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WorksheetsUnit 19 - OSI model - RECAP
Total questions: 73
Worksheet time: 3hrs 32mins
Name
Class
Date
1.
What is the name of layer 1 in the OSI model?
a)
Physical
b)
Data Link
c)
Network
d)
Transport
e)
Session
2.
What is the main functionality of layer 1 in the OSI model?
a)
To transmit the individual bits from one node to another node
b)
Error-free transfer of data frames
c)
Determines the best path to move data from source to destination
3.
Which of these are true about how data can be represented?
a)
Analogue form
b)
Digital form
c)
Radio form
d)
Bit form
4.
Which of these statements about analogue-to-digital conversion is true?
a)
Computers need the information to be in digital form
b)
Computers can read raw analogue data, analogue-to-digital conversion is done for the end-user
c)
Computers need the information to be in analogue form
5.
Which of these statements is true about simplex?
a)
In simplex mode, the communication is unidirectional, i.e., the data flow in one direction.
b)
In simplex mode, direction can be reversed, i.e., the station can transmit and receive the data as well.
c)
In simplex mode, the communication is bi-directional, i.e., the data flow in both the directions.
6.
Which of these statements is true about Full-duplex?
a)
In full duplex mode, the communication is bi-directional, i.e., the data flow in both the directions.
b)
In full duplex, direction can be reversed, i.e., the station can transmit and receive the data as well.
c)
In full duplex mode, the communication is unidirectional, i.e., the data flow in one direction.
7.
Definition of Guided Media
a)
Guided media is defined as the physical medium through which the signals are transmitted.
b)
An guided transmission transmits the electromagnetic waves without using any physical medium.
8.
Definition of Unguided Media
a)
An unguided transmission transmits the electromagnetic waves without using any physical medium.
b)
Unguided media is defined as the physical medium through which the signals are transmitted.
9.
What is the name of the 2nd layer of the OSI model?
a)
Data Link
b)
Physical
c)
Network
d)
Transport
10.
What is the Data Link layer responsible for?
a)
Error-free transfer of data frames.
b)
Manages device addressing.
c)
Physical connection.
11.
What are the areas that is included in the data link layer? Select 4
a)
MAC Address
b)
Flow Control
c)
Error Control
d)
Reliable Delivery
e)
Authentication
12.
What sort of devices operates at the Data Link layer?
a)
Switch
b)
Server
c)
Router
d)
Mobile Phone
e)
Desktop PC
13.
What does MAC stand for?
a)
Media Access Control
b)
Media Authentication Control
c)
Majority Access Control
d)
Media Access Computer
14.
Which three statements are true about MAC address?
a)
MAC address is the physical address, which uniquely identifies each device on a given network.
b)
MAC address is globally unique, meaning that two devices cannot have the same MAC address.
c)
MAC address is written in hexadecimal format.
d)
MAC address is written in decimal format.
15.
Which three functions does the data link layer provide?
a)
Line Discipline
b)
Error Control
c)
Flow Control
d)
Authentication
e)
Authorisation
16.
What is the name of the 3rd OSI layer?
a)
Network
b)
Transport
c)
Data Link
d)
Session
e)
Physical
17.
What is the purpose of the 3rd OSI layer?
a)
Manages device addressing, tracks the location of devices on the network and determines the best path to move data from source to destination.
b)
Transmits the individual bits from one node to another node.
c)
Ensures that messages are transmitted in the order in which they are sent and there is no duplication of data.
d)
Used to establish, maintain and synchronises the interaction between communicating devices.
18.
What is a network address?
a)
Logical Address
b)
Physical Address
19.
How many bits is an IPv4 address?
a)
32
b)
24
c)
40
20.
Which one is an example of a IPv4 address?
a)
192.168.0.1
b)
192.168.0.1.2
c)
192.168.0.257
d)
192.168.0.F
21.
In most circumstances, how many interfaces does a host have?
a)
1
b)
2
c)
3
d)
0
22.
Which two are examples of a host?
a)
Desktop PC
b)
Server
c)
Router
d)
Switch
e)
Access Point
23.
What are the four types of IP addresses?
a)
Public, Private, Static, Dynamic
b)
Pubg, Private, Static, Dynamic
c)
Public, Privacy, Static, Dynamic
d)
Public, Private, Stats, Dynamic
e)
Public, Private, Static, Dyson
24.
What is a Public IP address?
a)
A public IP address is an address where one primary address is associated with your whole network. In this type of IP address, each of the connected devices has the same IP address.
b)
A public IP address is a unique IP number assigned to every device that connects to your home internet network, which includes devices like computers, tablets, smartphones, which is used in your household.
