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WorksheetsKiến thức về mạng và bảo mật
Total questions: 57
Worksheet time: 34mins
In peer-to-peer (P2P) network architecture, which of the following characteristics is correct?
Peers do not need to connect to each other.
Peers can frequently change their IP addresses.
Peers cannot communicate directly with each other.
Peers can only use the HTTP protocol.
Which of the following statements is incorrect?
Active Directory Certificate Services can be used to secure Web Server on Windows Server 2016.
Active Directory OU (organizational unit) is a container used to organize objects in a domain into logical management groups.
View CPU information of the machine through the command cat /proc/info on CentOS 9 operating system.
Vi is an editor available on Unix/Linux operating systems. Vi is often used to create and edit configuration files on Linux.
Which of the following statements is correct?
Bluetooth network covers a wide area, extending for tens of kilometers.
The main function of Routers is to store and manage network applications.
HTTP is a state protocol for sending emails.
Wireless LAN (WiFi) has data transmission speeds from 10 to hundreds of Mbps and operates within a few dozen meters.
What does RFC (Request for Comments) published by IETF (Internet Engineering Task Force) refer to?
Standards and technical guidelines that are publicly available to support the development and use of the Internet.
Regulations on security and network resource management.
Protocols and software used to maintain the operation of the Internet.
Policies and regulations of international organizations related to the use of the Internet.
What is correct when talking about access rights to resources on Linux Server?
Read permission allows reading the content of files and viewing the contents of directories using the ls command.
Execute permission only allows executing programs. This permission does not apply to directories.
Execute the ls command to view the display of access rights on directories and files.
All A, B, C are correct.
How do delay and packet loss occur in the network?
How does delay and packet loss occur in a network?
When packets wait to be transmitted, they are queued in the router's buffer.
The queue length increases when the incoming speed temporarily exceeds the outgoing bandwidth.
Packet loss occurs when the memory allocated for packets in the queue is full.
All of A, B, C are correct
Which statement is correct when talking about Socket in computer networks?
Each socket is identified by a pair of IP addresses and port numbers, and they act as a bridge to send and receive data between processes on network devices.
A service that stores data on the server.
A protocol to protect data during transmission.
Regulations on security and network resource management.
Which network protocol provides a mechanism for traffic control to prevent network congestion?
UDP
TCP
SMTP
FTP
The characteristic of full-duplex mode in communication in computer networks allows:
To transmit data in one direction only.
To transmit data simultaneously in both directions.
To receive data only.
Cannot transmit data.
Which of the following statements is incorrect?
TCP is a network protocol that provides a mechanism for traffic control to prevent network congestion.
POP3 is a protocol for storing email on the server, while IMAP is a protocol for synchronizing email across multiple devices.
Cookies are often used to compress images and files to speed up page loading.
Router is responsible for processing the IP header and deciding to forward packets to the destination.
Which protocol provides connectionless and unreliable data transmission?
TCP
UDP
HTTP
FTP
Where is the DHCP Acknowledge (ACK) message sent?
To the broadcast address of the network.
To all hosts on the network.
To the original DHCP server's IP address.
To the MAC address of the requesting host.
Considering the network 172.16.10.0/24, borrowing 3 bits. Which of the following statements is incorrect?
The number of subnets created is 8 subnets.
The new subnet mask is 255.255.255.224
In the network 172.16.10.0/24, which statement is incorrect?
The number of subnets created is 8 subnets.
The new subnet mask is 255.255.255.224.
There are 5 bits left for the host part.
The number of hosts per subnet is 30 hosts.
What benefit does DHCP provide for network management?
Automatic routing.
Distributing SSL certificates.
Distributing dynamic IP addresses.
Controlling network access.
Which directory in Linux contains essential executable programs for basic system administration tasks?
/bin
/etc
/home
/lib
A computer is configured to use the DNS server 8.8.8.8 as its local DNS server. What will happen first when this computer accesses the website 'www.example.com'?
The computer will send a DNS query directly to the root DNS server.
The computer will check the local DNS cache to see if it has the IP address of 'www.example.com'.
The computer will send a DNS query to its Internet Service Provider (ISP).
The computer will directly access the IP address 'www.example.com' without querying DNS.
What does a private IPv4 address help mitigate?
Attacks from users within the internal network.
Attacks from outside the Internet.
Both A and B are correct.
Both A and B are incorrect.
Which statement is incorrect?
Layer 2 switches update the MAC address table while routers update the routing table.
ARP (Address Resolution Protocol) maps IP addresses to MAC addresses of devices.
The connection from switch to host is of the Point-to-point link type.
Router and switch devices usually operate in Multicasting mode.
What is the main purpose of routing protocols in a network?
To ensure network security.
To ensure the availability of network services.
To find the optimal path between source and destination.
All A, B, C are incorrect.
What makes routing protocols one of the core factors in ensuring effective network service?
What makes routing protocol one of the core factors in ensuring effective network service?
Ability to optimize network bandwidth.
Deep integration into popular network applications like web and video streaming.
Ensures that scalable networks can be managed.
All of A, B, C are correct.
What is the main purpose of network management?
Optimize network bandwidth
Ensure network security
Achieve network performance and quality of service
Install network management software
What characteristics are classic Ethernet networks like 10BASE5 and 10BASE2 known for?
Only allow two nodes to transmit data.
Use shared transmission channels.
Controlled by a central device.
Easily detect and correct errors.
In a star topology network, what type of connection is from switch to host?
Broadcast link
Point-to-point link
Multipoint link
Wireless link
Before transmitting data, what does a device using CSMA/CD do?
