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WorksheetsFundamentals - Comms & Networking
Total questions: 114
Worksheet time: 2hrs 43mins
One Transmission method is Serial, what is the other?
(a)
Data transmission can be controlled using a timing signal such as a -----
(a)
What type of transmission sends data in blocks whilst sharing a clock signal?
(a)
Data is commonly sent on the ----------------- of a clock pulse so the receiving device knows when data is being sent
beginning
end
leading edge
mid point
Is a clock used in Asynchronous data transmission?
yes
no
What are used instead of a clock in Asynchronous transmission?
Start bits
Stops bits
Both
A receiving device begins listening once a -------- is received and ends once a ----------- is subsequently received.
(a)
Data is read at predetermined intervals by the receiving device using its own ----------- --------
(a)
------------- transmission occurs when data is sent simultaneously along different lines and -------------
(a)
Can More or Less data be sent in a Parallel cycle?
More
Less
Parallel links are subject to what problem when running at a high frequency?
Crosstalk
Crashing
Interference
Blockages
----------- transmission occurs across a single wire or channel by sending each part separately
(a)
Serial transmission can run at much ------- frequencies than Parallel transmission, resulting in an overall ---------- data throughput than parallel.
(a)
The rate at which information is transmitted across a comms channel is called ------- rate, measured in -----------s
(a)
The rate at which data is transmitted is called --- rate
(a)
The amount of data that can be transmitted at any one time across a channel is --------------
(a)
Any measured delay in the receiving of transmitted data is called -----------
(a)
---------- are the sets of rules that communicating devices follow to ensure the accurate sending and receiving of messages.
(a)
A symbol
can consist of multiple bits
is measured per second to give baud rate
consists of a single bit
baud rate can be
higher than the bit rate
equal to the bit rate
lower than the bit rate
Bit rate is directly ----------------- to bandwidth
(a)
As more bandwidth is made available, the number of bits that can be sent --------------
(a)
The arrangement of computers and network hardware is defined as its ------------
(a)
Which topology has a central hub with communicating devices connected directly to it.
(a)
Logical topologies
define how devices on a network communicate
define how devices on a network are connected
do not always reflect a physical layout
A network where communicating devices are all connected but only two can communicate at any one time are in a -------- topology.
(a)
In a peer to peer network
Clients request services such as file access and email from the server.
There are other computers on the network acting as servers in a centralised manner
Each host decides what it shares and who has specific access
all hosts have equal status
A Network host is a device on a network identified by a (a) address on that network
In a peer to peer network is there centrally controlled storage?
No
Yes
Sometimes
Features of a Client Server network
Easier to manage centrally
Each node is responsible for its own config and behaviour on the network
most computers are nominated as Clients
All clients have to authenticate to access data held on the Server
Features of a LAN;
self contained small geographical area
a network of networks
communication is isolated and private
the Internet is an example of a large LAN
Features of a WiFi network
liable to malicious interception of signals
based on International Standard 802.11
based on International Standard 801.22
require specialist components
WPA/WPA2
WiFi Protected Access
Wide Point Access
Sophisticated Encryption of data
A security measure on a wireless network
SSID stands for --------- --- -----------
(a)
SSID
is open broadcast
is broadcast disabled
a label that identifies a wireless network
the identifier of a wireless network is hidden
MAC is
(a)
MAC is
address blacklisting
address whitelisting
a list of addresses of wireless network adapters not allowed on the network
all devices without an allowed address are rejected from the network
Can devices on wireless networks communicate on the same channel at the same time?
Yes
No
CSMA stands for
(a)
In controlling the sending / receiving of data, CA stands for
(a)
To bridge the gap between wireless network adaptors you would use a ------------ ------------- adapter
(a)
A wireless Network Adapter can be
hardware plugged into each device
built into the device itself at the point of manufacture
shared between devices
The CSMA/CA works by waiting a RANDOM amount of time before trying again, when a communication channel is busy, True or False
False
True
RTS stands for
(a)
CTS stands for
(a)
An ISP is an
(a)
An ----------- ------------- is an organisation that manages the allocation of internet resources within a geographic region.
(a)
A network device which controls communication between different network is a --------
switch
modem
gateway
router
The major data route between key points within a network is called a -------------
(a)
Routers move packets of data on to other routers until they reach their destination in a process called -------- ----------
(a)
Not all connections on the internet use the same protocol, so where this happens, devices called ----------- handle the translation between networks.
(a)
Packets are assembled from chunks of original data together with a header and -----------
(a)
A packet header contains
a checksum value
MAC address of the sender and receiver
details of the protocol being used
a packet number or sequence number
A URI is a uniform resource ---------- and a URL is a uniform resource ------------
(a)
An identifier for each device on a network is an -- ------------
(a)
AS an IP address is not user friendly a ---------- name is used instead.
