Popularize 100 basic network knowledge, see half a network master!

August 8, 2022

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1) What is a link?

A link is a connection between two devices. It includes cable types and protocols for one device to be able to communicate with another device.


2) What are the layers of the OSI reference model?

There are 7 OSI layers: physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer.


3) What is the backbone network?

Backbone networks are centralized infrastructure designed to distribute different routes and data to various networks. It also handles bandwidth management and various channels.


4) What is a LAN?

LAN is an abbreviation for Local Area Network. It refers to the connection between a computer and other network devices located in a small physical location.


5) What is a node?

A node is a point where a connection occurs. It can be a computer or device that is part of a network. To form a network connection, two or more nodes are required.


6) What is a router?

A router can connect two or more network segments. These are intelligent network devices that store information in their routing tables, such as paths, hop counts, etc. Armed with this information, they can determine the best path for data transfer. Routers operate at the OSI network layer.


7) What is a peer-to-peer link?

It refers to a direct connection between two computers on a network. A point-to-point connection does not require any other network equipment other than the NIC cards that connect the cable to the two computers.


8) What is anonymous FTP?

Anonymous FTP is a way of granting users access to files on a public server. Users who are allowed to access data in these servers do not need to identify themselves, but log in as anonymous guests.


9) What is the subnet mask?

The subnet mask is combined with the IP address to identify two parts: the extended network address and the host address. Like IP addresses, subnet masks consist of 32 bits.


10) What is the maximum allowed length of UTP cable?

A single segment of UTP cable has an allowable length of 90 to 100 meters. This limitation can be overcome by using repeaters and switches


11) What is data encapsulation?

Data encapsulation is the process of breaking information into smaller manageable chunks before transmitting it over a network. During this process, the source and destination addresses are appended to the header along with parity.


12) Describe the network topology

Network topology refers to the layout of a computer network. It shows the physical layout of devices and cables, and how they connect to each other.


13) What is a VPN?

VPN means Virtual Private Network, a technology that allows the creation of a secure tunnel through a network such as the Internet.

For example, a VPN allows you to establish a secure dial-up connection to a remote server.


14) Briefly describe NAT.

NAT is Network Address Translation. A protocol that provides a way for multiple computers on a public network to share a single connection to the Internet.


15) What is the job of the network layer under the OSI reference model?

The network layer is responsible for data routing, packet switching and network congestion control. Routers operate below this layer.


16) How does the network topology affect your decisions when building your network?

Network topology determines what medium must be used to interconnect devices. It also serves as the basis for suitable materials, connectors and terminations for the setup.


17) What is RIP?

RIP, short for Routing Information Protocol, is used by routers to send data from one network to another.

It efficiently manages routing data by broadcasting its routing table to all other routers in the network. It determines network distance in hops.


18) What are the different ways to secure computer networks?

There are several ways to do this. Install a reliable and updated antivirus program on all computers. Make sure the firewall is set up and configured correctly. User authentication will also help a lot. All these combinations will form a highly secure network.


19) What is a NIC?

NIC is short for Network Interface Card (Network Card). This is connected to the PC to connect to the network Shenbei. Each NIC has its own MAC address that identifies a PC on the network.


20) What is WAN?

WAN stands for Wide Area Network. It is the interconnection of geographically dispersed computers and devices. It connects networks located in different regions and countries.


21) What is the importance of the OSI physical layer?

The physical layer performs the conversion from data bits to electrical signals and vice versa. This is a consideration and setup for network equipment and cable types.


22) How many layers are there under TCP/IP?

There are four layers: network layer, internet layer, transport layer and application layer.


23) What are proxy servers and how do they protect computer networks?

Proxy servers primarily prevent external users from identifying the IP address of the internal network. Without knowing the correct IP address or even identifying the physical location of the network. A proxy server can make the network virtually invisible to outside users.


24) What is the function 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 exchange of information during the session, and the disassociation process when the session is terminated.


25) What is the importance of implementing a fault tolerant system? Is it limited?

A fault-tolerant system ensures continuous data availability. This is achieved by eliminating single points of failure. However, in some cases, this type of system will fail to protect data, such as accidental deletion.


26) What does 10Base-T mean?

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