Networks Flashcards
What is a LAN ?
A network that has computer systems situated geographically close together
The network infrastructure is is owned by the network owner
What is a WAN?
A network that has computer systems situated geographically distant to each other
WAN often use third party channels
What is a router and its features ?
A router is used to transfer data packets between networks
.Receives data packets
.Sends data packets
.Stores IP address of each computer connected to the network
. Routing table to calculate the quickest and shortest route to transfer data
What is a switch ?
Connects devices together on a LAN
.Receives data packets
.Forwards data directly to its destination
.Reads destination address in the packets header
Step 1 How to display a web page ?
- Display name is typed into the address bar of the browser
Step 2 on how to display a webpage ?
- A query is sent to the local DNS server to find the corresponding IP address of domain name
Step 3 of how to display a webpage ?
.Local DNS server checks if it holds the IP address corresponding to domain name
.If found it passes the IP address to the browser
Step 4 on how to display a webpage ?
.Browser connects to the IP address of the server and accesses the website
What is a standard?
Rules that allow computer systems to communicate across a network
What is a protocol ?
. A set of rules that allow devices on a network communicate to each other
What is the 1st layer ?
Ethernet sets out the format of data packets handles transmission errors and passes data to the physical layer
What is the 2nd layer ( Network)?
Ip is responsible for addressing and routing data packets . Optimal route is calculated in this layer .
What is the 3rd layer (Transport)?
TCP breaks down data into data packets . This ensures that data is sent and received in the correct order with minimal errors .
What is the final layer( application)
Allows humans and software applications to use the network .