(a)
The complete domain location of a specific resource within the DNS is called a FQDN which stands for
(a)
The structure of domains is hierarchical
True
False
.com and .org are examples of low level domains
True
False
To protect a private network client when accessing the internet a ------ server is used.
(a)
what is the name of the process which checks packet headers to ensure they contain the type of packet data allowed by that network - packet -----------
(a)
--------------- inspection is the examination of packets to determine if they are part of a valid communication chain with an internal client.
(a)
----------- encryption is a secret key applied to messages that only the communicating devices know about.
(a)
----------- encryption - data encrypted with these keys can only be decrypted with a paired private key.
(a)
encryption keys can be transferred
in-band
out of band
multi band
A Certificate Authority can issue a ----------- certificate to prove the identity of the sending client.
(a)
With a digital signature, the entire message is ---------- . This value is encrypted with the sender's private key, meaning only the provider of the paired public key could possibly have sent the message.
(a)
A ------- is a self replicating piece of malware
(a)
Malicious code hidden inside legitimate-looking sources, that trick users into executing it, is called a ---------
(a)
improved code ------------ is the developing and testing of software thoroughly to mitigate vulnerabilities
(a)
TCP/IP stands for -------- control protocol / ------------ protocol
(a)
How many layers of TCP/IP are there?
2
3
4
5
Which layer of TCP/IP ensures that data sent is in a consistent format as expected by the receiving device
(a)
Which layer of TCP/IP breaks apart the data to be sent and ensures that the order of the parts is maintained?
(a)
Which layer of TCP/IP records the IP address of both the sending and receiving devices so that they can locate one another across the network?
(a)
Which layer of TCP/IP interacts with the physical medium by which the communication will travel, adding hardware MAC addresses so that traffic can be directed appropriately?
(a)
What does HTTP stand for? which controls the sending / receiving of World Wide Web resources.
(a)
In addition to IP address information, data packets specify the ---- that the receiving device should be listening on.
(a)
Examples of well known ports are
PORT 80 - HTTP
PORT 110 - POP3
PORT 1
PORT 53
Ports above what number are free to use as client ports for private network purposes?
(a)
Below port number ----- ports that different common services use are reserved and above this, they are unreserved.
(a)
The destination IP address and port number combine to create a ------
(a)
FTP stands for ----- -------- ---------
(a)
what controls the communication of hypermedia documents? in abbreviated form
(a)
What does POP in POP3 stand for?
(a)
What does SMTP stand for?
(a)
What protocol provides a secure channel between two points so that unsecured data can be sent? unabbreviated
(a)
Uses of SSH
SSH uses a peer to peer network
An SSH server is run on the target machine, listening for connections from clients.
An SSH connection to a server creates an encrypted tunnel that hides the traffic inside
Email is handled using ------------ servers
(a)
The -- address of an email server is recorded in the -------- records.
(a)
IP addresses are constructed from four ------ of binary data separated by full stops.
(a)
IP addresses are consist of 2 parts, a ---------- identifier and a ---- identifier
(a)
An octet is a group of ? bits
(a)
What is used to identify where the network identification portion of an IP address ends and where the host identifier begins? a ------- ------
(a)
The limited number of values possible for version 4 IP addresses has meant a newer standard of IP address is required, this is IP version 6 which uses --------------- numbers separated by ---------
(a)
What does DHCP stand for?
(a)
DHCP is a protocol which allows IP addresses of hosts to be ---------------- prior to communicating on a network
(a)
When a host boots, its ---- DHCP is polled to request an IP address and other network settings such as the ------ mask and primary DNS servers.
(a)
NAT stands for
(a)
NAT is a service which provides translation between two different __ _________ spaces
(a)
---- forwarding works on the edge of the network to relay traffic to an appropriate server hosted on a private network.
(a)
What kind of protocol provides a persistent connection between a client and server, removing the need for a request/response cycle initiated by the client?
(a)
Using a websocket protocol, data can be sent full ------- allowing the server of a web page to refresh elements as and when they change.
(a)
---- duplex is where one node can communicate at one time.
(a)
what does CRUD stand for?
(a)
What are the equivalent SQL commands for CRUD?
(a)
What does REST stand for?
(a)
In REST, Create Retrieve Update Delete use - POST GET --- & -------
(a)
Different methods can be used by web services to format data objects between servers and clients. Javascript Object Notation is known as ---- and XML is known as Extensible ------- Language
(a)
JSON is easier to read by humans and can be -------- to break it down into component parts read for processing.
(a)
Thick or Thin client computing uses standard PC hardware to act as clients on the network. Clients handle processing tasks themselves, only calling on network services when needed.
Thin
Thick
Limited computer terminals connected to a central server across the network where the user's session is being hosted is called a Thin or Thick client network?
Thick
Thin
Are these features of a Thin or Thick network? Low cost basic terminals which are easier to maintain and support?
Thin
Thick
Are these features of a Thin or Thick network? They don't require continuous network access or highly specified, costly servers. They perform better where intensive processing is required.
Thin
Thick
