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WorksheetsUnit 2 Communication (monton de preguntas)
Total questions: 133
Worksheet time: 1hrs 21mins
What type of network is this?
Ring
Bus
Star
Mesh
What type of network is this?
Ring
Bus
Star
Mesh
In a star network
Each device is connected to a switch or hub
Each device connects to each other
Each device is connected in a line
Each device is connected to a terminal
Which network topology is the most common way of setting up a network?
Star
Ring
Bus
A terminator
Makes the network quicker
Sends Data Packets
Stops data collisions
Connects devices to the internet
What term describes the physical layout of a network?
Topology
topping
topiology
toppology
What type of network topology shown in the picture?
Bus topology
Ring topology
Star topology
Tree topology
Base on the picture given, determined whether the statement below is TRUE or FALSE
"The centeral communication device on this network must be a Server."
FALSE
TRUE
What is the correct description for the type of topology shown in the picture?
All of the nodes in the network must be connected to each other for the network to work.
All nodes must be connected to a centeral communication device
All the nodes must connect to a central cable that act like the backbone for the network
a cable forms a closed loop with all computers and devices arranged
along the ring.
Base on the picture given, determined whether the statement below is TRUE or FALSE
"A terminator is required at each end of the bus cable to prevent the signal from bouncing back and forth on the bus cable."
FALSE
TRUE
Which network topology uses a server?
Star
Mesh
Ring
None
What does a Hub do?
Once received sends data packets to all workstations
Sends data packets only to intended recipient using MAC address
Sends data packets through the internet
Reduces network traffic
Which network topology needs a switch or hub?
Mesh
Partial Mesh
Star
Bus
Which network topology would you typically find in most homes?
Star
Bus
Mesh
WiFi
I don't have a server in my network. What type of network is this?
Mesh
Star
Client-Server
Peer-2-Peer (P2P)
What is a network?
A group of 1 or more devices which communicate
A group of 2 or more devices which communicate
When 2 or more computers are in the same building.
A group of 3 or more devices which communicate
What are two factors that affect network performance?
Traffic and bandwidth
Lag and ping
Banter and bants
What is bandwidth?
The amount of data that can be carried at any one time.
The overall amount of data I use in a month.
The speed of my data per second to a friend and back.
What are the most common network usage models?
Peer-to-peer and Client-Server
LAN and WAN
Star and Mesh
WiFi & Bluetooth
If a network has WiFi, it means it has internet access
True
False
Choose all that are true about star networks
All devices have a connection to a central switch or server
They are the most fault tolerant type of network
If one connection fails, only that one device is affected
They can be expensive because of the large amount of cabling needed
Choose all that are true about WiFi
WiFi is a wireless protocol
WiFi is just a catchy name for the protocol IEEE 802.11
WiFi needs Ethernet cables to connect you to it
WiFi is just another name for Internet
All data transmitted between nodes in the network is transmitted over this common transmission medium and is able to receive by all nodes in the network simultaneously.
BUS TOPOLOGY
STAR TOPOLOGY
RING TOPOLOGY
MESH TOPOLOGY
A signal containing the address of the intended receiving machine travels from a source machine in both directions to all machines connected to the bus until it finds it intended recipient
RING TOPOLOGY
BUS TOPOLOGY
TREE TOPOLOGY
STAR TOPOLOGY
It is a peer to peer topology.
MESH TOPOLOGY
BUSH TOPOLOGY
RING TOPOLOGY
STAR TOPOLOGY
What is a disadvantage of a LAN?
Site (software) licences are likely to be cheaper than buying several standalone licences.
Security is good - users cannot see other users' files unlike on stand-alone machines.
if the main cable fails or gets damaged the whole network will fail
Purchasing the network cabling and file servers can be expensive.
A series of number used to identify a network device.
IP Address
IM Address
MAC Address
OP Address
Which protocol would you use to transfer hypertext?
FTP
SMTP
POP3
HTTP
A device used in a wired network that connects multiple computers and devices to share data.
Hub
Modem
Router
Server
What is a server?
