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wired and wireless
networks
- layers
- TCP/IP
- Application
- Network applications
operate on this level
- Network applications
operate on this level
- Link
- Hardware operates
on this level
- Hardware operates
on this level
- Transport
- Links hosts together
- Links hosts together
- Network
- Routers operate
on this layer
- Routers operate
on this layer
- TCP/IP
- Protocols
- Hyper Text Transfer
Protocol (HTTP)
- HTTP is used to
access and recieve
web pages in the
form of Hyper Text
Markup Language
- HTTPS is the same yet the
data is encrypted
- It is used for bank websites
- It is used for bank websites
- HTTP is used to
access and recieve
web pages in the
form of Hyper Text
Markup Language
- File Transfer Protocol (FTP)
- Used to send and recieve files to and
from a remote server
- Used to send and recieve files to and
from a remote server
- POP and IMAP
- POP downloads the entire message to your computer and deletes
them from the server
- IMAP will only download the header and will
download the rest of the message when opened
however it will leave the file on the server
- POP downloads the entire message to your computer and deletes
them from the server
- SMTP (Simple Mail
Transfer Protocol)
- Protocol used for transferring e-mails
between servers
- Protocol used for transferring e-mails
between servers
- TCP/IP (see left)
- Hyper Text Transfer
Protocol (HTTP)
- The Internet
- The Internet is an interconnected
web of Wide Area Networks (WAN)
- A WAN is any network that uses third
party carriers (eg. Britsh Telecom)
- WANs usually spread over a
large geographical area
- A WAN is any network that uses third
party carriers (eg. Britsh Telecom)
- To avoid confusion between the 2.5 billion
connected devices the internet has adopted a
system called the IP address
- IP addresses act as home addresses for
devices
- IP addresses act as home addresses for
devices
- Packet Switching
- A file being sent is divided into 512 byte packets
- Each packet contains...
- Destination IP
- Origin IP
- Seqence number
- Number of Packets
- Error checking data
- Destination IP
- Each packet contains...
- A file being sent is divided into 512 byte packets
- Domain Name Server (DNS)
- DNS links a URL to an IP
address
- DNS links a URL to an IP
address
- The Internet is an interconnected
web of Wide Area Networks (WAN)
- Local Area
Networks
(LAN)
- LANs operate on a small
geographical area such as a single
site
- LANs can be wired or wireless
- All networks allow
computers to share files
- LANs can be wired or wireless
- LANs operate on a small
geographical area such as a single
site
- Wireless transmission
- Radio waves are used to transfer data wirelessly
usually 2.4 Ghz to 5.9Ghz
- Network Interface Cards (NICs) are
needed to access wireless networks
- Radio waves are used to transfer data wirelessly
usually 2.4 Ghz to 5.9Ghz
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