Linux - Study Mode

[#661] The physical layer of a network
Correct Answer

(C) defines the electrical characteristics of signals passed between the computer and communication devices

Explanation

Solution: The physical layer of a network is responsible for defining the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between communicating network systems. It deals with the transmission and reception of unstructured raw data over a physical medium. This layer defines details such as voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, and other similar attributes that are required to transfer the raw bit stream over a physical medium between devices. In summary, the physical layer primarily focuses on the physical aspects of transmitting data, such as electrical signals and mechanical connections.

[#662] What TCP/IP protocol is used for remote terminal connection service?
Correct Answer

(D) TELNET

Explanation

Solution: TELNET is the TCP/IP protocol used for remote terminal connection service. It allows users to log in remotely to another computer over a network and access its resources as if they were directly connected to that computer. TELNET operates on the application layer of the TCP/IP model and provides a virtual terminal connection, enabling users to execute commands on a remote system. It's important to note that TELNET transmits data, including passwords, in plain text, which makes it less secure compared to other remote access protocols like SSH (Secure Shell). So, in summary, for remote terminal connection service, the TCP/IP protocol used is TELNET .

[#663] How many networks and nodes per network, are allowed by the Class B network?
Correct Answer

(B) 16,384 networks and 65,534 nodes per network

Explanation

Solution: In Class B networks, the IP address space is divided into a large number of smaller networks, each with a moderate number of hosts. A Class B network uses a 16-bit network prefix, allowing for 65,534 possible host addresses per network. The total number of possible Class B networks is calculated as 214214, which equals 16,384 networks. So, in summary, for a Class B network, there are 16,384 networks and 65,534 nodes per network .

[#664] What service is used to translate domain names to IP addresses?
Correct Answer

(D) DNS

Explanation

Solution: DNS stands for Domain Name System, and it is the service used to translate domain names to IP addresses. DNS acts as a distributed database that maps human-readable domain names (like example.com) to IP addresses (like 192.0.2.1) that computers use to communicate with each other over a network. When you type a domain name into your web browser, your computer queries DNS servers to obtain the corresponding IP address, allowing it to connect to the appropriate web server. So, in summary, to translate domain names to IP addresses, you'd use the DNS service.

[#665] Which of the following command is used to create a Linux installation hoot floppy?
Correct Answer

(D) dd and rawrite

Explanation

Solution: To create a Linux installation boot floppy, you would typically use the dd command on Unix-like systems or rawrite command on Windows systems. The dd command is a versatile utility used for copying and converting files. In this case, it can be used to copy the installation image to the floppy disk. On Windows systems, rawrite is a command-line tool used to write raw disk images to removable media such as floppy disks. So, in summary, to create a Linux installation boot floppy, you would use dd on Unix-like systems and rawrite on Windows systems.