Powerful Computers that provide services to other computers
Computers that ask for the services a server provides
Physical connection between devices
A circuitboard with the components to send/receive data
Half Duplex transmission is where:
Data can only be transmitted in one direction
Data can be transmitted in one direction at a time
Data can be sent both ways at the same time
A made up term to confuse us
Simplex transmission is where:
Data can only be transmitted in one direction
Data can be transmitted in one direction at a time
Data can be sent both ways at the same time
A made up term to confuse us
Full Duplex transmission is where:
Data can only be transmitted in one direction
Data can be transmitted in one direction at a time
Data can be sent both ways at the same time
A made up term to confuse us
Parallel transmission is where
1 bit is transmitted at a time
Data can only be transmitted in one direction at a time
8 bits are transmitted at the same time
8 elephants are ridden at the same time
Which 2 are advantages of a Star Network Topology?
Fast data transfer as there are fewer data collisions
If one cable fails the other workstations are not affected
easy to install
less cable needed so cheaper to set up
Which 2 are advantages of a Bus Network Topology?
Fast data transfer as there are fewer data collisions
If one cable fails the other workstations are not affected
easy to install
less cable needed so cheaper to set up
Which 2 are Disadvantages of a Bus Topology?
Requires additional hardware such as the central hub or switch
if the main cable is damaged or fails the whole network fails
More collisions with lots of machines on the network
If the central device fails the whole network goes down.
Which 2 are Disadvantages of a Star Topology?
Requires additional hardware such as the central hub or switch
if the main cable is damaged or fails the whole network fails
More collisions with lots of machines on the network
If the central device fails the whole network goes down.
Mostly used for long distance transmission?
Fibre Optic Cable
Copper
Very expensive - requiring specialist network hardware.
Fibre Optic Cable
Copper
The process of converting data into a form that is not easily recognized or understood by anyone who is not authorized to access the data.
Bluejacking
Syncing
Encrypting
Decrypting
A computing infrastructure in which resources, such as storage and applications, are hosted in a distributed fashion by a third party over the Internet.
ad hoc
Peer-to-peer
Cloud Computing
telepresence
The IEEE encryption standard that provides improved encryption for wireless networking.
802.11
811.02
112.08
8011.2
An adapter or device that enables you to connect to other computers and the Internet by using an analog phone line.
Router
Modem
NFC
NAS
What is an advantage of a peer to peer network?
Security can be managed centrally
Cheap and easy to set up
Will stop working if one of the peers goes down
You need high end computers to keep everything working
Which network topology is this?
Star
Mesh
Ring
Bus
Bluetooth and WiFi have similarity in ...
have the same effective range areas
have better security compare with cable network
use the same transmission frequency
use radio waves to transmits information
What is a standalone computer?
A computer that is not connected to a network
A computer that is being used as a server
A computer that does not have any peripherals attached to it
A computer that is used by only one person
Which of these statements is true?
A client-server network has a central computer that provides services to the rest of the network
A client-server network is cheap and easy to set up
A client-server network cannot be used to share files
Each computer on a client-server network is maintain separately
A piece of hardware that connects to a computer
peripheral
protocol
firmware
BIOS
can be used to filter between trusted and untrusted networks and prevent programs from communicating through the use of ports.
firewall
encryption
anti-virus software
command line
Transmission capacity measure by bit rate
Bandwidth
Bit
Latency
Protocol
A contraction of "Binary Digit"
Bandwidth
Bit
Latency
Protocol
he number of bits that are conveyed or processed per unit of time. e.g. 8 bits/sec.
Bandwidth
Bit
Latency
Bit rate
When responding to a question with 4 choices, the most efficient method will require _____ number of bits.
2 bits
5 bits
4 bits
8 bits
The type of signal that is sent through Fiber Optic Cable is
Electric Voltage
Bean of light
Alternating frequencies
Smoke signal
Which of the following statements are true about the Internet?
