BCIS / CH. 6

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A computer ______ is a collection of computers that communicate with one another over transmission lines.

network

A(n) _____ connects computers at different geographic locations.

WAN

Which of the following is the distinguishing feature of LAN?

single location

A _____ is a set of rules that two communicating devices follow.

protocol

Private networks are called _____.

LANs

To provide seamless flow to networks that comprise an Internet and elaborate scheme called a(n) _____ is used.

layered protocol

Computer and printers on a LAN are connected to a _____ to communicate & transmit messages on the LAN.

switch

A(n) _____ is a special-purpose computer that receives and transmits messages on the LAN.

switch

The hardware component that connects a printer's circuitry to the networks is called a(n) ______.

NIC

Each NIC has a worldwide, unique identifier, called ______.

MAC address

An NIC built into the computer's circuitry is called a(n) ______.

onboard NIC

A(n) ______ connector is used to connect the UTP cable into NIC devices on the LAN.

RJ-45

Reducing the cross-wire signal interference that occurs when wires run parallel for long distances is made possible by _____.

twisting the wires in a UTP

The connections between switches can use UTP cable, but if they carry a lo of traffic or are far apart, _____.

the UTP cable may be replaced by optical fiber cables

IEEE LAN protocols always start with the numbers _______.

802

One of the most common optical connectors is a(n) _______.

ethernet

Most onboard NIC's support all of the following transmission rates except ______.

10,000 Mbps

Communications speeds are measured in ______.

bits

In order for a printer or laptop to connect to a wireless LAN they must have a(n) ______.

WNIC

______ is the dominant WLAN standard today.

IEEE 802.11g

Wireless devices connect to a wireless LAN using a(n) _______.

access point

The access point sends and receives wireless traffic using the _____ protocol and then communications with the switch using the _____ protocol.

802.11; 802.3

______ is a wireless protocol used to communicate over short distances.

bluetooth

Transmission speeds of 54mb/sec are commonly found when using ______.

wireless LAN

Frame relay and ATM are the protocols used for ______ networks.

PSDN

Which of the following is not a function of an ISP?

provides a dedicated network over the Internet

A ______ must be used to convert an analog signal to a digital one, when trying to transmit data over a typical phone line.

modem

Which of the following is true of DSL modems?

their signals do not interfere with voice telephone lines

_____ is good for homes and small businesses because they receive more data than they transmit.

ADSL

If a business needs high speed in both directions they should select _____ modems.

SDSL

What is the performance guarantee offered by SDSL connections?

they offer the same fast speed in both directions

Broadband communications have transmission speeds in excess of __.

256 kbps

_____ modems modulate in such a way that they do not interfere with TV signals, even though they use the same lines.

cable

Which of the following is true of cable modems?

cable modems use their own protocols

Which of the following is not a WAN protocol?

IEEE 802.3

Which of the following WAN protocols has the greatest potential for speed?

WiMax

_____ lines typically have transmission speeds less than 56 kbps.

narrowband

Broadband communications have transmission speeds in excess of _____.

256 kbps

Which of the following is an access device that connects each site to the transmission lines?

switch

A large company with production facilities in Houston, Atlanta, and Philadelphia would probably use _____ lines to transmit large amounts of data between the sites.

leased

_____ are special purpose computers that move network traffic between nodes.

routers

Which of the following is true of leased line networks?

network traffic is moved through a special-purpose computer called a modem

Which of the following transmission lines offers data transmission speeds of up to 40 Cbps?

optical fiber cables

Vendors develop and maintain leased lines and networks that are called ______.

PSDNs

The site where a leased line connects to a PSDN networks is called a(n) ______.

POP

All of the following are advantages of using PSDN except _______.

in a PSDN, separate lines connect new site to all other sites

Which of the following is not one of the protocols used by PSDN?

WiMax

Which of the following is true of the protocols used by PSDN?

ATM supports both voice and data communications

A(n) ____ uses the Internet or other Internet to create the appearance of private, point-to-point connections.

VPN

The connection between the VPN client and VPN server is called a ___.

tunnel

_____ communications are secure, even though they are transmitted over the Internet.

VPN

Which of the following applies to asymmetric encryption?

one key encodes the messages, one key decodes the message

Which is a special version of asymmetric encryption that is popular on the Internet?

public key/private key

HTTPS and SSL/TLS utilize which of the following?

a communication of public key/private key and symmetric encryption

If you see https instead of http in the address bar of your browser you are using ______.

SSL/TSL

A(n) _____ firewall examines each part of the message and decides whether it will let that part pass through to the network.

packet-filtering

A(n) _____ is a computing device that prevents unauthorized network access.

firewall

Packet-filtering firewall perform all of the following except _____.

encrypt data for transmission

_______ firewall are the simplest type of firewall.

packet-filtering

The rules about who is allowed and who is not allowed into your network are known as ______.

access control list

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