Chapter 1 Flashcards
What is a host?
End systems
What are some communication links?
fiber, copper,
radio, satellite
What is bandwidth?
transmission rate
What are Packet switches?
forward packets (chunks of data) - routers and switches
What is the internet?
Network of networks
What is a protocol? examples?
Rules on how messages are sent and received.
- e.g., TCP, IP, HTTP, Skype,
What are some internet standards?
RFC: Request for comments
IETF: Internet Engineering Task Force
What kinds of services does the internet provide?
Infrastructure that provides services to applications:
- Web, VoIP, email, games, e-commerce, social nets, …
Provides programming interface to apps:
- hooks that allow sending and receiving app programs to “connect” to Internet
- provides service options eg. postal service
What is a network protocol?
Protocols define format, order of msgs sent and received among network entities, and actions taken on msg transmission, receipt
What is the network edge?
- hosts: clients and servers
- servers often in data centers
What is the access networks, physical layer?
- wired or wireless communication links
What is the Network Core?
- interconnected routers
- network of networks
How to connect end systems to edge router?
- residential access nets
- institutional access networks (school, company)
- mobile access networks
What is DSL?
- data over DSL phone line goes to Internet
- voice over DSL phone line goes to telephone net
What is the cable network?
Frequency division multiplexing: different channels
transmitted in different frequency bands