25.
What is a Private IP address?
a)
A private IP address is a unique IP number assigned to every device that connects to your home internet network, which includes devices like computers, tablets, smartphones, which is used in your household.
b)
A private IP address is an address where one primary address is associated with your whole network. In this type of IP address, each of the connected devices has the same IP address.
26.
What is a Static IP address?
a)
A static IP address is an IP address that cannot be changed.
b)
Static IP addresses always keep changing. It is temporary and are allocated to a device every time it connects to the web.
27.
What is a Dynamic IP address?
a)
Dynamic IP addresses always keep changing. It is temporary and are allocated to a device every time it connects to the web
b)
A dynamic IP address is an IP address that cannot be changed.
28.
Which IP address is an example of IPv4?
a)
83.68.124.21
b)
50b2:6400:0000:0000:6c3a:b17d:0000:10a9
29.
Which IP address is an example of IPv6?
a)
50b2:6400:0000:0000:6c3a:b17d:0000:10a9
b)
83.68.124.21
30.
Which two are private IP addresses?
a)
10.0.0.1
b)
172.16.0.1
c)
192.141.0.1
d)
83.123.153.1
31.
Why was classless addressing created?
a)
To solve the inability of classful addressing to resize networks.
b)
The name classful was an old name.
32.
Complete the sentence: With Classless addressing, addresses can be......
a)
allocated much more efficiently.
b)
shown to the public.
c)
private
d)
secure
33.
Which two are used in the Classless concept?
a)
CIDR (Classless Inter Domain Routing)
b)
VLSM (Variable Length Subnet Mask)
c)
CIDR (Classful Inter Domain Routing)
d)
VLSM (Variable Length Subnet Masking)
34.
How many unused IPs would you have if you used a /28 subnet for 10 IP addresses?
a)
4
b)
6
c)
8
d)
2
e)
5
35.
How many IP addresses in total are required in the image?
a)
10
b)
12
c)
6
d)
8
36.
How many IP addresses in total are required in the image?
a)
24
b)
16
c)
20
d)
28
37.
Which best describes routing?
a)
Routing is the process of selecting the best path, of which data can be transferred from source to destination.
b)
Routing is the process of selecting the worst path, of which data can be transferred from source to destination.
38.
What are the two ways to conduct routing?
a)
Static
b)
Dynamic
c)
Dynastic
d)
Statin
39.
Which one best describes static routing?
a)
The network administrator manually adds the routes in the routing table.
b)
The router adds a new router in the routing table for each packet in response to the changes in the condition or topology of the network.
40.
Which one best describes dynamic routing?
a)
The router adds a new router in the routing table for each packet in response to the changes in the condition or topology of the network.
b)
The network administrator manually adds the routes in the routing table.
41.
Which two are routing protocols?
a)
RIP
b)
OSPF
c)
BGR
d)
IGPF
e)
IS-PF
42.
Which three are routing metrics?
a)
Hop count
b)
Delay
c)
Bandwidth
d)
Size
e)
Congestion
43.
What is the fourth layer of the OSI model?
a)
Transport
b)
Network
c)
Session
d)
Data Link
e)
Presentation
44.
What is the main role of the transport layer?
a)
The main role of the transport layer is to provide the logical communication services directly to the application processes running on different hosts.
b)
The main role of the transport layer is to provide error-free transfer of data frames.
c)
The main role of the transport layer is to manage device addressing and track the location of devices on the network.
45.
Which device is the transport layer implemented in?
a)
End Device
b)
Router
c)
Switch
46.
True or False?<br />"The transport layer ensures that messages are transmitted in the order in which they are sent and there is no duplication of data."
a)
true
b)
false
47.
What does TCP stand for?
a)
Transmission Control Protocol
b)
Transmit Control Protocol
c)
Transmit Control Prototype
d)
Transmission Control Prototype
48.
What does UDP stand for?
a)
User Datagram Protocol
b)
Uniform Datagram Prototype
c)
User Data Protocol
d)
User Datagram Prototype
49.
Which is faster, UDP or TCP?
a)
UDP
b)
TCP
50.
Which one best describes the difference TCP and UDP?
a)
TCP is more secure, while UDP is faster.
b)
TCP is faster, while UDP is more secure
51.
What is the three-way handshake?
a)
The three-way handshake is used with TCP. It first sends out a connection request to the receiver, the receiver responds to the sender's request, the sender responds that it has indeed received the response from the sender.
b)
The three-way handshake is used with UDP. It first sends out a connection request to the receiver, the receiver responds to the sender's request, the sender responds that it has indeed received the response from the sender.
