Understanding Local Area Networking Flashcards
What is a LAN?
A local area network (LAN) is a group of two or more computers that exchange data. Usually confined to a small area, like an office building.
Why do organisations need LAN’s?
Sharing: of files, databases and media
Communication: email, instant message and VoIP
Money: increase of efficiency
What is Network Documentation?
Any information that helps describe, define and explain how computers are connected in a physical and logical way.
What does Serial data transfer mean?
The transfer of data one bit at a time. A single transfer via a single-bit stream
What things happen when data is sent over the network?
The data is packaged by the OS into a packet.
The packet is then placed inside a frame by the network adaptor.
The network adaptor then breaks down the frame into a serial data stream that is sent over the cables via a single-bit stream.
The receiving PC recreates the frame of data from the single-bit stream and then subsequently strips the frame so only the packet remains.
The packet is then opened by the receiving OS and can now be accessed by a user.
What is Ethernet?
A set of rules that govern the transmission of data between network adaptors and various central connecting devices.
What common types of Ethernet are there?
- 3u (Fast Ethernet) 100Mbps
802. 3ab (Gigabit Ethernet)
What advantages does switching have?
Only sends unicast traffic (data sent to one host only)
Reduce network traffic
Reduced packet loss and duplication.
What is another name for data transfer rate?
Bit rate
What are the differences between Mbps and MB?
Mpbs - bits per second (speed)
MB - bytes of storage (size)
Why is an IP address important?
It defines each host/computer
What is a subnet mask?
A group of four numbers that define what IP network the host/computer is a member of.
Could a computer with the subnet mask of 255.255.0.0 communicate with a computer with a subnet mask of 255.255.255.0?
No, because the computers that are trying to communicate need to have the same subnet mask so they can recognise each other through the network.
How does a computer see an IP Address?
As a 32-bit dotted-decimal number (Binary)
How many bytes/octects does an IP have?
Four.
e.x. 192.168.50.251
Bytes/Octets - 1 . 2 . 3 . 4