1. What is a Link?
A link refers to the connectivity between tow devices. It includes the type of cables and protocols used to order for one device to be able to communicate with the other.
2. What are the layers of the OSI reference model?
There are 7 OSI layers:
1. Physical Layer,
2. Data Link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer
3. What is backbone network?
A backbone network is a centralized infrastructure that is designed to distribute different routes and data to various networks. It also handles management of bandwidth and various channels.
4. What is a LAN?
LAN is short for Local Area Network. It refers to the connection between computer and other network devices that are located within a small physical location.
5. What is a node?
A node refers to a point or joint where a connection takes place. It can computer or device that is part of a network. Two or more nodes are needed in order to form a network connection.
6. What are routers?
Routers can connect tow or more network segments. These are intelligent network devices that store information in its routing table such as paths, hopes and bottlenecks. With this info, they are able to determine the best path for data transfer. Routers operate at the OSI Network Layer.
7. What is point to point link?
It refers to a direct connection between tow computers on a network. A pint to point connection does not need any other network devices other than connecting a cable to the NIC cards of both computers.
8. What is anonymous FTP?
Anonymous FTP is a way of granting user access to files in public severs. Users that are allowed access to data in these servers do not need to identify themselves, but instead log in as an anonymous guest.
9. What is subnet mask?
A subnet mask is combined with an IP address in order to identify two parts: the extended notwork address and the host address. Like an IP address, a subnet mask is made up of 32 bits.
10. What is the maximum length allowed for a 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 down information into smaller manageable chunks before it is transmitted across the network. it is also in this process that the source and destination addresses are attached into the headers, along with parity checks.
12. Describe Network Topology
Network Topology refers to the layout of a computer network. it shows how devices and cables are physical laid out, as well as how they connect to one and another.
13. Briefly describe NAT?
NAT is Network Address Translation. This is a protocol that provides a way for multiple computers on a common network to share single connection to the internet.
14. What is VPN?
VPN (Virtual Private Network) a technology that allows a secure tunnel to be created across a network such as the internet.
EX: VPNs allow your to establish a secure dial-up connection to a remote server
15. What is RIP?
RIP means Routing Information Protocol is used by router to send data from one network to another. It efficiently manages routing data by broadcasting its routing table to all other routers within the network. it determines the network distance in units of hopes.
16. What is the job of ne Network layer under the OSI model?
The network layer is responsible for data routing, packet switching and control of network congestion. Routers operate under this layer.
17. How does a network topology affect your decision in setting up a network?
Network topology dictates what media you must use to interconnect devices. It also serves as basis on what materials, connector and terminations that is applicable for the setup.
18. What is NIC?
NIC means Network Interface Card. This is a peripheral card that is attached to a PC in order to connect to a network. Every NIC has its own MAC address that identifies the PC on the network.
19. What are different ways of securing a computer network?
there are several ways to securing a computer network. Install reliable and updated anti-virus program on all computers. Make sure firewalls are setup and configured properly. user authentication will also help a lot. All of these combined would make a highly secured network.
20. What is the importance of the OSI Physical Layer?
Physical layer does the conversion from data bits to electrical signal, and vice versa. This is where network devices and cable types are considered and setup.
21. What is WAN?
WAN(Wide Area Network) It is an interconnection of computers and devices that are geographically dispersed. it connects networks that are located in different regions and countries.
22. How Many layers are there under TCP/IT?
Under the TCP/IP there are 4 layers
1. Network layer
2. Internet layer
3. Transport layer
4. Application layer.
23. What is a private IP Address?
Private IP addresses are assigned for use on intranets. These addresses are used for internal networks and are not routable on external public networks. These ensures that no conflicts are presents among internal networks while at the same time the same range of private IP addresses are reusable for multiple intranets since they do not see each other.
24. What are proxy servers and how to protect computer networks?
Proxy servers primarily prevent external users who identifying the IP addresses of an internal network. without knowledge of the correct IP address even the physical location of the network cannot be identified. Proxy servers can make a network virtually invisible to external users.
25. What is the function of the OSI session layer?
This layer provides the protocols and means for tow devices on the network to communicate with each other by holding a session. This includes setting up the session, managing information exchange during the session and tear-down process upon termination of the session.
26. What is the importance of implementing a Fault Tolerance System? Are there limitations?
A Fault tolerance system ensures continuous data availability. This is done by eliminating a single point of failure. However, this type of system would not be able to protect data in some cases, such as in accidental deletions.
27. What does 10Base-T mean?
10 refers to the data transfer rate, in this case is 10Mbps. The word base refers to base band, as oppose to broad band. T means twisted pair, which is the cable used for that network.
28. What is NOS?
NOS(Network Operating System) is specialized software whose main task is to provide network connectivity to a computer in order for it to be able to communicate with other computer and connected devices.
29. what is DoS?
DoS (Denial-of-Service attack) is an attempt ot prevent users form being able to access the internet or any other network services. such attacks may come in different forms and are done by a group of perpetrators. one common method of doing this is to overload the system server so it cannot anymore process legitimate traffic and will be forced to reset.
30. what is OSI and what role does it play in computer networks?
OSI(Open Systems Interconnect) serves as a reference model for data communication. it is made up of 7 layers, with each layer defining a particular aspect on how network devices connect and communicate with one another. one layer may deal with the physical media used, while another layer dictates how data is actually transmitted across the network.
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