1) What is a WAN?
WAN is Wide Area Network. It is the interconnection of geographically dispersed computers and equipment. It connects networks in different regions and countries.
2) What is the importance of the OSI physical layer?
The physical layer converts data bits to electrical signals, and vice versa. This is the consideration and setting of network equipment and cable type.
3) How many layers are there under TCP/IP?
There are four layers: network layer, internet layer, transport layer and application layer.
4) What are proxy servers and how do they protect computer networks?
The proxy server mainly prevents external users from identifying the IP address of the internal network. If you do not know the correct IP address, or even the physical location of the network, the proxy server can make the network invisible to external users.
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5) What are the functions of the OSI session layer?
This layer provides protocols and methods for two devices on the network to communicate with each other by holding sessions. This includes setting up the session, managing the information exchange during the session, and terminating the session.
6) What is the importance of implementing a fault-tolerant system? Limited?
Fault tolerant systems ensure continuous data availability. This is achieved by eliminating single points of failure. However, in some cases, this type of system cannot protect data, such as accidental deletion.
7) What does 10Base-T mean?
“10” refers to the data transmission rate, which is 10Mbps in this case. “Base” refers to baseband. “T” refers to twisted pair, which is the cable used for the network.
8) What is a private IP address?
Dedicated IP addresses are assigned for the intranet. These addresses are used for internal networks and cannot be routed on external public networks. These ensure that there is no conflict between internal networks, and the range of private IP addresses can also be reused for multiple internal networks because they do not “see” each other.
9) What is NOS?
The NOS (Network Operating System) is a special software whose main task is to provide the computer with a network connection so that it can communicate with other computers and connected devices.
10) What is DoS?
A DoS (Denial of Service) attack is an attempt to prevent users from accessing the Internet or any other network service. This attack may take different forms, consisting of a group of permanents. A common way to do this is to overload the system server so that it can no longer handle legitimate traffic and will be forced to reset.
11) What is OSI and what role does it play in the computer network?
OSI (Open Systems Interconnection) is a reference model for data communication. It consists of seven layers, each of which defines specific aspects of how network devices connect and communicate with each other. One layer can handle the physical media used, while the other layer indicates how data is actually transmitted over the network.
