Chapter 2 Flashcards
What is the difference between internet (small ‘i’) and
Internet (capital ‘I’)?
Internet (small ‘i’) is a group of interconnected computer networks, while Internet
(capital ‘I’) connects networks all over the world.
What is the World Wide Web (Web)?
A subset of Internet computers that are easily accessible to each other and includes
easy-to-use interfaces.
What was the goal of creating a worldwide network in the
early 1960s?
To connect computers and weapons, remain operational even if parts of the network
were destroyed, and avoid the inherent risk of single-channel connection.
What is a Local Area Network (LAN)?
A network of computers located close together.
What is a Wide Area Network (WAN)?
A network of computers connected over greater distances
How do network access providers sell Internet access
rights?
Directly and through Internet service providers (ISPs).
Explain how a telephone call works.
It establishes a single connection path between caller and receiver and transmits data
along that single path.
What is circuit switching?
It is a centrally controlled, single-connection model.
Disadvantage of circuit switching ?
a break in any circuit causes interruption and data loss.
What are packets labelled with in a packet-switched
network?
Origin, sequences, and destination addresses.
What does the destination computer do with the packets in
a packet-switched network?
It collects packets and reassembles the original file or email message.
What is the function of routers in a network?
To forward each packet to its destination
What is the function of hubs, switches, and bridges in a
network?
To move packets from one part of the network to another.
What is a public network?
A network available to the public and lacks basic security measures.
What is a private network?
A leased-line connection between two companies that physically connects their
computers or networks together.
What is a leased line?
A permanent telephone connection between two points, providing security but at a
higher cost.
What is a Virtual Private Network (VPN)?
A connection via public networks to send data in a way that protects it as well as a
private network at a lower cost.
How does a VPN create a private passageway through the
public Internet?
By using IP tunneling (encapsulation) system.
What does encapsulation do in the context of VPN?
It encrypts packet content and places it inside another packet.
Define Intranet
An internet within the boundaries of the organization.
Define extranet
An intranet that extends beyond the organization and incorporates networks of outside
entities.
Define protocol
A collection of rules for data transmission across a network
What is the role of Transmission Control Protocol (TCP) ?
It controls message or file disassembly into packets before Internet transmission and
controls packet reassembly into original formats at destinations.
What is the role of Internet Protocol (IP) in Internet
transmission?
It specifies addressing details for each packet and labels packet with origination and
destination addresses.
e-mail server computer
is devoted to e-mail handling and stores and forwards e-mail messages
e-mail client software
reads and sends e-mail and communicates with e-mail server software
function of a Web server compute
Receives requests from many different Web clients and sends back files.
How does IMAP differ from POP?
It allows users to view email headers before downloading and manage messages
without downloading from the server