I - The Internet connects devices and networks all over the world
II - The Internet helps people collaborate to solve problems
III - The Internet helps people communicate
IV - There are no negative consequences of the Internet, it is purely positive
I only
I and II only
I, II, and III
I, II, III, and IV
What is the latency of a system?
The amount of data (in bits) that can be transmitted at any given time
The distance that data needs to travel in a network
The time it takes for a bit to travel from sender to receiver
The strength of the network connection
How is the bandwidth of a network measured?
Bitrate. Higher bitrate means higher bandwidth.
Voltage. Higher voltage means higher bandwidth.
Frequency of waves. Higher frequency means higher bandwidth.
Light. More light means higher bandwidth.
What is the bitrate of a system?
The number of bits used to encode a single letter
The amount of data (in bits) that can be sent in a fixed amount of time
The strength of the network connection
The distance that data needs to travel in a network
Suppose we used an Internet Addressing protocol that used 4 bits to encode a single address. How many devices would be supported on the Internet? How many unique addresses would there be?
4
8
16
32
64
What does URL stand for?
Underlying Request Layout
Underlying Response Layout
Uniform Resource Locator
Usable Render List
What is the first step of viewing a web page ?
The Response: The server sends a response to the browser with the resource attached
The Request: The browser sends a message to a server requesting a resource
Rendering the Page: Your browser takes the resource and renders it in the browser window
The URL: You type the URL for the web page into your browser
What is the fourth step of viewing a web page ?
The Response: The server sends a response to the browser with the resource attached
The Request: The browser sends a message to a server requesting a resource
Rendering the Page: Your browser takes the resource and renders it in the browser window
The URL: You type the URL for the web page into your browser
What is the function of the Domain Name System (DNS)?
To sell website names to web developers
To assign a unique domain name to every computer
To make sure that each IP address has only one corresponding domain name
To translate domain names into IP addresses
According to the Domain Name System (DNS), which of the following is a subdomain of the domain example.com?
about.example.com
example.com/home
example.com.org
example.org
org.example.com/home
Which is true of parallel computing?
This system is not difficult to set up and organize.
This type of processing is always faster than a sequential system.
It is not difficult to pinpoint where an error may lie.
There are multiple processors running at the same time.
What is a DNS spoofing attack?
A hacker sends a forged email asking a user to enter their password or other sensitive information for a given website, then steals the information
A hacker overwrites the data for a given domain name in a DNS server, causing the IP for that domain to point to the hacker’s website rather than the intended website.
A hacker takes control over hundreds or thousands of computers, and sends several requests from those computers to a particular IP address, causing the computer at that IP address to crash.
A hacker gets a victim to install software on their computer, and that software is able to run in the background and send private information back to the hacker.
Which of the following are true statements about digital certificates in Web browsers?
I. Digital certificates are used to verify the ownership of encrypted keys used in secure communication.
II. Digital certificates are used to verify that the connection to a Web site is fault tolerant.
I only
II only
I and II
Neither I nor II
Which of the following is a benefit of the fault-tolerant nature of Internet routing?
The ability to use a hierarchical naming system to avoid naming conflicts
The ability to provide data transmission even when some connections between routers have failed
The ability to resolve errors in domain name system (DNS) lookups
The ability to use multiple protocols such as hypertext transfer protocol (HTTP), Internet protocol (IP), and simple mail transfer protocol (SMTP) to transfer data.
chooses an application to run on the server
A thin-client
A thick-client
An annoying-client
A kiwi
receives output from the application.
A thin-client
A thick-client
An annoying-client
A banana
sends input data to the server when requested by the application
A thin-client
A thick-client
An annoying-client
A tomato
chooses an application provided by the server
A thin-client
A thick-client
An annoying-client
A potato
possibly carries out some processing before running the application on the server and also after receiving output from the application
A thin-client
A thick-client
An annoying-client
A banh mi
Reorder the following:
(Ethernet) The transmitter uses the following procedure.
step 1: Check the voltage on the transmission medium
If this indicates activity, wait a random time before checking again.
If no activity is detected, start transmission.
Continuously check for a collision.
If no collision is detected, continue transmission.
