prevent broadcasts from User Hub A/B to User Hub B/A
  6. Since each router is required to subtract at least one count from the TTL field, the count is usually used to mean the number of router hops the packet is allowed before it must be discarded. Each router that receives a packet subtracts one from the count in the TTL field. When the count reaches zero, the router detecting it discards the packet and sends an Internet Control Message Protocol (ICMP) message back to the originating host.
  7. PC B wants to send a message to PC F PC F’s IP address is 130.5.6.2 But PC B detects that 130.5.6.2 is not in the same subnet as he is. Therefore, PC A forwards the packet to the Default Gateway (PC E), hoping the DG knows where to forward the message.