Exam 6: Communications, Networks, and Cyberthreats: the Wired and Wireless World

Almost all viruses are attached to an _________ file.

The ________ a transmission medium's bandwidth,the more frequencies it can use to transmit data and the faster it is.

One wired communications standard that allows users to send data over a home's existing electrical (AC)power lines is called HomePlug technology; it uses existing electrical lines.

The smaller the bandwidth of a medium,the more frequencies it can use to transmit data.

In a bus network,all computers and communications devices are connected in a continuous loop.

Which of these types of wireless transmission is limited to line-of-sight communications?

Communications satellites are microwave relay stations in orbit around the earth.

________ software can be used to scan a computer's hard disk,CDs,and main memory to detect viruses.

The Internet uses the ________ network topology.

In small LANs,messages may bump into one another.The most popular protocol,or technology,which uses cabling and special ports on microcomputers,that prevents collisions is ________.It can be used with almost any kind of computer and with different network topologies.

The radio-frequency (RF)spectrum is part of the electromagnetic spectrum of radiation; it carries most communications signals.

In an organization,all computer networks are connected to the Internet by a "main highway" called a ________.

A Trojan horse pretends to be a useful program,such as a game or a screen saver,but it carries a virus that replicates in your computer over and over until your computer crashes.

Distinguish between narrowband and broadband.

Traditional landline telephone systems use twisted-pair wire as their communications medium.

Malware consists of safeguards for protecting information technology against unauthorized access,system failures,and disaster that can result in damage or loss.

________ are physical devices that join multiple wired and / or wireless networks; their primary job is to provide connectivity,and they are often used in small office networks,cafés,airports,hotels,and home networks.

Which of these is NOT a type of malware?

Wired communications media include three main types.Insulated copper wire wrapped in a solid or braided shield and then an external cover is called ________ cable.

Wired communications media include three main types.The kind used for tradition telephone lines is a ________.