Exam 1

A ________ is a set of rules that governs data communication. A) protocol B) forum C) standard D) none of the above

A

Which topology requires a multipoint connection? A) Bus B) Star C) Mesh D) Ring

A

Which organization has authority over interstate and international commerce in the communications field? A) FCC B) IEEE C) ITU-T D) ISOC

A) FCC

A _______ is a data communication system within a building, plant, or campus, or between nearby buildings. A) LAN B) MAN C) WAN D) none of the above

A) LAN

An unauthorized user is a network _______ issue. A) Security B) Reliability C) Performance D) All the above

A) Security

________ refers to the physical or logical arrangement of a network. A) Topology B) Mode of operation C) Data flow D) None of the above

A) Topology

In a _______ connection, more than two devices can share a single link. A) multipoint B) point-to-point C) primary D) secondary

A) multipoint

Communication between a computer and a keyboard involves ______________ transmission. A) simplex B) half-duplex C) full-duplex D) automatic

A) simplex

________ is a collection of many separate networks. A) A WAN B) An internet C) A LAN D) None of the above

B) An internet

________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation. A) Syntax B) Semantics C) Timing D) None of the above

B) Semantics

_______ refers to the structure or format of the data, meaning the order in which they are presented. A) Semantics B) Syntax C) Timing D) All of the above

B) Syntax

_______ refers to two characteristics: when data should be sent and how fast it can be sent. A) Semantics B) Timing C) Syntax D) none of the above

B) Timing

A ______ is a data communication system spanning states, countries, or the whole world. A) MAN B) WAN C) LAN D) none of the above

B) WAN

In a ________ connection, three or more devices share a link. A) point-to-point B) multipoint C) (a) and (b) D) none of the above

B) multipoint

In a ______ connection, two and only two devices are connected by a dedicated link. A) multipoint B) point-to-point C) (a) and (b) D) none of the above

B) point-to-point

A television broadcast is an example of _______ transmission. A) half-duplex B) simplex C) full-duplex D) automatic

B) simplex

This was the first network. A) CSNET B) NSFNET C) ARPANET D) ANSNET

C) ARPANET

_______ are special-interest groups that quickly test, evaluate, and standardize new technologies. A) Standards organizations B) Regulatory agencies C) Forums D) All of the above

C) Forums

The _______ is the physical path over which a message travels. A) Protocol B) Signal C) Medium D) All the above

C) Medium

The information to be communicated in a data communications system is the _______. A) Medium B) Protocol C) Message D) Transmission

C) Message

________ is an idea or concept that is a precursor to an Internet standard. A) RCF B) ID C) RFC D) none of the above

C) RFC

Frequency of failure and network recovery time after a failure are measures of the _______of a network. A) Performance B) Security C) Reliability D) Feasibility

C) Reliability

Which topology requires a central controller or hub? A) Mesh B) Bus C) Star D) Ring

C) Star

_______ is the protocol suite for the current Internet. A) UNIX B) NCP C) TCP/IP D) ACM

C) TCP/IP

In _______ transmission, the channel capacity is shared by both communicating devices at all times. A) simplex B) half-duplex C) full-duplex D) half-simplex

C) full-duplex

A _______ connection provides a dedicated link between two devices. A) primary B) multipoint C) point-to-point D) secondary

C) point-to-point

Which agency developed standards for physical connection interfaces and electronic signaling specifications? A) ISO B) ITU-T C) ANSI D) EIA

D) EIA

In the original ARPANET, _______ were directly connected together. A) routers B) host computers C) networks D) IMPs

D) IMPs

Data flow between two devices can occur in a _______ way. A) simplex B) half-duplex C) full-duplex D) all of the above

D) all of the above

Devices may be arranged in a _____ topology. A) mesh B) ring C) bus D) all of the above

D) all of the above

Router

Devices used to switching packets: forward packets (chuncks of data) routers and switches

Network edge:

Hosts: clients and servers Servers often in data centers

What's the Internet?

Internet are millions of connected computing devices. Hosts=end systems PC, Server, Wireless laptop, smartphone.

Internet Standards

RFC: request for comments IETF: Internet Engineering task force

Infrastructure that provides services to applications:

Web, VoIP, email, games, e-commerce, Social nets

Protocols

controls sending and receiving messages. ex: TCP, IP, HTTP, Skype, 802.11

There are ___________ internet service providers: a) regional b) local c) national and international d) all of the above

d) all of the above

Communication links: wireless links

fiber, copper, radio, satellite -transmission rate: bandwidth Wireless links

Provides programming interface to apps

hooks that allow sending and receiving app programs to "connect" to internet. provides service options, analogous to postal service.

network core

interconnected routers network of networks

Protocol

it is the format, order of msgs sent and received among network entities, and actions taken on msg transmission, for human protocols usuals starts with a question and the network protocols are machines rather than humans.

Access networks, physical media

wired wireless communication links