Identify three network hardware devices that can be used to support a wifi connection - WAP, Switchm Hub, Router, Modem, State two advantages of connecting to a LAN - Can share hardware like printers, internet connection and files, Describe the difference between IP addresses and MAC addresses - IP addresses can be changed whereas a MAC address can not be . IP address is denary whereas a MAC address is written in HEX, Give two advantages of sing DNS server to convert website addresses - A website address is easier to remember than an IP address, a connection to one DNS server means that you can access all addresses on all DNS servers, What's the difference between a LAN and WAN - WAN is over a large geographical area and uses external harware. LAN is limited to a small geographical area and uses it's own cables., How can a LAN be used to monitor employees - Record log in times, audit printing and view screens., What is meant by a protocol - A set of rules of how computers should communicate on a network, State an advantage of a mesh network over a star - Mesh is self healing/ has no point of failure. Mesh can also be expensive to install and has redundant connections, Explain how packes switching is used to send data across the Internet - The files are split into packets, each has a fixed size, It is given a header including the IP address and packet number. The packet finds it's way across the network and when it reaches it's destination it is re-ordered, Give three functions of the server in a network - Provide file to other computers on the network, make the printer accessible to all, store, deliver and send emails. Also controls access to the Internet, Explain what is meant by a peer to peer network - All computers have equal status and share data between each other, State a factor affecting the performance of a network - Bandwidth, Latenchy , Error rate and retransmission rate, number of people of the network and interference , Name two types of cables - Copper cable, optic fibre and Cat 5/6, Why is a NIC needed in a network - A NIC is needed to access a network and provides a unique MAC address to which to send packets, State two factors that will affect the performance of a WiFi signal - Physical objects, other electronic devices and neighbouring networks using overlapping channels, What is meant by the cloud - A remote server used to host company files and is accessible via the Internet, What is the difference between POP and IMAP - POP will download the entire message and delete it from the server. IMAP will download the message header and leave the message on the server. , State two advantages of using the cloud - Additional storage, Allows people to work from anywhere collaboratively, environmentally friendly, third party provides backup and security, What are the advantages of a client server model over a peer to peer model - Data can be backed up centrally rather than on each indivisual computer, security is improved as data is held in one location rather than spread across the network. , What four items would you expect in a packet header - IP address of sender and receiver, sequence number of packet, the number of packets in the communication and error checking data, State a piece of hardware required to connect you to an external network - router, What's an advantage and disadvantage of changing to a wired network - Faster than wireless, can transfer more bandwidth and more reliable. Disadvantage is it is less flexible and more expensive, Describe the difference between a URL and IP address - URL uses words and IP uses numbers. URL has to be converted into the IP address with a DNS, What's the role of a server and client - A server deals with request, stores files and a client makes requests, What can impact the Wifi performance - number of people on the network will impact the data that will have to be shared. The more data transmitted the more collisions that can take place. Also interference from physical objects and electrical devices, What is ethernet and how does it support transmission of data - Is a protocol for wired transmission, Apart from cables and the router name two other pieces of hardware needed for a network - NIC, WAP, Server, Hub, Switch, What is the tasks performed by the router - Directs packets across a network, Designates IP addresses to network nodes, receives packets from a network and connects different netwr, What's the difference between IMAP and SMTP - IMAP retrieves emails from the server SMTP sends emails , What protocol us used if a customer wants to securely log into her bank online - HTTPS, What protocol is used if a use wants to transfer a file to his friends computer - FTP, Describe the role of a switch in a network - To connect devices together, receives data, uses MAC addresses to connect to it and generates a list of devices connected to it.,

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