Check if the data has been encoded.
Check if the transmission channel is available.
Check if the IP address has been allocated.
Check if the network is connected to the Internet.
The portability of a MAC address compared to an IP address?
A MAC address can move between networks without reconfiguration.
A MAC address depends on the network the device is connected to.
A MAC address can change without needing to be reset.
A MAC address must have an accompanying IP address.
Which command provides detailed information about active network interfaces (including IP address, MAC address, operational status, and other configurations) in CentOS?
ifconfig
netstat
ip addr
route
What information does the ARP table on each device in a LAN contain?
List of global IP addresses.
Mapping between IP addresses and MAC addresses of other devices on the same LAN.
List of MAC addresses.
What information does each device in the LAN contain?
A list of global IP addresses.
Mapping between IP addresses and MAC addresses of other devices on the same LAN.
A list of MAC addresses of routers connecting the network.
TTL (Time To Live) of ARP packets.
What forwarding method does an Ethernet Switch use when receiving and forwarding frames?
Cut-through
Store-and-forward
Multicast forwarding
Segmentation forwarding
What are the main functions of ADUC (Active Directory Users and Computers) in Windows Server?
Create and manage user accounts, reset passwords, and set account properties.
Manage computers in the network.
Set up email accounts for users.
Control and monitor network services.
What is the purpose of the usermod -G command in CentOS 9?
Change the primary group of a user.
Add a user to additional groups.
Remove a user from a group.
Change a user's password.
Which protocol is used to add VLAN header information to Ethernet frames?
802.1X
802.11ac
802.3af
802.1Q
What is the purpose of Load balancing in a data center network?
Distribute workloads evenly across servers.
Increase internet connection speed.
Optimize network traffic.
Manage network bandwidth.
What does ARP (Address Resolution Protocol) do to ensure that packets are correctly addressed and sent in the LAN?
Check that packets contain the correct IP address.
Update the IP address table of each device.
Help establish connections between different devices in the LAN.
Map IP addresses to MAC addresses of devices.
In which frequency bands does WiFi primarily operate?
1 GHz
2 GHz
2.4 GHz
3 GHz
Which statement is correct regarding Active Directory on Windows Server?
Active Directory on Windows Server is used in a peer-to-peer network model.
Active Directory is only available on Windows Server 2008 and earlier.
What is Active Directory on Windows Server?
Active Directory on Windows Server is used in a peer-to-peer network model
Active Directory is only available on Windows Server 2008 and later
The core of the logical organizational architecture in Active Directory is Domain, which stores millions of objects
All A, B, C are correct
Which command is used to change the access rights of a file or directory in the Linux system?
mv
chmod
ls
cp
What is the typical range of WiFi networks?
From a few meters to hundreds of meters
Hundreds of meters to thousands of meters
A few kilometers
Under 10 meters
To move to the directory /home/user/Documents, which command is used in Linux?
cd /home/user/Documents
ls /home/user/Documents
mkdir /home/user/Documents
cp /home/user/Documents
What is the main purpose of Encryption in network security?
Prevent denial of service (DoS) attacks
Protect sensitive information from unauthorized access
Verify the identity of communicating parties
Protect against information modification during transmission
What features and functions does ADUC (Active Directory Users and Computers) provide to manage security groups and distribution groups in Active Directory?
Only create new groups
Only manage members of groups
Create, manage, and set properties of groups
Only view the list of available groups
Which tool is used to create and manage Group Policy in a Windows Server environment?
Active Directory Users and Computers (ADUC)
Server Manager
Group Policy Management Console (GPMC)
Windows PowerShell
Which command is used to copy files or directories in the Linux system?
mv
cp
ls
cat
The technology primarily used in mobile networks such as 4G and 5G:
Bluetooth
NFC
LTE
Zigbee
To configure a network interface with a static IP address in CentOS, which command can be used?
nmtui
ifconfig
ip addr add
dhc
What is G and 5G?
Bluetooth
NFC
LTE
Zigbee
To configure a network interface with a static IP address in CentOS, which command can be used?
nmtui
ifconfig
ip addr add
dhclient
Which of the following statements is incorrect?
An interface is a dedicated port on a network device connecting to individual networks.
A LAN has a wide geographical range often related to a telecommunications service provider.
Wireless transmission encrypts data using waves from the electromagnetic spectrum.
Copper cables encode data into electrical pulses.
For the IPv4 address 172.16.15.130/28, what will be the address of the first subnet?
172.16.15.1 – 172.16.15.14
172.16.15.1 – 172.16.15.30
172.16.15.1 – 172.16.15.62
172.16.15.1 – 172.16.15.126
What is the main function of the TCP/IP protocol in the Internet infrastructure?
Forwarding data between computers in the same LAN.
Controlling the sending and receiving of data packets on the Internet.
Managing and distributing Internet services to end users.
Ensuring safety and security for Internet connections.
Which command is used to view detailed information about the CPU in Linux?
cpuinfo
lshw
procinfo
cat /proc/cpuinfo
During the use of the Active Directory Installation Wizard, an error message appears preventing the upgrade of the server to a Domain Controller in the Windows Server 2016 system. What could be the cause?
The TCP/IP configuration on the server is incorrect.
There is no DNS server running Windows Server 2016 on the network.
The domain has reached the maximum number of Domain Controllers.
All A, B, C are incorrect.
The architecture of a Linux operating system consists of the following components:
Kernel, Shell, applications
Physical, Shell, Core
Kernel, Shell, compilers
Sh, Bash, applications