52.
Which 2 examples are use cases of TCP?
a)
SSH
b)
Web
c)
Media Streaming
d)
Multiplayer Games
53.
Which 2 examples are use cases of UDP?
a)
Media Streaming
b)
Multiplayer Games
c)
SSH
d)
Web
54.
What is a port, in terms of transport layer?
a)
A port is a virtual point (software-based), where network connections start and end.
b)
A port is a physical point, where network connections start and end.
c)
A port is an ethernet port, where cables are physically connected to the device.
55.
What is the purpose of a port number?
a)
A port number is a way to identify a specific process to which an internet or other network message is to be forwarded when it arrives at a server.
b)
A port number is a way to identify a specific IP address to which an internet or other network message is to be forwarded when it arrives at a server.
56.
Why block specific ports on a firewall?
a)
Some attackers try to send malicious traffic to random ports in the hopes that those ports have been left “open”, meaning they are able to receive traffic.
b)
Cause why not.
c)
The more ports open, the more CPU usage
57.
What are the port numbers of the following:<br />A. SSH<br /><br />B. HTTP<br /><br />C. HTTPS
a)
A. 22<br /><br />B. 80<br /><br />C. 443
b)
A. 80<br /><br />B. 443<br /><br />C. 22
c)
A. 443<br /><br />B. 22<br /><br />C. 80
58.
What is the 5th layer of the OSI model?
a)
Session
b)
Transport
c)
Presentation
59.
What is the purpose of the Session Layer?
a)
The Session layer is used to establish, maintain and synchronises the interaction between communicating devices.
b)
A Session layer is mainly concerned with the syntax and semantics of the information exchanged between the two systems.
c)
A Session layer serves as a window for users and application processes to access network service.
60.
Which two are included in the Session layer?
a)
Authentication
b)
Authorisation
c)
Data Conversion
d)
Compression
e)
HTTPS
61.
Which best describes what authentication is?
a)
Authentication is the process of identifying someone's identity by assuring that the person is the same as what he is claiming for.
b)
Authentication is the process of granting someone to do something. It means it is a way to check if the user has permission to use a resource or not.
62.
Which best describes what authorisation is?
a)
Authorisation is the process of granting someone to do something. It means it is a way to check if the user has permission to use a resource or not.
b)
Authorisation is the process of identifying someone's identity by assuring that the person is the same as what he is claiming for.
63.
What is the 6th layer of the OSI model?
a)
Presentation
b)
Session
c)
Application
64.
What is the purpose of the Presentation Layer?
a)
A Presentation layer is mainly concerned with the syntax and semantics of the information exchanged between the two systems.
b)
The Presentation layer is used to establish, maintain and synchronises the interaction between communicating devices.
c)
A Presentation layer serves as a window for users and application processes to access network service.
65.
Which 3 services are included in the Presentation layer?
a)
Data conversion
b)
Encryption and Decryption
c)
Compression
d)
Authentication
e)
Network Virtual Terminal
66.
What is the 7th layer of the OSI model?
a)
Presentation
b)
Session
c)
Application
67.
What is the purpose of the Application Layer?
a)
An Application layer serves as a window for users and application processes to access network service.
b)
The Application layer is used to establish, maintain and synchronises the interaction between communicating devices.
c)
An Application layer is mainly concerned with the syntax and semantics of the information exchanged between the two systems.
68.
Which 3 protocols are used in the Application layer?
a)
HTTPS
b)
SSH
c)
DNS
d)
TLS
e)
SAP
69.
What does HTTPS stand for?
a)
Hypertext Transfer Protocol Secure
b)
Hypertext Transfer Protocol Service
c)
Hypertext Transport Protocol Service
70.
What does DNS stand for?
a)
Domain Name System
b)
Dominant Name System
c)
Domain Name Service
d)
Domain Naming Service
71.
What does a DNS server do?
a)
DNS server translates domain names to IP addresses so browsers can load internet resources.
b)
DNS server translates IP addresses to domain names so browsers can load internet resources.
72.
What does DHCP stand for?
a)
Dynamic Host Configuration Protocol
b)
Dynamic Host Control Protocol
c)
Dynamic Host Control Process
d)
Dynamic Host Configuration Process
73.
What does a DHCP server do?
a)
DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network, so that they can communicate with devices.
b)
DHCP server statically assigns an IP address and other network configuration parameters to each device on a network, so that they can communicate with devices.
c)
DHCP server dynamically assigns an IP address and other network configuration parameters to one device on a network, so that they can communicate with devices.
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