Networks Flashcards
What are the advantages and disadvantages of the Bus Topology?
The advantages of a Bus topology is that it doesn’t require any additional hardware to set up.
The disadvantages of a Bus topology is if a cable files the entire network gets disconnected, As traffic increases performance decreases, all computers can see the data transmission.
What are the advantages and disadvantages of the Star Topology?
The advantage of a Star topology is that it is consistent even if the network is
being heavily used, if one cable fails only that device is affected, transmits data faster so it gives better performance than a bus topology, It’s easy to add new stations and there is no collision data.
The disadvantages are expensive due to a switch and cabling and that if the central switch fails, the rest of the network fails.
What are the advantages and disadvantages of Mesh Topology?
The advantages of a mesh topology is that there is no cabling cost. As nodes increase, the reliability and speed of the network becomes better. Nodes automatically get incorporated, It’s faster since nodes don’t go through a central switch.
The disadvantage of a mesh topology is that you have to purchase a device with wireless capabilities and maintaining the network is difficult.
What is a protocol?
A protocol is a set of rules defining two devices that communicate with each other.
What are the four layers of the TCP/IP protocol stack?
The four layer of the TCP/IP protocol stack are: Application Transport Network Link
What does the Application Layer do?
The application layer:
Uses high-level protocols to set an agreed standard between communication end-points. E.g. what protocols to use.
Does not determine how the data is transferred but the specific rules on how the data should be sent.
What does the Transport Layer do?
The Transport Layer:
Uses Transmission Control Protocol to establish end-to-end connection with the recipient’s computer.
Splits them into packets and numbers them.
At the receiving end the layer confirms that packets have been received and requests any missing packets.
What does the Internet Layer do?
Internet Layer:
Uses the Internet Protocol(IP) to address packets with the source and destination IP addresses.
The router then forwards each packet toward a socket.
What does the Link Layer do?
Link Layer
The link layer operates across a physical connection
Adds the MAC address of the physical NIC that packets should be sent based on the destination IP address address
MAC addresses change with each hop.
What is a firewall?
A Firewall is designed to prevent unauthorised access to a network, and restricts traffic entering and leaving the server.
What is Encryption
Encryption is a way of keeping data secure when transmitting over the internet.
What is a Switch?
A switch is used to direct the flow of data across the network.
What is Router
A Router is used to connect two or more networks together.
What is a Gateways
Gateways are used when two networks with different protocols want to communicate, it translates the protocols so both networks can have the same protocols.
What is a Client-Server? What are the advantages and disadvantages?
A client-Server has one central server which provides data to a number of networked devices.
The advantages of a client-server is that it is more secure, central backups eliminate the need for client backups, and sharing data and resources between clients .