If a collision is detected, stop transmission of the message and transmit a jamming signal to warn all end-stations; after a random time, try again.
"Cloud computing is the provision of computing services usually via the Internet."
The organisation takes full responsibility for creating and managing the cloud installed on-site and connected to a private network
private cloud
public cloud
"Cloud computing is the provision of computing services usually via the Internet."
The organisation outsources to a third-party the creation and management of an on-site installation connected to a private network
private cloud
public cloud
"Cloud computing is the provision of computing services usually via the Internet."
The organisation outsources the creation and management of an Internet accessible system by a third-party.
private cloud
public cloud
"Cloud computing is the provision of computing services usually via the Internet."
managed and owned by a third-party cloud service provider.
private cloud
public cloud
The IPv4 addressing scheme is based on (a) ( (b) ) being used to define an IPv4 address.
This IPv6 address 68E6:7C48:FFFE:FFFF:3D20:1180:695A:FF01 is
Valid
Invalid
This IPv6 address 72E6::CFFE:3D20:1180:295A:FF01 is
Valid
Invalid
This IPv6 address 6C48:23:FFFE:FFFF:3D20:1180:95A:FF01 is
Valid
Invalid
This IPv6 address 68E6:7C48:FFFE:FFFF:3D20:1180:695A is
Valid
Invalid
This IPv6 address 68G6:7C48:FXFE:FFFZ:3D20:1180:695A:F01 is
Valid
Invalid
This IPv4 address 10.255.256.255 is
Valid
Invalid
This IPv4 address 1F0.250.0.10 is
Valid
Invalid
This IPv4 address 192.168.255.255 is
Valid
Invalid
This IPv4 address 0.0.0.0 is
Valid
Invalid
"HTTP runs on a client–server architecture; the web browser on your device is called the 'client', it requests web pages and linked resources from the web server. The client can also send limited data back to the web server as the user interacts with the web page."
The communication between clients and servers is achieved through requests and responses:
The server waits and listens for requests
The client sends an HTTP request for a web page to the server
The server receives the request
The server sends an HTTP response which encapsulates the requested page
The client receives the response and displays the web page in the web browser
the numerical label assigned to each device participating in a computer network that uses the Internet Protocol
IP address
MAC address:
email address
NIC
DHCP
The most common form of IP Address is “ (a) ” which requires 32 bits ( (b) ) to store an address.
Address provided to home network by ISP
Public IP Address
Private IP Address
Address is unique throughout Internet
Public IP Address
Private IP Address
Allows two computers to identify each other
Public IP Address
Private IP Address
Address issued by router to each device in home network
Public IP Address
Private IP Address
Address only unique in the network and cannot be accessed through the internet
Public IP Address
Private IP Address
Domain Name Service (DNS)
naming system used for computers or resources having internet connection
Domain Name
humanly-memorable names for Internet participants such as computers and networks.
Router
A device that forwards packets of data between networks using IP addresses
Dedicated Line
A telecommunications path between two points
WWW
system of interlinked hypertext
documents accessed via the Internet
(a) is the general term used to explain the (b) that occurs when any component within a computer system is responding to an instruction. This is because the instruction is being transmitted down cables, through buses and logic gates, all of which takes time.
is the term used to describe the amount of data that can be
transmitted along a communication channel.
(a)
(a) transmission does not require the permanent synchronisation of the sender’s and receiver’s system clocks. Instead, it (b) only for the duration of the (c) by sending additional bits of information called start and stop bits.
Match the following. –Requesting data from a database server
step 1
The client web browser application requests the page using the URI.
step 2
The DNS directs the request to the appropriate domain.
step 3
The server retrieves the page.
step 4
The server sends the page content, consisting of HTML tags and text content only, to the client.
step 5
The client web browser software ‘renders’ the page and displays it.
Match the following
network made up of a combination of other network topologies
Hybrid network
method of data storage where data is stored on off-site servers.
Cloud storage
situation in which the same data is stored on several servers in case of maintenance or repair.
Data redundancy
a server on a network where central files and other data are stored. They can be accessed by a user logged onto the network.
File server
network that uses separate dedicated servers and specific client workstations. All client computers are connected to the dedicated servers.
Client-server
Match the following
type of cable in which two wires of a single circuit are twisted together. Several twisted pairs make up a single cable.
Twisted pair cable
cable made up of central copper core, insulation, copper mesh and outer insulation.
Coaxial cable
way of reducing the length of an IPv6 address by replacing groups of zeroes by a double colon (::); this can only be applied once to an address to avoid ambiguity.
Zero compression
device that connects LANs which use different protocols.
Gateway
device which enables data packets to be routed between different networks (for example, can join LANs to form a WAN)
Router
(a) – communication where pieces of data are sent from sender to receiver.
(b) – situation in which two messages/data from different sources are trying to transmit along the same data channel.
(c) – carrier sense multiple access with collision detection – a method used to detect collisions and resolve the issue.
(d) – contiguous sequence of digital bits sent over a network/internet.
(e) - way of reducing the length of an IPv6 address by replacing groups of zeroes by a double colon (::); this can only be applied once to an address to avoid ambiguity.
(a) – store which holds data temporarily
(b) – situation in which two devices have the same IP address.
(c) – device used to boost a signal on both wired and wireless networks.
(d) – network in which each node can share its files with all the other nodes. Each node has its own data and there is no central server.
The differences between the internet and the World Wide Web
Select the correct answer to match the statement.
"It is a massive network of networks which are made up of various computers and other electronic devices."
Internet
World Wide Web
The differences between the internet and the World Wide Web
Select the correct answer to match the statement.
"It makes use of transmission control protocol (TCP)/internet protocol (IP).."
Internet
World Wide Web
The differences between the internet and the World Wide Web
Select the correct answer to match the statement.
"It is a collection of multimedia web pages and other documents which are stored on websites."
Internet
World Wide Web
The differences between the internet and the World Wide Web
Select the correct answer to match the statement.
"The http(s) protocols are written using HyperText Mark-up Language (HTML)."
Internet
World Wide Web
The differences between the internet and the World Wide Web
Select the correct answer to match the statement.
"Uniform resource locators (URLs) specify the location of all web pages.."
Internet
World Wide Web
The differences between the internet and the World Wide Web
Select the correct answer to match the statement.
"Web resources are accessed by web browsers."
Internet
World Wide Web
(a) addressing has been developed to overcome some of the problems associated with (b) . This system uses (c) addressing , which allows for much more complex addressing structures.
IPv6 has been designed to allow the internet to grow in terms of number of hosts and the potential amount of data traffic. IPv6 has benefits over IPv4.
Select all the correct benefits
removes risk of private IP address collisions
allows for more efficient routing.
has no need for NATs (network address translation)
improve data transition latency
reduce DoS attacks
IPv6 addresses can be quite long; but there is a way to shorten them using
(a)
(a) – collection of multimedia web pages stored on a website; uses the internet to access information from servers and other computers.
(b) – carrier sense multiple access with collision detection; a method used to detect collisions and resolve the issue.
(c) – way of reducing the length of an IPv6 address by replacing groups of zeroes by a double colon (::); this can only be applied once to an address to avoid ambiguity.
Reorder the following Website address structure
protocol
domain host
domain name
domain type
The domain name service (DNS) gives domain names for internet hosts and is a system for finding IP addresses of a domain name.
Domain names eliminate the need for a user to memorize IP addresses.
The DNS process involves converting a host name into an IP address the computer can understand.
Reorder the DNS process steps:
The user opens their web browser and types in the URL and the web browser asks the DNS server for the IP address of the website.
The DNS server can’t find in its database or its
cache and sends out a request to DNS server.
DNS server finds the URL and can map it to an IP address; the IP address is sent back to DNS server which now puts the IP address and associated URL into its cache/database.
This IP address is then sent back to the user’s computer.
The computer now sets up a communication with the website server and the required pages are downloaded. The web browser interprets the HTML and displays the information on the user’s screen.
